Small but perfectly formed JBL home cinema

[JBL 4645]

http://www.avsforum.com/

http://www.avsforum.com/avs-vb/forumdisplay.php?f=3

Thomas

Looks like Captain Nemo’s $62,500 leagues over the budget that, I don’t have. :D

[JBL 4645]

http://www.youtube.com/watch?v=ShCcREXE1sg&feature=player_embedded

[JBL 4645]

http://www.youtube.com/watch?v=KUTY80QbQFM&feature=player_embedded


http://www.youtube.com/watch?v=VL6b-SQD2qI

I’ve managed to elevate some of the loudness of left/right with chapter 13, but the Hans Zimmer score is still intrusive offending at masking centre channel.

Its not the best Dolby mix I mean dtsHD master audio mix of 2011. In normal Joe’s home cinema they wouldn’t know that the centre had some rare soft subtle moments as they’d be drowned out by Hans Zimmer!

The point of best sound is what? Drowning audiences in NOISE because that is not sound the use of LCR is poorly mixed. They should have mixed this in monaural because its pain the ass to short the levels out, with a bit of audio limiting to reduce Zimmer’s noisy score!

I’ve had to cut the levels on the left and right amps LF and HF. Now if I had matching EQ Technics SH-8055 I could monitor the frequency response of each LCR at the same time.

I could feed left and centre into the SH-8055 to monitor some scenes to get an idea of what is happening.

They’re have been far better Dolby film mixes of the past which have won for best sound, but Inception is taking up my time to sort this out because I like to hear everything that is on the LCRS full spectrum not have, my ears drowned out.

I though Alien (1979) Heat (1995) and The Fast and Furious (2001) was complex Inception (2010) takes the biscuit!

I’ve added some HP to left/right and reduced the level as most of the midrange sounds are aggressively masking centre but, at some point centre will mask the left/right! SIGH

Why do, mixes mix to these silly levels? A straightforward monaural mix would have been far easier for us to listen too.

I’m having lighting issues with camera as it doesn’t like high brightness/contrast.

This can take all day long to suss this out. I can’t use the dynamicEQ as several EQ bands on the LCR LF/HF have taken up percentage space and I’m down to 9% not enough, hmm, maybe I can trade off a few EQ bands that might give me enough for the ABC dynamicEQ thou that’s going to eat-up percentage space in next to know time. SIGH

Also the levels if I reduce the fade level and levels fall below -24db the audio limiters won’t kick in.

This is going to take me all day if not the whole weekend to suss this out.

I should get myself around to buying x2 SRS MyVolume for the LCR maybe they can sort the mess out!

I’m also monitoring while looking and listen to the output levels of LCR on channels on the DCX2496

1 left LF
2 left HF

3 centre LF
4 centre HF

5 right LF
6 right HF

[JBL 4645]

I think I’m making some (small progress) after going back and forth many times, over listening and re-listening while looking at the DCX2496 but I can’t see the tiny differences in the frequency response and that is what counts the most. Certain frequencies will make it very hard listen to the softer sounds over LCR.

(Thinking out) I guessing I might have to set a standard of some kind, a kinder format setting for different films because I don’t know what mess its going to make of Indiana Jones and the Last Crusade with current settings. Like, I said a “format setting”.

I monitored on headphones the scene son and farther in chapter 13, and I can only pick out a few wet sounds of the son sobbing and dialogue “father” but the softer ambient sounds are totally, back of the box! That’s a CB term when the voice is so distant faint sounding amongst the radio (noise or hash).

Right at the very end of Non, Je Ne Regrette Rien the centre fades right out, but not before a musical echo upper mid sound kicks in then centre fades to mute, while the sound pans out to left to right and onto the stereo surrounds with Edith Piaf.

Before the left and right front was grossly TOO HIGH I can now listen to Non, Je Ne Regrette Rien sounding on the centre rather than left and right drowning it out.


http://www.youtube.com/watch?v=-lW1g2T0Kv8

[JBL 4645]

http://www.youtube.com/watch?v=jJwwBUx6J3Y&feature=player_embedded

[JBL 4645]

http://www.youtube.com/watch?v=LE88ifrtp-U&feature=player_embedded

[JBL 4645]

http://www.youtube.com/watch?v=pdncOokoKAE&feature=player_embedded

[JBL 4645]

http://www.youtube.com/watch?v=9RMhcgS740c&feature=player_embedded

The bluray dts 5.1 was originally recoded re-mixed in Dolby digital for the reissue of the shows. There is duel mono original mono mix that I would set to Dolby digital so it outputs to centre but the show sounds brilliant over 3” TV speaker from 36 years on Bush colour 26”.

[JBL 4645]

The Behringer GEQ3102 arrived early this week. It’s a discontented model replaced with the current new model that I’ll be buying next at least x4 over the coming few months FBQ3102.

EQ only set me back about £75.00 with P&P it has one piece of the plaster slider that covers the LED on the 20KHz band missing I can handle it that’s why its second/hand and in good nick as well the EQ bands all work including HP and LP filters -6db and -12db cut filter settings.

The EQ is only used on centre channel at the moment with no filters added as I’m waiting till I have BFQ3102 for left and right then I’ll reduce the EQ for LCR with 31 band 1/3 finally!

Channel 2 is being ran on the JBL sub with few bands here and there cut to give a smooth response on the RTA. I might have to buy a much, much later date Samson 31 RTA analyzer the cost is over £250 pounds!

I can then slowly dismantle the other EQ, I’ll keep them for some kinder use when needed?

[JBL 4645]

19” racks I should have got years ago but slowly with 19” rack pro equipment being installed I’d have to get a few racks as its looking rather untidily.

Since the JBL sub doesn’t have crossover filter its just passing out as normal to the amp. Hiss can be heard when amp level is at full so I cut back on the EQ filters to reduce the hiss, until I get around to buying a second DCX2496?

The low pass filter comes in handy on some LFE.1 mixes that are too damn loud! I EQ the sub with SPL placed with a few inches from the sub and did the same over LCR LF and set in filters that corresponded to the Technics frequency response on the RTA and made a few adjustments and left it alone.

I did the same for the subs placed behind the JBL control 5 I placed the SH-8055 onto sub left and right timed the level s it reads flat as possible.

The boom is a bit less annoying.

[JBL 4645]

http://www.youtube.com/watch?v=NYL_6o9fFXU&feature=player_embedded

The opening of Space Brain I thought it was taking the piss with Holst “Mars the bringer of war” while Eagle was being covered in wads of marshmallow. In space things can get sticky! :p the shows are starting to get a bit silly now. I think they’ve been in space too long…!

Is it me or does Alpha have hundreds of Eagles numbered Eagle 1? I think they lost at least 4 or 5 Eagle 1 in past This Episodes most of which was blown to bits before they could get off the pad by alien enemies.

Still the intro theme to the show rocks in JBL.:rockon1:

[JBL 4645]

I’m recreating something just for fun when I The Towering Inferno with Earthquake playing upstairs in Sensurround


http://www.youtube.com/watch?v=nK5EZiKBbaI&feature=player_embedded

When I saw The Towering Inferno at the cinema with my, dad around early February 1975 at Bournemouth ABC screen 2 with Earthquake playing in screen 1 in Sensurround. The Towering Inferno had an intermission sometime around 1hour 14min and after a minute of silence while sat in the back row my attention was drawn to low rumbling sound?

Oh that would be Earthquake playing in screen 1 in Sensurround. I saw the quad size posters outside and thought they looked great and thinking to myself I’ve got to see Earthquake late this week, which I did and saw it three more times afterwards.

Listening on the playback the LFE.1 sensurround rumble is a bit high it was still loud but a lesser level as there was concrete between the downstairs and upstairs cinema and at least 20 feet to the top of the ceiling. I was seated with my dad in the back row I think it’s more like 15 feet and as the floor slopes down to the front the height between floor and ceiling rises.

Also this was the last showing for the day so it would be evening time when my dad took me to see The Towering Inferno. Earthquake would have ended before The Towering Inferno, not sure about the film in screen 3 to left-side of screen 2 on the same floor level. Not sure what film title was playing in screen 3?? Not sure if they had the same issues with Earthquake upstairs as there can only be 1-foot between the wall?

[JBL 4645]

I just ordered the Behringer FBQ3102 should be wired up next to the GEQ3102 sometime around next-week, depending on postal delivery.

All I need for today is cheap soldering iron to make up some XLR leads. Oh, and some Cat Biscuits which I forget earlier on.

[JBL 4645]

Just brought a cheap soldering iron along with x3 XLR female plugs of ebay should take 4 to 6 days to arrive.

[JBL 4645]

I loaned out The Hurt Locker to best close friend last week. I get a call some 30mins later telling me it won’t play.
Last night I went around to pick-up and wanted to see for myself what the issue was. Oddly it wouldn’t play on the PS3. The main menu was stuttering like slow-motion. The main feature also exhibited the same issues as well as sound drop out?

I haven’t played the film since I brought and it played fine on the Phillips BDP3000. Since I have new Phillips BDP5000 it plays fine. I haven’t tried the Sony BDP-S5050 to see if it playback issues yet.

I like the use of dialogue panning it creates realism. I’d consider this a work of sound art now over Inception which was sound lousy. I still think The Hurt Locker should have had Dolby TrueHD since it was released in Dolby digital The output levels look a bit low on input on the DCX2496 even though some loud to mild levels chapters 6 to 7 the sniper in desert picking off the men one by one.

It’s my friends’ birthday in May so I’ll buy this for him as he wanted to see it.

[JBL 4645]

Soldering iron and XLR plugs arrived this morning. The postman was having a hard time stuffing the soldering iron though the letterbox, when I opened the door to receive my package.

Made x2 XLR leads up and re-soldered the broken wire on the SPL db metre that had come lose last week.

To hold the plug still I used a bit of blu-tak stuck to the desk with the XLR securely positioned for soldering.

I trimmed off the excess wire and I hope the leads work.

[JBL 4645]

I’ve made a few XLR leads up (with the new soldering iron that arrived in the post with some XLR plugs yesterday) for the FBQ3102 EQ and until that arrives I’ve re-patched the audio chain and now presently using the FBQ2496 temporarily until the FBQ3102 arrives in the post.

I’ve selected the 20 bands for channel 1 and 2 starting at
1) 39.9
2) 50.2
3) 63.2
4) 80.5
5) 100
6) 124
7) 160
8) 200
9) 251
10) 316
11) 399
12) 502
13) 632
14) 805
15) 1.000
16) 1.24
17) 1.60
18) 2.00
19) 2.51
20) 3.16

Q set per each band 0.333

Ran a wideband pink noise test using dts demo CD that’s supplied with Millennium 246 dts decoder

Look at the response on the technics SH-8055 adjusted the each LCR separately.

Ran chapter 7, from Casio Royale (2006) bluray PCM 6channel

I could run the FBQ2496 with its bands set for what I need by switching to a different frequency on the units dial.

Or use it loop and double the bands to 40 but the price goes up one FBQ2496 per LCRS and I’d need x2 for the surround channels.

Or triple quadruple it to 80 bands that would get the sound system sorted!


The FBQ2496 is on top of the DCX2496 the GEQ3102 is right at the very top. The other EQ Genxxa is running on 1 channel to cover the overhead surround.

The Marnatz EQ is ruining the left and right sidewall surrounds with a secondary EQ Technics SH-8050 running directly from the surround left and right before passing to the Harman Kardon AVP1a.This is I can tackle the other bands that the EQ don’t have also to trim down further to get the middle range to high end smoother so its not blitzing my hearing, I’m not that hard of hearing on the top end yet.

The Marantz 1030 is running the rear back surrounds and until I get new Behringer A500 to replace the Alesis RA300 I might use the A500 for the rear back surround and gradually revamp the sidewall surrounds and LCR and LFE.1.

Pioneer VSP-200 is acting as preamp and surround type, at the moment its set in (video mode) this so I can run the rear back surrounds as regular along with sidewall surrounds just like the cinema! Or switch to LD where it will work with the rear back surrounds in Dolby TrueHD 8channel. Has that boggled anyone head? LOL You may look but keep you’re hands on my sound system or you’ll have to answer to Mr. Sooty. D

Over the next few months I’ll install FBQ3102 for sidewall surrounds then rear back surrounds overhead surrounds and (additional left-centre / right-centre) I’ll start on amps later in the year and then get the older EQ stored away.

Racks! I like to get the clutter stored neatly away into racks. Still like to go for Samson SRK21 thou I have seen some rather neat racks on ebay (buy now) at cheap price range, I don’t want one with glass door it’s a bit more costly and often a bit taller and I have narrow height ceiling so stacking x2 Samson SRK21 on top each other will just clear the ceiling height and with x4 racks would get the entire sound system, sorted.

[JBL 4645]

I’m still waiting for the FBQ3102 to arrive or the suppler is waiting for the shipment from China could be another 2 weeks and it’s already been 2 weeks since I placed the order.

[JBL 4645]

I’m looking for an arrival by mid April or the suppler is looking at mid April for a large shipment.

I asked if they had the Behringer MULTICOM PRO-XL MDX4600 in stock and that too is out of stock and its on the ship! I need x3 of them, so looks like I have to patiently wait like everyone else.

[JBL 4645]

Cleaning the surrounds part of this, early mornings phase1 spring cleaning. Yes even the surrounds need a clean as dust and hair settles on top.

[JBL 4645]

I’m still waiting on the FBQ3102 to arrive in the UK! It should be sometime this week? Then another few days until it’s dispatched to me.

[JBL 4645]

Update seems like DV are still waiting as are hundreds of other Behringer customers that have other Behringer items on order. “4 months” it’s been 4 months since there’s been a good supply in the UK. I hope the shipment can supply and demand the UK towards the end of the year.

[JBL 4645]

Well the Behringer MDX4600 multicom-pro-XL arrived just past 7:00pm tonight. I was expecting this model to arrive since DV said they none in stock? I had to cancel the FBQ3102 until that arrives in the UK when??? sigh! I’ll re-order the FBQ3102 around early next month.

I’ll have to pop down the road in the morning to DJ and buy some male/female XLR plugs and some cable or can I cannibalize some cable that I already have, I think yes, unless the cable is cheap!

In the mean time I’m going see what she’s got! :)

[JBL 4645]

No that’s not a can of cream soda it’s a Fanta and its mine! :D

Well its nice warm day, for walk down to DJ to pick up a few plugs and hardly any male female XLR till around (mid next week). Only one male XLR that I got for free the phone plugs I paid for.

I’ll have to use the phone plugs for outputs from the MDX4600 with bare wires and poke them though the XLR female A and C inputs and place some sticky tape over the cable to hold it there until next week, when I can solder up some XLR leads.

[JBL 4645]

MDX4600 up and running now and I guess I’ll get down to some re-listening to Alien (1979) later on and maybe some HEAT (1995) and maybe some Fast and the Furious (2001) as that mix is complex!

Channels are assigned as
Ch1) left
Ch2) centre
Ch3) right
Ch4) sub / LFE.1

When running Dolby discrete digital 6track I normal switch the S/W re-mix to OFF to keep the LFE.1 fully discrete! For non-LFE.1 I’d manually reroute the lows some Dolby 4.0 mixes may require some sub bass extension.

[JBL 4645]

I’ve made a few changes in the past week. I’ve swapped the Behringer GEQ3102 around from centre to placing it on sidewall surrounds while removing one of the other EQ. I still need to get x4 FBQ3102 when a shipment arrives in the UK.

I’ve put in as many BP filters on the DCX2496 to handle LF and HF EQ. The JBL sub is back on Behringer FBQ2496 with the other channel running the LCRS sub bass extension.

I’ve aimed the microphone right at the front while going though each and every channel one at time aiming for possible flat response. While looking at the RTA and listening to tonal shape (thou I can’t plot all the 31 bands) I have to make do and the rest is guessing.

I’ve added LCR up together while looking at the level on the RTA. Adding in the surrounds for regular stereo left/right sidewall/rear wall I’ve had to go back and too a few times. I’ve even changed one of the polarity on the sidewall surrounds to get the low end to add a bit higher and trimmed off any peaks so I can see flat response right up to 16KHz.

Lastly I careful (thou still in the process of doing it) trimming in the surrounds with LCR while wideband pink noise plays softy, looking at any frequency that adds on or peaks first also walking around the room slowly while listening for front and surround uniformity.

I’ve used the JVC EQ patched in on main surround output from the AVR to trim as master EQ for (regular surrounds) to back down some frequencies and to give a steady extra boast to 16KHz.

I think I’ll get x5 FBQ3102 because I could use a matching EQ on the main surround outputs with individual EQ for each sidewall and rear wall surround array. Also thinking of putting in x4 more control 1 to fill in the gapes between the each x3 sidewall surrounds to tighten up uniformity. I’d have to get Behringer A500 soon to revamp all-channels.

I could do some (series and parallel) wiring so the amp will see impedance that it likes. Thou I’d prefer to run the parallel with stereo amp running each sidewall and rear wall.

Listening to Poseidon (2005) at the moment water is strong element in chapter 5 as it cascades crashes into Poseidon capsizing the vessel upside-down. Water seamlessly moves over the ocean liner on all channels and from surrounds as Richard Dreyfuss looks towards “the rouge wave” loaming high over the ship.

Panned distant explosions too left-front as the ship bobs around in the ocean with score playing smoothly over LCR and surrounds keeps my attention looking forwards while noting the details over LCR till all calms down.

I still have few lose ends to tighten up I can’t run the subs at the moment its too late, I’d have see what I can do later in the day afternoon.

Chapter 10 has few dialogue pans from left to centre and centre to right before the saviours encounter the next challenge.

[JBL 4645]

A new attraction for today in a make-over with a new (Samson SRK21 equipment rack) that arrived early today and a few more to come at least x3 more for a total x4 racks stacked in the corner of the living room between the chimney breast and door.

Removed some of the feet from Alesis RA300 and placed the amps with tiny gap that will a small pc fan fitted behind the amps blowing cool flow of air around.

I had to flip the rack onto its back to fit the amps which made it easier than trying to hold an amp and screw it into the frame.

From dismantling 98% of the system it sure looks like a mess! :D

I can also work easier now in getting the floor fitted down or the rest of the cinema seats that is way, way overdue by almost a year now!

The rack that stood alongside the left side of living room was kinder holding me back. It has taken about 1hour 30mins to just undone everything and it would no doubt take a further 2 to 3 hours to put it back together and another 2 hours to do a sound check.

I have the system in my head so if I’m not too distracted I can remember where each part of the system was wired up and grounding amps etc.

The cabling should be damn sight neater this time around

[JBL 4645]

It was a damn sight easier to rack the amps this way then lift and flip the rack casing upwards!

I can see the rack getting full before it’s started but it sure looks a damn sight neater.

[JBL 4645]

It looks like a load of spaghetti wiring! :D that is shameful yet someone how it worked wonders. :D

[JBL 4645]

Slowly piece by piece its placed to one side ready to be reassembled. I’ll get the next rack next week and so on till I have racks then push with ether getting the floor laid down!

[JBL 4645]

The wooden rack I’ll place elsewhere not sure as of yet it won’t be used in living room maybe the bedroom or hallway.

Vacuumed around where the wooden rack stood a lot of Sooty hair and dust underneath!

Well I’ve had break for 1 hour as my back was arching after 90 mins undoing all the leads and installing the amps.

[JBL 4645]

After 5 hours and sweating 15 minutes I’ve managed to get this much done.

The bedroom is now really cluttered hopefully for a few weeks well the very least a few months.

First removed the computer after checking how much cable I had and for now it will do. The pc is out of the living final!

Cleaned down the deck to make it clean. Vacuumed behind the deck there was lot of fur and dust that was sprayed and cleaned.

[JBL 4645]

Slowly getting they’re desk all cleaned down and ready to move into the bedroom. Sooty was hiding he doesn’t like the sound of the vacuum cleaner.

[JBL 4645]

Tossed out the Samson cardboard box!

[JBL 4645]

After the cleaning was done Sooty came in to inspect.:D

[JBL 4645]

The Towering Equipment Rack. :D I think the Samson SRK21 has really motivated me today.

No it’s most certainly not staying like that for long. I need a frigging stepladder to turn the Marantz 1030 on. :D

[JBL 4645]

The rack fits into the corner nicely only snag is the mains point is pushing the cabinet out by a least 4 inches. I’ll have to modify the mains point move it over a so the mains point is centred with the rack and also fit in second mains point.

I have an idea for the rack spacing plate rather than spend money on piece steel with x4 holes in it I could get some thin MDF cut to rack spacing size and drill out four holes test it to see if it fits and then spray paint it black.

I spaced the MDX4600 a little way from rest of the Behringer gear as that MDX4600 heats up a bit.

Well I have to get the leads sorted out now and connect it all back up the way it was 7 hours ago.

[JBL 4645]

SIGH all this to listen to music and listen to film soundtracks.

I’ve forgotten to mark the cables with tag which one goes where!?

I’ll cut new cables soon with all XLR male/female assigned to the various audio processors rather than phone plugs being mixed into the sound chain its taken me some 6 hours last night and my back was arching after (crouching down and doing the itching dragon) because my bollocks was itching beyond disbelief! :D

I settled down for 9 hours sleep while thinking about XLR and phone leads which one goes where?

I managed to get x3 channels up and running now that is though loudspeakers.

Left HF
Right LF
Sub bass/LFE.1

I need to get all-new loudspeaker cable cheap price good quality and make each length equal so the right channel is further away I’ll cut the cables so that they are same exact length for LCR LF/HF. Sub bass as well!

I’ll get all-new cables for the surrounds and re-wire that entirely!

I have to Frankenstein the LCR cables for the time being by cutting off length cable elsewhere and connecting it up.

I think the cable for LCR LF/HF should be 30 feet for each length because I have no idea if I want to place the racking in the kitchen at some later time so I might as well go for 30 feet or the very least 20 feet which is 5 longer than the living-rooms length.

This hobby is expensive :p

[JBL 4645]

Another snag that I noticed was the height of the racks! They’re going to be in the way or the sidewall surrounds are going to be in the way! If I wanted to move the rack out and make some changes one of the left sidewall surrounds is going to be in the way.

I’ll have to look this over at different angles and find a solution. I could get away with x3 racks with one of the racks stacked up on the other rack just bit away from where the left surround is placed.

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=51239&stc=1&d=1304461762

At present I have to remove the Marnatz 1030 that will power the regular surrounds / centre back surround and discrete stereo rear surround on Dolby 7.1. Its not a big deal to remove the amp or I could remove the surround then swig the rack around the removal of the surround would take less time, but this, is only temporally until I get second rack next week. Then save up for rack shelving to get the rest of the gear neatly stacked and racked. The third rack will be for extra new amps when I start revamping the Alesis RA300 over to Behringer A500, very late in the year.

I’ve just noticed something else! How am I going to get the rack that will be placed on top to be fully secure! I guess weight will hold it down, wait a second…

Bingo! I looked underneath the rack and with the removal of the wheels and without placing the top plate on the next rack I simple drop the rack over the casing and screw it up tightly. Least I hope it works that way otherwise I’ll leave it down to the sheer weight holding the rack down!

[hjames]

Another snag that I noticed was the height of the racks! They’re going to be in the way or the sidewall surrounds are going to be in the way! If I wanted to move the rack out and make some changes one of the left sidewall surrounds is going to be in the way.


Looks like the Racks aren't too tall, its the extra stuff stacked on top of them thats pushing such heights ...
maybe you should put the gear into 3 or 4 racks instead of stacking it like that?

No flames meant, just a comment - besides, those tall stacks look dangerous!

[JBL 4645]

Looks like the Racks aren't too tall, its the extra stuff stacked on top of them thats pushing such heights ...
maybe you should put the gear into 3 or 4 racks instead of stacking it like that?

No flames meant, just a comment - besides, those tall stacks look dangerous!

Maybe you didn’t read though the whole post which is fairly long…:p

This is only till I get the next rack which should be around mid May after I order the next one around late next week.

I’d still have to buy shelves and I’d only have enough for one rack that will be made up and I’ll stack the gear inside it until I get the next rack then some shelving at cheap cost to neatly stack the audio and video gear.

At the moment there are no dents in the top of the cabinet rack no buckles no warping speed no anti-matter its just fine, knock on wood! :D Sure I guess over years it might warp a little just like doors warp each year with temperature differences (expanding and shrinking) but that is far from worries at the moment. It bothers me most when door doesn’t shut correctly.

I’m just glad to get the clutter off the living room floor and out of the way of the left front channel! I’m sure some sound frequencies was rebounding early and arriving late so that is now open and clear!

I still have that left front wall to deal with and make the wall seamless flush so that it can fix the 80Hz slopping dip I have because lows are going into area and rebounding and adding a negative shallow slopping 80Hz that levels out above near 100Hz its okay going downwards the control 5 can put out a (mild only 40Hz at soft SPL db) thou I rarely adjust the crossover to that range for few films.

I’ll have to also make sure Sooty can’t sneak in-between while chewing away on mains cables! Frizzzzzled :D Sooty wouldn’t nice it would break my heart so I’ll have to block any gaps off under a few inches (if cat can get its head though it can get its body though).

[JBL 4645]

plus the fact that many consumer gear (on the bottom) will bow with all that weight on it ... those cases are light weight thin metal. :eek:

How much time do you want to bet on! I’ll find a way to if not reinforce it at the present time, its sound.

I could sit on the rack! It was damn heavy to lift the box in I think the pillars are fairly strong.

Sure anything will buckle and bend I noticed one of the side panels was slightly bent and I straightened it out with an adjustable socket bending the ends of the metal so that the panels would fit snug and tight and once screwed in it will settle over time.

Any other person would be barking like dog on the phone, I was cool about it, it was minor probable happened when it was packed in the factory.

[hjames]

How much time do you want to bet on! I’ll find a way to if not reinforce it at the present time, its sound.


He's not saying the rack will bend, he's saying the consumer gear, the cases of the equipment itself, they are just thin sheet metal and could bend.
But time will tell.

And about my comments on the tall stack - I just read back some more posts and saw you talking about stacking one rack on top of another - even if they are bolted together, thats a dangerous idea - all that weight in a single stack could kill if it falls somehow. Better to both them together side to side like TiDome did on his slide out racks. Sorry, don't have a link to the image of his side-by-side racks, but it would certainly be more stable than a double or triple height rack. When I was in CATV in the early 90s, we rebuilt our headend - 30-some AV gear racks. None of them were more than 6 foot tall, and all were bolted together side to side - its a safe and sane way to go about it.

Ahh - found it!
http://www.audioheritage.org/vbulletin/showthread.php?25102-JBL-Synthesis-Room-Design-and-Treatment/page17

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=39501&stc=1&d=1243313676

and more populated ...
http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=39649&stc=1&d=1243816014

[JBL 4645]

That dome rack is pretty neat and its easy the dome he had plasterboard wall to knock out and hide it out of the way of dangling cables and wires.

I have faith that placing the rack on top you also must have faith you’re a believer aren’t you? I’m non-believer but I have faith it will hold otherwise I wouldn’t try it. It will hold the top of the cabinet is sound I could get a baby elephant to sit on top and it should hold and baby elephant is damn heavy. Thou getting a baby elephant though the front door might be tricky.:D

I guess the dome rack must have cost around $80.00 its just the Skelton not the side panels just the framing so it must have cost $80.00.

[JBL 4645]

Well the LCR is now all up and running as it should be along with sub bass.

Only snag at the moment is the running of the surrounds though the Harman Kardon AVP1a. Yes a bit of ground hum its unlike anything I’ve encountered before.

I think the Harman is “dead Jim“! I tried out at least several ideas to diagnose the issue I thought it was the AVR outputting a dodgy signal and tested the surrounds direct to AVR to amp and they worked fine no ground hum just pure JMJ that I have playing at the moment.

I thought it was GEQ3102 that was acting up but unplugged the cables and routed straight from AVR to Harman and same issue a kinder of negative sound sucker that removes the audio input content while applying a mains hum!

I’ve had mains hum before and still the audio signal was able to get past. This one is different. I then opened up the Harman thou what use is that if I don’t know the design of the unit. I looked it over but looking won’t do anything it needs to be tested.

I then thought lets plug it back in and place the laserdisc player single channel into the Harman’s input and use the lead for output passing directly to Alesis RA300. Yes it worked fine with pure audio!

Now I’m really baffled but I’ll get down to solving this if its the last thing I do tonight.

I’ll swap mains leads around to see if its something to do with a particularly mains point. The socket on the other side of the room is where it was originally plugged in (it may or may not have something to do with that).

So I can put the lid back on the Harman and test it out again and try the other mains point and also check the mains point where its now currently running though why the Harman? Even the audio inputs failed to light up so when I plugged it straight from Pioneer to Harman and to Alesis all is fine somewhere there’s a sneaky electrical Gremlin hiding!

And has to this new snag I have faith I’ll locate the Gremlin Bugger because it does bugger the sound up. :D

I still think the radio station being picked up by one of the Alesis was the oddest thing a few years back at least I had free radio station though the mains! I swear this home is possessed maybe an exorcism is in order to get the devil out of the electrics. :D

http://wondersinthedark.files.wordpress.com/2010/10/the-exorcist.jpg

[JBL 4645]

Got the Harman sussed out it was me forgetting to powering on the secondary EQ that’s between the main AVR and Harman.

Got the video modes up and running with vintage STAR TREK Journey To Babel playing.

Next step to get the rear surrounds back up and running and then I’ll set the microphone up and do thorough sound check to make sure each LCR is balanced tonally along with surrounds and LFE.1 sub bass and LCRS sub bass extension.

I’ll have to get a few more XLR plugs and then de-solder all the leads and cut new cables I had dodgy phone TRS plug that was giving headache :banghead: tonight I swear I could have eaten it! :D I tossed that away and found spare XLR female that worked out fine for centre channel between Yamaha DPS-100 and the MDX4600.

I could do with catnap now I’m knackered. :snore:

[JBL 4645]

Sooty likes to mug for shot after all this is his home also.

Last night was right pigs ole ear getting the one of the surrounds right sidewall back up and running smoothly that TRS plug was getting on my nerves and tossed it out and replaced it with a spare XLR female I had laying around.

[JBL 4645]

Sooty looks almost taller than rack itself. :p Sooty likes opening doors meowing while typing and playing and laying on the desk. (you’re a good boy Sooty).

Look at that mink coat!

[JBL 4645]

Whoa another picture of Sooty! :D

[JBL 4645]

I’ve measured out the spacing between the next cinema seat and the front row may have to be moved slightly forwards to allow the racks to be swivelled around and the seating would block the path by a few inches the seating will be only 17 inches away from the racking way too close!

I’ll have to shift the seating forward a bit so it clears and move the back row seating slightly forwards not too much so it intrudes on next racking holding the video gear.

The base floor platform needs to be recalculated as to where it should go as its only to secure the seating on first level with back row raised up to so there’s clear viewing from behind.

I’ll stack the rest of gear into the next rack that will be placed besides the other rack and the third rack placed on top.

Its not easy to EQ at present standing up and crouching down to itch the dragon as the RTA is above and the EQ is stacked below in the rack but I get a good workout :D from it.

I think the fronts or least one of the fronts sounds a bit open thou its really hard to determine but after listening to same music or film on and off over and over from the same seating position it does seem open without the clutter blocking the front loudspeakers.

[JBL 4645]

The view here shows how clear the front is where before that wooden rack that has served well over a few years. It’s still in hallway and I might use it for something useful maybe a playing climbing frame for Sooty.

Once I’ve repositioned mains power socket on the wall the rack should push in with just a tiny few millimetres sticking out in front of chimney breast.

I’d have to cut out or make a small chase along the wall by a few inches to move the mains cable and hopeful they’ll be couple of inches to spare to pull along just enough to drill some holes and wall-plug and screw the mains socket up securely.

I’ll fit in an extra mains socket so its centred with other rack.

I’ll use cable ties to secure mains extension boxes inside the rack casing vertically and make sure all power leads are horizontal and channelling down towards sockets neatly (same with) the audio leads I like to make sure each and every lead is correctly labelled so I know where it goes if undone and I would to simply forget I’d know by the labelling. Simple cost effective way is masking tape with clearly written words indicating which lead is which.

I like to get a few extra tools and knock a sodden hole in wall and get that projector in the kitchen!

Its covered up with small bath towel to keep dust off it at present and hasn’t been used that much this year and lamp is still okay and I’ve had this now for a few years now. I guess lamp might be around for replacement sometime next year or the year after seeing it doesn’t get much use. Only a couple of hours ever once in while over a year.

[JBL 4645]

Re-thinking the racking situation over and I don’t want the rack or the rack shouldn’t go too high due to left sidewall surround positioning.

SRK16 and SRK 12 are my best option for adding on any extra height SRK 16 looks favourable as that would leave plenty of clearance for the rack to be moved out without knocking into the control 1 headroom will be at least 4 inches!

http://s3.amazonaws.com/samsontech/related_docs/SRK%20Mechanical%20Drawing.pdf

I could move the Behringer audio processing into the SRK 16 with amps taking up space in SRK 21 and audio/video in the other SRK 21 and another SRK 16 so it might turn out to be x4 Samson racks x2 large racks with x2 medium size racks. Otherwise I’d have to change the surrounds entirely.

[hjames]

Post #552 here:
Re-thinking the racking situation over and I don’t want the rack or the rack shouldn’t go too high due to left sidewall surround positioning.

SRK16 and SRK 12 are my best option for adding on any extra height SRK 16 looks favourable as that would leave plenty of clearance for the rack to be moved out without knocking into the control 1 headroom will be at least 4 inches!

http://s3.amazonaws.com/samsontech/related_docs/SRK%20Mechanical%20Drawing.pdf

I could move the Behringer audio processing into the SRK 16 with amps taking up space in SRK 21 and audio/video in the other SRK 21 and another SRK 16 so it might turn out to be x4 Samson racks x2 large racks with x2 medium size racks. Otherwise I’d have to change the surrounds entirely.

Post #61 in the Rack System thread-
Re-thinking the racking situation over and I don’t want the rack or the rack shouldn’t go too high due to left sidewall surround positioning.

SRK16 and SRK 12 are my best option for adding on any extra height SRK 16 looks favourable as that would leave plenty of clearance for the rack to be moved out without knocking into the control 1 headroom will be at least 4 inches!

http://s3.amazonaws.com/samsontech/r...%20Drawing.pdf

I could move the Behringer audio processing into the SRK 16 with amps taking up space in SRK 21 and audio/video in the other SRK 21 and another SRK 16 so it might turn out to be x4 Samson racks x2 large racks with x2 medium size racks. Otherwise I’d have to change the surrounds entirely.
.


Don't post the same thing in two different thread - perhaps just keep this one going ...
the other thread shows dangerous over-stacking and shouldn't be an example to others

[JBL 4645]

Post #552 here:

Post #61 in the Rack System thread-


Don't post the same thing in two different thread - perhaps just keep this one going ...
the other thread shows dangerous over-stacking and shouldn't be an example to others

I thought I made the other post different I guess that is what happens when overworking for 10 hours straight :D

its safe as houses! Believe me I can mildly wobble it and it stays intact it would take a huge jolt a huge jolt for that that’s only staying like that to tip over and its only going to be like that for a couple weeks unless Bournemouth is stuck by an earthquake it isn’t going anywhere. Its better stacked that way over laying across the floor where I need to move from one space to the next and next, now its all in one space thou it will be another space in couple of weeks.

Over stacking no, its sound, its not going to budge a millimetre. :p

[JBL 4645]

Aw ... 7 stacked components with the amp on top (on top of a rolling rack) ...what could possibly go wrong ? ;)

The amp is not as heavy as you might think it is! If I didn’t care about my gear I wouldn’t have stacked it like that for only temporarily its been stacked in different order on that wooden rack for years and didn’t harm the sound or equipment one way or the other.

I can sleep on the floor below and not worry about any one single item falling off. You worry too much! :p

I’d even let my cat play on top if he can jump that high :D And the odd thing Sooty hasn’t been sniffing around it, that’s a first! Often when I put something new he’s sniffing around it for hours. He only laid on the floor and groomed himself down because he’s got more living room floor space to run around now.

You know I’ve even seen idiots that put plants on top of hi fi gear and plants need watering! No common sense what so ever! You just don’t put plants on electrical items!

http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=51253&stc=1&d=1304624444

You’re probably wondering what’s inside that box in the corner above the door? Shhh secret! :D

[Allanvh5150]

Possibly Ash, some people have nothing better to do than moan and whine about the most meaningless things.......:)

[JBL 4645]

Possibly Ash, some people have nothing better to do than moan and whine about the most meaningless things.......:)

Al

That is what it is meaningless its just a rack for heavens sakes! I could have stacked all the gear in that corner years ago without anyone grumbling about it, but I wouldn’t do that, I'd be asking for to tip over then! That rack as it is, at the moment is perfectly sound.

I need some cable on reel to make up new lengthy audio cables RCA to XLR and then XLR to XLR and patch all behind the rack neat and tidily. As it is at the moment it’s a bit of birds nest! if you’ve done fishing you’d know what birds nest is. :D

[JBL 4645]

He he - easy for the words to bubble out, but please remember, I'm not just "some people." I have (well) paid experience building, wiring, and maintaining commercial AV racks that HAD to work correctly, had to be reliable, and had to be safe. My good works meant the owners made good money. Its not just blowin' smoke.

After 20 some years of field and headend work, I spent 4 years as the chief tech for a 200,000+ cable TV system in the DC area. Satellite receivers, demodulators, AV processors, AM & FM Modulators, Fiber optic and Microwave transmitters. I held an FCC First Class radiotelephone license back in those days. When I left that company I spent a year at the Associated Press Network News center in Wash, DC as a vacation relief tech, maintaining their racks of gear in their US network center. Perhaps you've heard of "AP Network News"?

I have years of actual background in this field, so my comments are not empty or meaningless. 'Course if you don't know this stuff, they might seem to be.

Just remember, if that tippy stack of gear falls, none of us will be there to help, it'll just be Ash and Sooty, and I don't want to see either of you get hurt.

Fu%&k sakes! Its only for a COUPLE OF WEEKS!:dead_horse:

Wow see what I mean Al!

Speculation Heather! How many days now as it been up! I think it’s 3 days! My Sooty couldn’t care a fury ass bottle brush tail about sniffing around and unless my Sooty is the incredible Hulk there is no way he can tip that rack over, what drugs are you smoking? :D

And yes I will stack a smaller SKR16 rack 23 inches high on top of the SKR21, what you going do call the rack police? :p

I appreciate you’ve had 20 years experience but I seem to recall your set-up look cluttered if not an easy jumping ground for Teddy my cat would have to have one heck of jump to get up almost 7 feet! He’d have to run and jump it which he hasn’t got the space to do!

I was originally going to use rack bars screwed into timber that was going to be screwed into the chimney breast with frame going all the way around. I still have the rack bars, maybe I’ll use the rack bars for something else?:dont-know:

[hjames]

Who said the cat would knock it over? I never did.
That's on you, unable to read a conversation correctly.

I also never said it was cheap - that's you jumping at nothing, as usual.
My only comment was when you pile a rack on another rack, or pile a stack of gear loosely on top of a rack,
its risky and could be dangerous, and you should be careful, at the least.

Teddy can't jump on my rack either - but even if he could, nothing is loosely piled on top, everything is screwed into it solidly.
Our 35 lb TV is bolted to a wall-mount rated for 150lbs, and that's screwed into wood studs with lag bolts - its not coming down.

But with your loose piles, if things fall it could crush a cat, break your arm or worse.

But obviously, never-mind, you are happy - apparently that's all that matters, tra la tra la.

I just deleted my early morning comment urging you to be safe,
just go ahead stacking stuff up ...

[JBL 4645]

Oh no the cable from the living! Sooty likes chewing on the cable! Oh no don’t panic there’s only a few volts in that cable! :eek:

That cable will be poked though a hole in wall once I get a drill bit and then place cable trunking around the door in bedroom and then trailing down and tracking along the skirting board to wherever the pc is going to stand where door is it’s in the way! But manageable to still get in and out of the room…(without tripping over the cable)! And Sooty has shown little interest in the cable and that amazes me because normally he’d be playing with something that is new.

Cats mellow down someone once told me but that doesn’t mean they’re still active.

Maybe Sooty would get an eating muchies attack around 2am in the morning and would start to chew away on the cable and cross a wire that shorts out the entire internet globally!:D

[JBL 4645]

Who said the cat would knock it over? I never did.
That's on you, unable to read a conversation correctly.

Teddy can't jump on my rack either - but even if he could, nothing is loosely piled on top, everything is screwed into it solidly.
Our 35 lb TV is bolted to a wall-mount rated for 150lbs, and that's screwed into wood studs with lag bolts - its not coming down.

But with your loose piles, if things fall it could crush a cat, break your arm or worse.

But obviously, never-mind, you are happy - apparently that's all that matters, tra la tra la.

I just deleted my early morning comment urging you to be safe,
just go ahead stacking stuff up ...

You might think the Samson is cheap rack. You’re quiet right it is cheap and that’s why I brought it, I’m not made money. I’m quiet surprised the cabinet is stable as it is on its own.

I looked at racks that were tall going for around just over £100.00 S/H but pick up only and what if it was too tall it would obstruct one of the sidewall surrounds.

So the SRK16 rack placed onto the SKR21 would be 23 inches that would lave 4 inches between top of the rack and control 1 plenty of space a fly can swoop between unless its blind fly. :D SPAT! :p

As to being happy, I’m not happy I’m only pleased to get that clutter off the floor.

Oh, I see it’s gone from horizontal floor clutter to vertical clutter! :D

[Allanvh5150]

:)

[JBL 4645]

I’ve removed one item down lower so I can see the RTA display a bit easier at seated height next to cinema seat. I can’t EQ while standing up and crouch down every few seconds!

Oh, well new week and order another Samson SRK21 late this week to get the audio/video gear neatly out of the way. I’d have to wait till I can afford some rack shelves. I’ll place the Pioneer laserdisc player on the lower base of rack and stack players on top till I get some shelving to space out each item the laserdisc player will stay on the bottom.

I usually ground with wire attached to the side of chaises you can see wire going from the mixers side that is screwed to the rear of the rack.

[JBL 4645]

I‘ve got TOP GUN (1986) chapter 16 on repeat while I’m in the bedroom because those end credits in Dolby Stereo TrueHD sound so vintage co:cool:ol.

Its cool listening to matching fronts with difference in the centre bass guitar while other instruments play on front left and right with mild difference on stereo surrounds vocals perform on left and right with echo in the surrounds. Cool music zipping sound that races along surrounds on certain points in the music that has me looking to left and right.
LFE.1 plays mildly after all that afterburning!

[80sKid]

Ashley,

I look in on this thread once in a while, in order to see what you've been up to lately. As you know, I've never commented up until now. But I feel compelled to share some thoughts, that I hope give you some food for thought.

I must admit up from that I have certainly not read this entire thread -- because there's so much here, I pretty much just skim the postings. So, please forgive me if some of this territory I cover has been previously discussed.

I also want to point out that my comments are not intended to sound like "I know more than you." I simply feel that I have some insightful thoughts to share, that hopefully will help improve your system. I honestly want your system to sound better and that's where my comments come from.

The thing that I'm always amazed by, when I look at pictures of your room, is how the room's acoustics have not been addressed.

I believe I can safely say that everyone with professional experience in cinema sound and home theater installations is of the opinion that the most important part of a room's sound is the acoustics.

Most of us, who have a "media room" or "home theater" in our home have a great inability to address room acoustics fully, because we have to deal with spouses who don't want to look at sound treatments. But you have the "luxury" of a room where anything goes. So, in my opinion, the area that you should be spending the most time and resources on is the sound of the room itself -- before you focus on the sound of the gear.

You're throwing so much equipment at this room, in an effort to improve the sound, but what can be achieved is being limited by the room's inherent acoustical flaws. I can appreciate that you're a gear hound and love all that electronica around you. But you're not really getting all you can out of your components, because the space you've put them in is hampering their ability to deliver results. All the equalizers in the world can only do so much to compensate for a room that is acoustically flawed.

I notice that you have some kind of acoustic treatment above the front speakers. But what exactly is behind that bed sheet I am not sure. Other than this one area, I see no treatments in the room. Based on both my readings from acoustical experts and my own experience, at a minimum, every room will benefit from acoustical treatments that control the 1st order reflection points in the room (especially on the floor and walls -- although, ideally, also the ceiling). Because these reflections have the greatest impact on system sound and can result in cluttering the soundstage and hampering the imaging of your speakers.

In your shoes, the very first thing I would do with that room would be to install a large area rug. And I would put thick padding under it, so that it controls more than just the highest frequencies.

Next, I would address the walls. If you want the cheapest means possible of controlling sound, I suggest egg crate foam. This was the inexpensive solution I used once in an apartment of mine, to control the flutter echo problem I had. I suspect the dimensions of your space are similar to that apartment I had, so I have to imagine that your room has some significant flutter echo.

Some foam products intended for sound control purposes can be expensive (example: Sonex). But I'm all for cheap solutions and I believe the cheapest source for egg crate foam is the supplemental padding for bed mattresses, that are widely sold in housewares stores. That's exactly what I used in my apartment and it worked quite well.

You can also make some cheap bass traps by getting more of these bed pads and keeping them rolled up and standing in the corners of the room. Sure, there are better bass traps out there, but this is better than nothing and is likely the cheapest option available to you.

I would also consider adding some furnishings to the room that would act as sound diffusors (which scatter sound randomly, thus breaking up destructive sound patterns in the room). Examples are book cases filled with books of random sizes, or DVDs/videos/LDs set at staggered depths. Of course you can buy, or make, dedicated sound diffusors. But you may be able to find bookcases and books for less money at (what we call in the U.S.) "thrift stores" and "yard sales."

Once you've taken some time to address your room's acoustics, I'm confident you'll find that your system sounds better than it ever has.

[Krunchy]

Holy Crap Ash! that is one heck of a tower of power you got there, that theater seat better be bolted to the floor & be equiped with some Indy 500 style seat belts :D
Dude how loud do you play your movies, do the neighbors ever complain, or more likely, do they ever not!?

Can you list all the pieces of gear that are currently in service & what they do, this is all for your home theather not for music per se right?
I think 80skid is right, first thing I thought of when I saw one of the photos is you need an area rug just for starters.

Enjoy my friend! :)

(I did not read the entire thread nor do I intend to, just too long)

[JBL 4645]

Well it’s all going to be changed around next week I’ll order another rack late in the week so I guess 4 days till it turns up in the post?

The older Marantz are on the revamp list!

Should I start at the top and work down, why not!

Marantz 1030 runs the rear back surrounds and is powered or pre-amp powered by the Pioneer VSP200 that sits below. I have ran (record out) from Harman Kardon AVP1a to route the stereo signal so I can run all the x10 sidewall to rear wall as regular surrounds Dolby Stereo matrix mono or discrete mono/stereo on all types of films similar to how a cinema would run it without Dolby-EX.

I have three inputs to chose from on the VSP200 there are four inputs only three are used.

One input is for regular surrounds

Second input is for centre back surround when I wish to route the centre phantom from Dolby digital with stereo surrounds and send information to back freeing up the sidewall surrounds, the overhead is also activated.

Three input is for stereo rear discrete from the Sony BDP-S550 bluray analogue 8channel RCA outputs I use the rear back plugged direct as I don’t have AVR to handle the new Dolby TrueHD I use the player to output it. The rest of the six outputs are sent to main Kenwood KRF-X9050D THX select AVR.

I have to set volume and leave it if I lower the main AVR fader or rise it won’t do the rear surround as that is on separate line! But once balanced first with pink noise the show can go on!

Below is the Yamaha DSP1-100 its used as preamp for the centre channel and has lowpass output that’s sent to the audio mixer to enhance the lows for centre front on separate sub placed at the back of the room. The DSP-100 has some fancy DSP effects modes thou I don’t use its okay once in while when bored but I’d never run it for friends.

Below is Yamaha DSR-70 pro that is preamp for left/right front its also got a lowpass output that’s sent to the audio mixer and you can see the mixer! I can remove centre phantom from the left/right and route it elsewhere on the fronts but don’t have separate amp at the moment for that feature I can create an IMAX like upper centre with it or I can use it and mix blend the centre phantom onto the centre discrete at very mild level thou plenty of good decent bluray have been butchered this way so I hardly ever do that.

I can also cerate an extra mono surround using the decoder thou its not currently rigged up for that feature maybe soon!

Below is Harman Kardon AVP1a its used for main surround decoder to extract centre phantom from stereo surrounds as well as overheard mono matrix surround and works okay on some films. The rest of how its set up might hurt your head, it works and serves its function well, enough said. It also has lowpass that sends the rear lows from surrounds to the mixer and the sub level adjuster would be set along with the rest of the levels that are level matched so they are all equal on the mixer. So I hardly use the sub level on the Harman.

Below is Kenwood KRF-X9050D THX select main AVR decoder Dolby Stereo Digital Pro-logic II movie- music / dts / CS5.1 other DSP effects that I don’t bother using.

Outputs for CRT and RGB for LCD video projector as well as normal video and S-video

Analogue video 1 isn’t being used at present

Video mode 2 laserdisc player digital PCM coaxial and dts are only currently active Dolby AC-3 still haven’t got an AC-3 demodulator.

Video mode 3 Phillips bluray player digital input optical

Video mode 6channel in Sony bluray player with 6 main rca inputs (I explained how this works above)

Below Behringer MDX4600 channels

1 left front direct from main AVR
Output is then routed to Yamaha DSR-70 then routes to the Behringer DCX2496 (am I hurting your head with all this)! :D its then routed to Alesis RA300 LF

2 centre front direct from main AVR
Output is then routed to Yamaha DSP-100 then routes to the Behringer DCX2496 its then routed to Alesis RA300 LF

3 right front direct from main AVR
Output is then routed to Yamaha DSR-70 then routes to the Behringer DCX2496 its then routed to Alesis RA300 LF

4 LFE.1 direct from main AVR
Output is then routed to the Behringer FBQ2496 then its routed to Alesis RA300

Below is Behringer FBQ2496 parametric equalizer for LCRS sub bass extension on channel A / LFE.1 is on channel B all outputs are then sent to their own amp/subs

Below DCX2496 for LCR LF/HF and I still need a few more as and when the time comes around for extra-left extra-right and subs and much more.

I’m still waiting to get FBQ3102 31 band EQ at present GEQ3102 is providing EQ for the sidewall surrounds

Below Marantz 1030 powers the HF for left and right fronts
Below Marnatz 1030 powers the HF for centre channel / overhead surround when used

Below Alesis RA300 LF for left and right front
Below Alesis RA300 LFE.1 on channel 1 / LF for centre on channel 2
Below Alesis RA300 sidewall surrounds

Below the audio mixer Technics SH-8055 for rear back wall surrounds
Below JVC secondary EQ direct inut from main AVR surrounds

The picture is not clear due to camera flash rebounding off the silver items!
Sony bluray/DVD
Phillips bluray/DVD
Pioneer DVD multi regional player
Yamada DVD-RW recorder/player
Pioneer DVD player switched off at present
Pioneer laserdisc player/DVD

dts demo cd test disc that I use for setting up all-channels as 2min5sec of wideband pink noise for each track and music tracks.

[Krunchy]

Thats a lot of stuff Ash, if you werent so far away I would love to watch a movie with you
& see what that set up can do.

Have fun Buddy!

[JBL 4645]

Thats a lot of stuff Ash, if you werent so far away I would love to watch a movie with you
& see what that set up can do.

Have fun Buddy!

If I want to listen in stereo I press the button on the AVR from A&B to (A) where all channels are condensed down to (stereo 2channel) front.

Yeah maybe some drapes hang on the walls its finding some that are cheap and nice colour

A friend said back in the early 1990’s “you need all this? Just watch a film”? I only had the three Marantz amps the Yamaha DSR70 / JVC Hi-Fi NICAM digital VCR / JBL control 5 LCR and SB-5 TCB surrounds where a pair of 10” I think 16oham unknown they had wooden veneer with an unknown cloth not of this world! :beamup:

And yes at the time I needed all that! :D It hasn’t really come that far in 20 years.:p

Well when you’re in the area pop around.:)

[Krunchy]

It hasn’t really come that far in 20 years.:p

Well when you’re in the area pop around.:)

Thanks Ashley, I'll bring over a 12 pack of Cream, BTW the Marantz units look very nice.
As long as you're having a good time thats all that matters :)

[JBL 4645]

Thanks Ashley, I'll bring over a 12 pack of Cream, BTW the Marantz units look very nice.
As long as you're having a good time thats all that matters :)

I’ll provide the beverage :cheers:you can provide the munchies. :lurk:

Which Marartz 1030 or 1050? The volume dial on 1030 is scratchy due to grim dirt and dust build up over the years. It needs stripping down. I can get it run I have to run some music or pink noise (to it only) with other channels muted each day when I turn it on to get left/right equal balanced then its okay to run.

Spraying the volume pot with compressed air will over shift the dirt inside elsewhere I need to ether get a new volume pot for it or crack it open and careful clean it up. I only keep the volume at present on it 1pm position (or am) depending on the day. :D

Good time, tell the truth no. I just take each day as it comes around.:) Tinnitus can last hours or days.

[JBL 4645]

I just looked at the site where I got the first Samson SRK21 and its “due soon” I guess they’re out of stock and no worries I’ll go to another supplier and might have to pay small delivery cost fee.

I'll chase this up tomorrow.

[JBL 4645]

I’m having a bit of quiet day of all the rubbles and blasting bright mid range! I’ve used some HP filters since I have few bands to work with on DCX2496 due to crossover filters taking up some % space and the EQ filters on the HF LCR.

The range up until yesterday was damn bright down around below 100Hz and I’ve managed to flat that down with BPF while widening the Q on of some bands filters to reduce the whole of each LCR down so the midrange isn’t given earache levels!

The ear is sensitive to middle range and some highs till it naturally drops down or is less sensitive so a little bumping easy does it now and listening to some shootouts of Underworld Evolution Dolby Stereo digital chapter 9, where Selene is shooting William Corvinus now a fully bad ass Lycan blood sucker!

Amp without any audio limiting via the MDX4600 will eat up way too much that in want in the room so I use some limiting it to tame the beast of blasting gunfire because its not real a real pistol would be damn loud without earplugs and who wants to listen to that and risk permanent ear damage!

I can get the control 5 to give a mild 40Hz into the room which is far after all they are plastic small yet surprisingly a mild 40Hz now and then not bad. I’d set the crossover over LCRS bass extension down a bit lower later on to keep lows like male voices around the 100Hz filtered out a bit (for the meantime).

LFE.1 I’d let that bugger play as it is keeping the LFE.1 within a few db of LCR its still noticeable when muting the channel the extra low special effects are missing if its too high its in your face and it will mask the lows from LCR and occasional lows on the surrounds.

Nice warm dialogue moment in chapter 6, as (Steven Mackintosh) Tanis explains the past. Lows come from the centre rather than oozing from the sub with slight noticeable give away.

I’ve been thinking most I bet most homes do have the LFE.1 sub up far too high because most of the sound from LCR might be bright midrange or partly too high in the upper low range forcing a user to play the sub far too high and using up far too much amp power.

If I can see the levels on the DCX when plugging LFE.1 into DCX just to see how high it goes over one of the LCR fronts its often 10db or sometimes under because not much as been put into but I tend to keep LFE.1 now within +2db over lows on the LCRS when playing the biggest lows otherwise its just noise!

I think its true when you get older you turn it down :p when young you might know as much and don’t care about your hearing or anyone else’s hearing being mildly damaged.

[80sKid]

Ummmm... what happened to the response on room acoustics?

I got an email notice that you had responded to my posting, Ashley. But I didn't have time to come here and read it until now. And now that I'm here, I can't find the posting.

[JBL 4645]

Ummmm... what happened to the response on room acoustics?

I got an email notice that you had responded to my posting, Ashley. But I didn't have time to come here and read it until now. And now that I'm here, I can't find the posting.

Don’t know must be harmonics in the upper ionosphere?

Room treatment is the last thing I’d use something simple maybe carpet tiles on the walls there cheap and they come with assorted colours to choose from. Or good ole drapes hung around the rear and sidewalls with something like rockwool behind a thin layer. But that will only happen way, way later.

As to this egg foam I’m aware it’s costly and may only short a few frequencies I have some of this foam that came with digital camera I might do some tests on the right front sidewall. Now unless I can liberate a whole bundle of the back of lorry for a few pounds otherwise its around a few £pounds for I think 24” square.

I want to see your room, start up thread and let’s see “the little picture show” with pictures. :)

[JBL 4645]

Bloody hell it seems to work! At first its hard to tell listening with two ears next to front right playing wideband pink noise. My left ear is hearing far too much pink noise and less of what I would expect from the foam?

So I started to think and thought what if I place my left finger over my ear then listen! I moved my right ear as close to the wall within a few inches and moved my hand in-between I hard no difference expect a rise in brightness of the sound.

Next I moved the foam in-between and heard the sound drop least in frequency SPL db it dulled softened down.

I’d have to run some further tests I want to see for myself roughly what frequencies it deals with.

It would be hard to do this against the ceiling I’d need short scaffolding with platform while I lay down sideways and listen with one ear near to the ceiling. That can takes hmm hiring scaffolding.:hmm: There has to be another simple way.

[JBL 4645]

Blimey commander! You have some blue foam moving towards Alpha.:D

This is just a small piece of two sets of foam that was packed in the camera box. It’s also my favourite but its also a cold colour to put on the walls.

The samples I have are 9 inches long by 6 ½ inches wide.

I’d have to look around ebay and see if anyone is selling it off the back end of lorry without necessarily going to the back end of lorry.

[JBL 4645]

Well looked at some egg foam on ebay I’d have to see how this price compares to the local foam supplier on the high street. To do the wall is expensive £82.00 pounds to do single wall, mad! I'd look around for back end lorry or think about.

[JBL 4645]

I like this set-up in Brainstorm (1983) I like it.


http://i233.photobucket.com/albums/ee15/Evolution3417/BrainstormDVD-RW1.jpg


http://i233.photobucket.com/albums/ee15/Evolution3417/BrainstormDVD-RW3.jpg

[80sKid]

I totally forgot about that set design in Brainstorm. That is in fact one of my all-time favorite movies, but i haven't seen it in a decade.

Regarding egg crate foam for sound control: As I mentioned, the cheapest way to get large sheets of it is to buy what's intended for use on a bed mattress...

Examples:
http://cgi.ebay.com/Beautyrest-Convoluted-Foam-Mattress-Pad-Topper-NEW-/150578646450?pt=US_Mattress_Pads_Covers&var=&hash=item68c75e8a9c

http://cgi.ebay.com/KING-Bed-FOAM-MATTRESS-Egg-Crate-Eggcrate-Overlay-Pad-/200399948584?pt=US_Mattress_Pads_Covers&hash=item2ea8c48b28

http://www.amazon.com/Convoluted-Foam-Mattress-Pads-Size/dp/B001UNSS8M

http://www.amazon.com/Duro-Med-Convoluted-Hospital-Size-Blue-Inch/dp/B000EWVPCQ/


Here's some that's 4" thick (the thicker it is, the the lower the frequencies that it can control)...
http://www.amazon.com/Convoluted-Foam-Mattress-Pads-Size/dp/B00274ZDK4


I would think that you could find the equivalent in Britain.

[JBL 4645]

I brought a second, second-hand DSR70Pro off ebay today for £30.00 looks to be about in the same condition as my current DSR70Pro. When the DSR70Pro came it was new at £179.99 this was around 1990 its now 2011, 21 years later!

Well I wanted a matching decoder so I can do the five screen front now all I need is two new amps Beheringer A500 another DCX2496 a few new HF tweeters for the other pair of control 5 a few plastic tweeter pizio things, rip the parts and do a another diy unless I happen to come across some really cheap going for under £100.00 JBL compression drover with horns and I need x5 matching! So might was well cut some corners and save some money for the meantime.

I still have to get x3 FBQ3102 for the fronts so EQ of each speaker sounds the same in bass mid and highs. Not a cheap project but at least I managed to get decoder at cheap (buy now price).

I still need more Samson SRK21 racks sigh, I’ll get there. No rush.

[JBL 4645]

Currently the set-up looks like this at the moment I changed it 4 nights ago.

I’ve had the control 5 placed at the same height level as the temporary base platform that isn’t permanently fixed yet further testing before knocking it up with flush vertical barrier wall covered with high frequency absorbent material.

Usual the higher in narrow room especially when placed far too close to the ceiling results in narrow stereo front from what I learned over the years. I have placed some empty JBL control 1 boxes to place height up from 42 ½ inches to 50 ½ inches and spread the left right out a bit wider while toeing them inwards.

I listened to Logan’s Run for dialogue Foley and effects panning across the LCR all seems well a little refining to do and EQ as the position has been moved from one space to different space.

The bed sheet placed above is for the LCD video projector so that image and sound is one whole rather then been disconcerted it’s a little distraction with CRT flat screen below but if the new height position works out I’d keep it there. Maybe a cheap small 42 inch LCD flat screen placed below with drop down micro perforated screen sometime in the late future no rush for proper screen at the moment and I’d be choosing a brand name that doesn’t have rip off price tag unlike others.

Also I’m sure the bass mid as increased with new height so I’d have to trim the lows to match smoothly with sub bass extension that’s placed at the back of the room and match it with LFE.1 frequency response when testing with pink noise.

I must have played the end credits on STAR TREK some 50 times last night before changing the positioning 5 JBL control 5 There is only three great names in sound JBL DOLBY TrueHD and THX!:p

If I had larger JBL 12 inch with HF horn or even 15 inch with HF horn it might be impossible to get wild wide stereo front with narrow room like mine which is why I use smaller JBL larger JBL matching LCR or five for the fronts would be ideal as it would be more manageable for me to control the EQ and allow the fronts to play as low as they can down to 40Hz or lower. The control 5 can just manage 40Hz but only at soft SPL db levels or slightly higher with audio compression to prevent high peaks damaging the loudspeakers. Softer moments with lows would sound okay like the scene in Surrogates (2009) where agent Peters steps into a machine to get recharged there is low humming mild rumble down around 38Hz to 41Hz.

[JBL 4645]

A few extracts of DIRTY HARRY DOLBY TrueHD 6channel the last part of the audio might distort as the SPL was set to 80dbc and the level on machinegun fire wasn’t really that loud over LCR low end. The Harry jabs with knife to leg Scorpio yelling hollowing out aaaaaaoooouuwwwwww is epic cracks me up laughing.

I like the Lalo Schifrin score got a kinder Mission Impossible beat to it a few parts epic score.:applaud:


http://www.youtube.com/watch?v=jKkFIomvnjs

[JBL 4645]

Played the scene again with SPL set at 90dbc seems to work a bit better even with machinegun that sounds more like a road jackhammer than machinegun. Added in a few DSP echo effects on Yamaha DSP-100 just for laughs. :D That is one epic yell.
I can’t help myself from sniggering :p at guy in red ski mask hollowing out when stabbed with knife into leg.


http://www.youtube.com/watch?v=fZrqtLaIm7U

[JBL 4645]

Got get a better webcam this one just pitiful at handling brightness/contrast levels.


http://www.youtube.com/watch?v=xzkLKx7RGwM&feature=player_embedded#at=45

[JBL 4645]

Dennis Hooper brilliant “the pigs no pigs” :D

What do we do, Bob?
Do! I’ll show what we’ll do.


http://www.youtube.com/watch?v=qyrLF9HT4XA&feature=player_embedded

[80sKid]

Well looked at some egg foam on ebay I’d have to see how this price compares to the local foam supplier on the high street. To do the wall is expensive £82.00 pounds to do single wall, mad! I'd look around for back end lorry or think about.

You don't actually want to use the foam in one big piece. Two reasons: (1) you don't want to want to make the walls surfaces entirely sound absorbent in one big section and then have large untreated areas. (2) You can make the foam go further, by cutting it into pieces and distributing it around the walls.

When you cut it, you can either choose to go with multiple pieces and create sort of a checkerboard pattern. Or, if you want to do less cutting, you can cut it into long strips and run the strips up walls, with gaps between them (essentially foam stripes up the wall) -- such as 0.5m of foam, then 0.75m wall exposed, then another 0.5m wide vertical strip, 0.75m of wall, etc.

Ideally, one of these strips should be placed on the sidewalls a the first reflection point (which you can determine by having someone hold a mirror flat against the side wall and move it forwards and back slowly -- when you see the speaker's reflection from your listening chair, that's the 1st order reflection point).

Here are some visual examples below. But note that you don't have to have your pieces of foam touching each other like in these pictures. Spreading out the pieces out will allow you to retain some reflective surfaces, so that the room does not become entirely dead. Unlike most of these pictures, having pieces near/in the corners is a good goal.

51475
http://www.acoustictop.com/wall_system/image/CR-07.jpg
http://envirotech-acoustics.com/images/noise-control.jpg

http://www.primacoustic.com/pics/broadway/BW-studio1.jpg

http://www.primacoustic.com/pics/broadway/BW-studio1.jpg

To attach the foam, if your walls are wood or wallboard, you can use thumbtacks through the foam (if you use a color of tack that blends in with the foam color, most people won't even notice them). That saves you from having to use adhesive, which is more expensive and will permanently affect the walls or paint. It also allows you move the pieces to experiment, if you want to.

[JBL 4645]

Thanks Ashley, I'll bring over a 12 pack of Cream, BTW the Marantz units look very nice.
As long as you're having a good time thats all that matters :)

On second thoughts bring the cream soda…:p

Bring 80 cans I know lets make it 127 cans.:D

[JBL 4645]

Well a delivery arrived just past midday and thinking it was foam tiles as it was large and lightweight?

Upon opening box I found lots of newspaper and realized it must be the my second Yamaha DSR70Pro.

The packing very nice job lots of paper surrounding the unit and at least 10 meters of bubble wrap! Users manual included and that’s it!

I’m surprised the unit has very few starches for model that was produced around 1990 for £179.99 when new.

Mine as few minor surface scratches for 21 years!

Well I need x2 more amps x1 more DCX2496 a few spare parts for the other pair of control 5 a few RCA phone leads with 1x Y-rca phone lead to make the trick work and I’m only a few steps away from 5 screen matrix for classic 70mm films optical disc.

[JBL 4645]

See I wasn’t kidding about the newspaper it’s the perfect room absorbent material yet! :D I’ll just glue it to the walls and I’m sorted. :p

[JBL 4645]

The Yamaha DSR70Pro!

[JBL 4645]

The bubble wrap must have been at least 3” thick all around. It was like unwrapping a Russian doll wrap up in bubble warp. Bubble wrap! Bubble wrap! :D

[JBL 4645]

Finally I managed to get to DSR70Pro under layers of bubble wrap at the seller took pride in making it safe for transport! :thmbsup:

[JBL 4645]

Nice I like it. It does have cigarette smell around it so I’ll clean it up when it get the second Samson SRK21 installed soon! Which should have a few weeks ago! I can see maybe at least x3 SRK21 and x3 SRK16 or maybe more to run the sound system. I’m fresh out of mains points now! So I’d have to make plans for designing a mains terminal to support all this and beyond.

[JBL 4645]

Rear view of the inputs and outputs the unit can support up to 5 inputs stereo fronts and stereo surrounds centre but no sub input (would have been nice). The DSR70Pro is simple to use with press the centre off and rotate the balance until the centre sounds are equal on both sides of the left and right front. Its uncommon a mix would have far too much level on left front of the Lt-Rt signal rarely happens today, thou in the past it was kinder common that VHS tape would have lousy balance.

[JBL 4645]

Yes The Towering In-rack Inferno is perfectly safe. :D I’d be glad to get this top half neatly racked.

I could do a rough five-screen matrix hook-up by disregarding one of the stereo amps but without crossover and other matching parts it won’t be worth my time so I’ll just have to wait on a bit longer.

I really want to get some MDF for the floor next week and get the floor done then I can worry about the raised platform for the rear row later on I’ll just get it measured out and stick the first row of 3 seats in.

[JBL 4645]

Another thing I noticed is the stiffness of the balance level where on my first DSR70Pro it’s a bit loser since its had a lot of 21 years use! I guess the owner of this DSR70Pro maybe only had it running for 1 or 2 then placed it in the loft while he ran a new AVR? Or then again maybe didn’t use the balance level as often as I did? It feels how I first got mine 21 years ago.

I could unplug the DSP100 and use the RCA phone and connect up DSR70Pro not sure if I have spare RCA leads laying around?

What to do with DSP100? I’m sure I can find some good use for it I can’t think of good one at the moment.

Well it works! Also I helps with preamp-ing up boast for DCX2496 inputs. Got the DSP100 in OFF mode for time being until I can hammer out a new idea The smell of cigarette smoke on my hands! YUCK! I’m going to clean the front of it down because the smell of stale cigarette smoke is disgusting.

Sorted! Polished it down the smell lingers on my fingers and I’m thinking what the f&*^k I don’t smoke!

[JBL 4645]

The package has arrived and Sooty already approves of with sniff and 5 paws and one can not go against the God of Sooty otherwise he’ll dispense lighting-bolts from his paws. :p

[JBL 4645]

I wonder what's inside the box??

I think I’ll buy another package I like it already! I don’t mind the grey it reflects on personality. Sorted! :)

[JBL 4645]

Now I have to wait for the glue to turn up as that is separately posted.

[JBL 4645]

I need to get the side window sorted so I can place tiles along both sides of the room (as and where) hell I might just do the whole room out and see for myself first hand how it sounds?

[80sKid]

...hell I might just do the whole room out and see for myself first hand how it sounds?

Well, remember you don't want to cover every wall surface, because rooms with walls that are covered entirely in acoustic treatments are very dead sounding. You may not like the sound of your room at that point. So, spreading the foam out as much as possible should be the goal.

And really if you're going to avidly pursue acoustically treating your room, you should start looking at more broadband solutions, as the others were suggesting. The foam was simply a cheap and easy way to tame the room's worst reflections.

But if you want to get serious about controlling the room's acoustics, you'll want to consider bass traps. Because, as you noticed, the foam doesn't really do anything for low frequencies. Bass traps will control a wider spectrum of frequencies. But obviously we're talking about another level of expense and I can totally understand how that may not be practical for your situation.

Just as some FYI reading, here's a look at how some folks have built their own traps from scratch...
http://www.radford.edu/~shelm/acoustics/bass-traps.html
http://webpages.charter.net/jdgeisen/BassTraps/BassTrap1.htm
http://www.basstraps.net/DIY-BASS-TRAPS-MADE-EASY.pdf

And here are some nice ready-to-go kits...
http://www.readyacoustics.com/index.php?main_page=index&cPath=26_11_15
http://www.atsacoustics.com/cat--DIY-Acoustic-Materials--102.html

There are also bass trap panels available that are fully built and ready to be hung, right out of the shipping box. But they are super expensive, so I don't think I'll even bother posting links.

But I honestly think that with a tad more foam on the walls and a rug/carpet on the floor, that you'll have taken a big step forward with your room's sound. You can then take your time in considering how you want to move forward with your room and whether or not you want to make further investments in sound treatments.

[JBL 4645]

Going to get pushing on with THX home baffle wall next week need to get a bag of 3 inch screws that I forget to buy the yesterday. Had the timber and plasterboard delivered yesterday with a 1/3 broken trying to carry it up the stairs the guy took bit of jolt when he slipped on the first floor level at only 3 feet up the steps! It was going easy but I think the overhanging above staircase bridged the gap between the plasterboard and cursed the guy to slip.

I got straight to him asking if he’s okay while lifting the plasterboard off him. He was okay and its happened to me in the past the stairway is not what I call safe or doesn’t meet safety regulations of today. The edges of the walls need to be absorbed. If you took a fall and banged you’re head into the side its going to be rather nasty!

I gave the feller 10 min to recover while I hammered out a new idea.

I had to measure twice for my needs and I decided to go with his idea of cutting the sheets of (4 x 8) plasterboard outside.

The length of the baffle wall will be 9 feet and 2 inches each sheet was cut into widths of 22 inches by 47 ½ not quiet 4 feet but that’s okay I can work around it’s not a big deal.

I’d take my time building this if I had all the materials I could knock it up in day but it would require a lot of test with frequency sweeps and program material like STAR TREK II THE WRATH OF KHAN (1982) DVD early version I don’t want to try it with bluray.

The baffle will be built in several stages first the timber needs to be placed around the upper front wall in U shape along each sidewall and length of the front wall a lip so the timber can be screwed into place.

The timber is 11 feet and needs only a little cut for each panel as walls are not evenly built one part might bend in slightly.

The screws holes will be filled with liquid nails to keep the wall-plug in firm position.

The timber or base platform will be just around 22 inches in depth enough for the control 5 five screen to sit on it. Each control 5 will have bit timber placed around the base of the loudspeaker that will be screwed into base platform to prevent loudspeaker moving backwards or side to side. Angle toeing will have to be determined of course.

Cutting the plasterboard to fit around the JBL control 5 shouldn’t be too difficulty even thou the control 5 has an odd shape it should all easily fit together.

I’d have to make frame that goes right around attached to the ceiling with extra support timber screwed into the front wall.

Each section of plasterboard will be screwed into the timber that will have beams virtually positioned so the plasterboard has something to bite into for a secure fitting.

I need to pack the inside with fibreglass on the front wall and on the back side of the plasterboard so its fully absorbed on the inside from cabinet reverberation reflection on the walls and plasterboard.

This will take a few or so weeks to finalize so no real rush. The front barrier wall will be absorbed I’ll look around for suitable adorable martial for the last part of the task.

So looks like I’m finally getting around to this, as its been on the list of many things for about 4 years.

So far cost for this is around £50.00 I gather another £40.00 will finish it off only wish the timber was £1 50 for 11 feet :D

[JBL 4645]

Also done some unusually testing and that is holding the loudspeaker and feeling what the mix feels like?

Your excellency, have you been listening?
Terrell

I have indeed, captain. You have done well.
Khan


The feel of the phaser as Terrell opens fire on one of the regular 1 personnel was surely felt at the Empire Leicester Square for a rather soft quiet moment and the poor bugger only had another week before having holiday on nimus 9. :D

Most of the soundtrack is ether bright midrange in the face with very little in the low but its there it just needs exploring and a little understanding. Feeling it from 65 feet away from the front in circle even to this day 21 years later was breathtaking remarkable of the JBL 4675-A. I could fit three of these loudspeakers in but they just won’t have enough spacing for decent stereo front I’d need at least several feet 5 or at minimum which I don’t have. So I’d have to go with funky groovy vintage plaster control 5, unless a set of 10 or 12 come around at decent (buy now price).

You can feel a lot more when placing you’re hands on the loudspeaker and it was just like that at the Empire it was like the JBL 4675-A was positioned within a few feet of me without the shrilly top end busting my ears in.

I have done things like resting my back to front and standing right up in front with chest against the control 5. I have done tests in the past some 10 or more years ago with JBL 15” placed against my chest and the feeling was like being at the Empire the energy was pressing and pounding and yes it was a bit unnerving uncomfortable at times as it was in the Empire a bit threatening at times, but the high end was nicely controlled without the need for reaching for earplugs!

I know how these films should sound or feel like that information is imprinted on my body feelings memory cells. Even soft Foley effects when Kirk sits down on his couch and crosses his legs onto sit in front of him was mildly felt thou a bit exaggerated because in real life this just wouldn’t be felt unless you placed you’re hands on the body of the person on object that they were going to place their feet onto, it just wouldn’t happen, its as if the THX sound system puts the audience as close as possible on the inside of the loudspeaker kinder of.

[JBL 4645]

Frequency waterfall of the centre channel only the phaser is somewhere around the 200Hz range it would be a lot easier to spot it if the film have three isolated DOLBY DIGITAL 5.1 mixes

Dialogue 5.1
Sound effects 5.1
Score 5.1

I would then be able precisely pinpoint which part of the frequency spectrum the phaser covers its hard with shouting and score playing all at once so my best guess is where I have outlined in white.

Now the energy will require a bit more amp power and with that in mind I’d have to do battery of tests while using microphone as in room to see how much of the frequency waterfall mirrors the graph, but I’d need a new MIC100 to power the ECM8000 first! I could try using the SPL db metre it would be rather crude test.

[80sKid]

Seriously? You're building a baffle wall in that tiny space?

Those are called for in the cinema, because of the large distance between the speaker arrays in a theatrical installation. It's overkill for your system. There are other more serious acoustic issues with your room that need help first.

Additionally, I don't see sound absorbent material for the baffle wall in your pics. Do you know that THX calls for such material across the baffle surface? You need something like rock wool or owens-corning 703. (THX certification specificies a specific material, but I suspect you wouldn't want to see the price tag for it.)

[1audiohack]

Post 604, it looks like Sooty's getting pretty good with the camera. :p

[JBL 4645]

Post 604, it looks like Sooty's getting pretty good with the camera. :p

Sooty has keen eye for the camera.:D

Quiet a few have put up THX home baffles, Barry they are so choice or not much different than anything else with loudspeakers mounted flush so smoother sound is heard.

If I keep cleaning up all of Sooty’s fur within a few months I’d have ultimate acoustical absorbent material. I’m call it: Sooty 604 THX 5 paw approved! :p

[JBL 4645]

I’m playing a bit of SALT at the moment without the pepper, which makes me sneeze. :D


http://www.youtube.com/watch?v=wG78sO7SwPA&feature=player_embedded

Adding in a bit of audio compression just having fun without the use of hiss!

[JBL 4645]

SALT Damn good action film mix nicely balanced over Inspection that was sheer noisy hopeless of film mix.


http://www.youtube.com/watch?v=-04ulSGgrKQ

[JBL 4645]

http://www.youtube.com/watch?v=cIOkAzWLCJs&feature=player_embedded

[JBL 4645]

Well I’ve started at 8:00am I have all day to get the THX home baffle wall done. The Picture Little Show later on tonight. I’m sweating like a pig so far!:banana: At least I'll get a good workout.

[JBL 4645]

I’ve been at for 4hours straight now having a 20min break then its back to living room.

There’s still a lot, lot more to do.

Got STAR TREK (2009) playing with the stereo surrounds ON it helps me concentrate. :D

[JBL 4645]

Well its break time is over its back to work for another 4 hours.

[JBL 4645]

I’ve been at it for 10 hours with only 15min break and I had to pop out and get some 2inch screws for screwing the timber into the sidewalls and across the ceiling.

I’m still not finished yet I have to reinforce the base platform that’s been made up of x4 panels. I have to give it extra support with beams and some more timber on the floor.

I have to also place timber across the base in-between each JBL control 5.

I don’t think I’d get around to cutting plasterboard tonight

[JBL 4645]

Tightening up the panels with bit of timber screwed in underneath.

Cut two small pieces of wood and placed it side by side of the JBL control 5 its fitted into place it won’t move backwards as the wedge enclosure is butt tight against the wood.

I’ll see how much more I can get down for tonight before getting some kip as I’m buggered for standing up for 10 hours my feet need some kip!

[JBL 4645]

Day 2 now it might be possible to get the plasterboard cut and fitted up today thou each cut has to be the same within.

Sooty had a little explore. :D

The loudspeaker cable needs to be revamped at later time with fresh equal lengths of x10 runs. I drilled in holes into the base platform to poke the cables though.

I have to get two more of those horn tweeters and x2 new JBL HF tweeters a bass mid. The five-screen matrix is still a long way off before being up and running.

[JBL 4645]

I’ll attach some wood underneath the base so that I can fit in extra plasterboard going around the CRT and some beams on the sides of CRT so that the plasterboard fully covers the front, but what if? What if I get a cheap flat screen TV no big deal it should still fit with simply changing the plasterboard for the lower part of the baffle wall.


I’ve mark out 11 inch from the centre of each JBL control 5 and used an off-cut to centre up where I want the beam to go. I have place x5 beams vertically so the each panel of plasterboard has something to bite into for a secure fit.

In-between each JBL control 5 I’ll attach some small cut of wood so the plasterboard bites into the bottom part with beam running vertical towards ceiling.

Cut the plasterboard so that the shape fits around nicely (I can’t mess that up so, “measure twice cut once”).

Well I’ve had 30min break back to living room.

[JBL 4645]

At the rate its going the wood side of it has taken up most of the time. I still have to put in braces to stiffen up the vertical beams. I don’t see the plasterboard cutting for at least another day or two, maybe.

Sooty got behind the camera for shot. I think he’s good photographer, he’s got a keen eye. :D

All the JBL control 5 can be slid out from within the THX baffle wall. All I need to do is remove the grill the place my hand inside the port and pull it out. I didn’t see that idea a few days ago it just came too me. So that makes that part easy.

I might have some spare off cuts of plasterboard to put in the left front corner as its only 18 inches between the chimney breast and the THX home baffle wall.

Some angles around the baffle framing weren’t easy to get the electrical drill in and keeping the drill straight for the holes. So far I haven’t broken a drill bit.

Got some Madonna Immaculate Collection :banana: playing to keep m good mood. Oh well back to the living room.

[JBL 4645]

Well it’s been a bit of messy night once I got started on cutting the plasterboard. I vacuumed on each cut or slice and shaving of the plasterboard into shape. Only another x4 panels to place up

I’ve been at this now for 15 hours. I’ll get a few more done then get some kip. It’s slowly starting to come into shape.

I’ll place extra plasterboard on the lower part of base platform and around the CRT so al that needs timber beams underneath to give support too the weight above at the moment its fairly tight very little tendency to move.

I placed masking tape around the cuts to keep plaster dust getting over the JBL control 5 and everywhere else.

To move JBL control 5 back into the baffle is easy I just remove the grill and place my hand inside the port and tilt it upwards whilst pushing it backwards then its easy to turn it around and replace the new loudspeaker cable as soon as I get around it.

Also I can move the whole JBL control 5 out if I wanted just tilt it back then grab the bottom and easy it of baffle wall.

I’ll get some cheap car carpet and place several layers over the THX home baffle wall, until it feels nice and spongy and absorbent.

I used handsaw for straight against the plasterboard with the spirit-level to eye marking with pen for the cutting of plasterboard.

[JBL 4645]

All the sides of the plasterboard are screwed into the framing. I’ll get a few more bags next week to give it a thorough soundly tight all around fitting.

I have to get installation material out of the loft and put that up or I can buy a cheap roll next week save me the hassle of climbing up into the loft.

Fitting the other 4 panels up is going to be a joy of fun as there are rough edges to shave off until smooth otherwise its going to be a fun rest of the night. My feet are aching after standing up for nearly 15 hours.

I'm buggered my feet are saying: we want some kip.:D

[Jonas_h]

What material are you using for the wall?

EDIT: I see you are using plasterboard.. Wont that defeat the purpose of a baffle wall? High freqs will be reflected right off the material.

[JBL 4645]

Day 3 of the THX home baffle wall build so far its going okay with the odd few problematic encounters that I’ve managed to work around.

Cutting is a slow process but generally there’s nothing to it. The sound in the centre is starting to sound different while playing Jerry Goldsmith STAR TREK THE MOTION PICTURE (1979) on CD.

Looks like I’ll be able to finish the barrier wall this afternoon and then figure out how to get the absorbent material down from the loft. I have that wooden rake that used to hold the audio gear and stool that can help me step up onto the wooden frame and then I’d have to pull myself up though the hatch. If not doable I’ll get some material next week or towards the end of the month as I need to cover the front.

I might not go with car carpet it will be too thin and at the round cost of £20.00 avenge for a few meters it’s going to be a bit costly. So far the THX baffle wall as cost around £60.00 that’s not bad going.

[JBL 4645]

Only one panel left to put up now.

The right hand side was rather difficult glad I got that side out of the way now. The left hand side should be a lot easier.

I should have this finished by 19:00 then I can tidy up the mess and mop the floor down and have listen.

[JBL 4645]

Finally finished it at around 18:30 and then spent the next 30 mins till around 19:00 tiding up and cleaning and moping the floor over to get all that dust up and the floor came out nice shiny.

All that I left now is to get some absorbent behind it I’ve only partly screwed up most of the plasterboard so that it will be quicker to remove and get behind it.

Its more reverberant behind it as I heard the sound of my voice so that will get sorted very soon.

The front I’d have to look for something down the foam and fabric shops down town to see what I can use.

[JBL 4645]

I’ll see what I can do with remaining pieces of plasterboard to see if I can’t get left side wall flush with chimney breast.

I’m going to get a cream soda now and I’m going to relax I’m totally creamed cracked! :yawn:

[JBL 4645]

I’ve temporarily placed the drapes over the window to reduce daylight seeping into the living room while placing a bit of abasement in that area of the room, until I get around to doing the wood work for a frame so that the plasterboard (maybe) or MDF is screwed up to reduce traffic noise down so many -db.

Behind the baffle wall it sounds hollow due to no absorbent material yet! I’ll get around to that part soon! I need to get some duct tape as that is really sticky and would hold well around the edges of the plasterboard that was cut to keep dust going everywhere.

[JBL 4645]

Front view shows the masking tape peeling away as its not as stick as duct tape is! I’ll place the duct tape over the masking tape so it overlaps and bonds to plasterboard I’ll get roll of that next week.

I need to put a bit of wood underneath the diy HF tweeter horn thou not bad idea to use a cassette case to tilt the HF downwards.

That’s more or less it for now I have had hours of sleep since finishing it and I’m still knackered! My eyes are feeling heavy my arms and legs too its going to take a week to recover due to my health condition. Three days to get that far and it still needs an extra 3 or 4 more days work on it.

I’m going to sleep the rest of weekend and relax.

I’m still kinder gob smacked at how the sound remains flat and focused its smooth and even without the bumpy like sound as it moves from left to centre or centre to right and left, none of that nonsense anymore.. I’ve mostly be4en listening to CD film scores and few Jerra soundtracks this afternoon.

Sub bass for sub bass extension on JBL (in SW-Remix mode) seems different with baffle wall placed above it just seems different. Same goes with sub bass extension for LCRS only seems different. Once I get other part of barrier wall placed up and I’m thinking of making shallow platform a couple of inches high to place the subs on with something extra else in mind!

[macaroonie]

Thats all coming together Ash. I see where you are going with this. I'm sure you will make it work out.
Tip.... If you want to seal the edges of the plasterboard and or attatch a tape of one sort or another give the area a spray with ' Spray Tack ' Thats the spray adhesive that carpet fitters use for edges. You can get it in B and Q in the flooring section usually. Good plan for neatness is to mask the area you want to stick / cover , spray the adhesive and immediately pull off the masking. You will need to let that stuff dry but then your masking / gaffer tape trim will stick like sh##.

PS get a cheap rug !!

Mac

[JBL 4645]

Thats all coming together Ash. I see where you are going with this. I'm sure you will make it work out.
Tip.... If you want to seal the edges of the plasterboard and or attatch a tape of one sort or another give the area a spray with ' Spray Tack ' Thats the spray adhesive that carpet fitters use for edges. You can get it in B and Q in the flooring section usually. Good plan for neatness is to mask the area you want to stick / cover , spray the adhesive and immediately pull off the masking. You will need to let that stuff dry but then your masking / gaffer tape trim will stick like sh##.

PS get a cheap rug !!

Mac

Cheers Mac

Stuff the rug only William Shatner wears a rug :D You have such an infatuation with rugs. Are you in the rug business?

Spray Tack I'll put that on list it makes sense as the glue would make a good sticky bond.


It doesn’t matter about neatness the pasteboard will be covered in dark black abasement material so the joins the tape stick on it won’t be seen only black barrier wall up in front. Black because if I run the video project the light will reflect onto the white surface and the JBL will be partly visible behind the screen with bright scenes in films.

But the spray tack is an excellent idea! I was also thinking don’t they have plastic that fits around the plasterboard cuts? You know what mean? Probably costs more than really sticky super strong gaffer tape where I’d have meters literally.

You’re right about where I’m going with it and its good complement to making any JBL sound a little better than before and doesn’t cost a lot just a lot of hard work lift and holding things on your own if you have to (do it yourself) I had no difficulty lifting the pasteboard as the sheets cut to size had less weight. A full 4 by 8 sheet no way I’d be wearing the plasterboard :D as me and the feller found out when carrying it up the stairs the guy was almost wearing the plasterboard. :D

I’m still cream cracked 3 days as taken its toll on me its been a little mental thinking and physical work. I didn’t make any drawing for this. I looked at other THX baffle walls and the whole principle was easy straight forward.

[macaroonie]

The spray tack is just there to seal the edge of the board and allow the gaffer tape something to adhere to instead of dust. Hey if you don't believe me about the rug get some of your foam panels if you have any left and lay them out on the floor in front of where you sit.
Report your findings :)

[JBL 4645]

I wouldn’t put a rug up in the room if you paid me to. :p

I’m not going back to rugs much less carpet stuck on walls its very unattractive.

[JBL 4645]

I wasn’t aware my new digital camera had panorama mode it’s a bit digital noisy.

[lgvenable]

A friend was down in Kentucky late year, bidding on quarter horses at a horse auction. He lost, but to someone he thought looked familiar. Then he realized....it was William Shatner without his rug!

[JBL 4645]

A friend was down in Kentucky late year, bidding on quarter horses at a horse auction. He lost, but to someone he thought looked familiar. Then he realized....it was William Shatner without his rug!

LOL:rotfl: That's right he's into horses.

[JBL 4645]

http://www.youtube.com/watch?v=VK2cAyo6kNM

[JBL 4645]

Basic Instinct has had multiple runs this week and still a brilliant thriller 19 years on that works very well on a who done it. Well I know Catherine Tramell did she’s the ice pick lady a cold blooded psycho killer.

One small change I made today about from doing EQ to get the bands as flat over the LCRS with limited amount that is on hand at present use new version REW RTA I’ve managed too get 98% flat on most channels if I had 1/3 for LCR I could get it tightly flat. The sidewall is not as bad as I have the GEQ3102 for the sides the other EQ for rear back and PEQ EQ on DCX for LCR LF/HF

Oh, the change its much. I stacked up the corner with some loudspeakers that are not being used and its managed too lift the shallow dip up from 70Hz 80Hz 90Hz and 100Hz. I can’t block in the corner as of yet since I haven’t placed absorbent material behind the baffle wall and I need too (unscrew remove the plasterboard) so I can easily work behind it.

Chapter 24 the car chase sounds incredibly tense with composer master Jerry Goldsmith bass timpani percussion beats nicely. Sound effects of Nick’s car driving up the hill ramming into lampposts and other objects is clearly heard from side to side.

Roxy driving the car into Nick lifting him up onto car and over, landing face down. Wow that is wicked stunt, hope the stunt man didn’t get hurt on that take. The LFE.1 come in with an extra body weight slam when Nick lands on the ground the bass over LCR knocks into him then body fall on LFE.1.

[Audiobeer]

LOL:rotfl: That's right he's into horses.

Actually he was aquitted on those charges!

[JBL 4645]

Actually he was aquitted on those charges!

What’s that then sex with horses . :p

I used to get a ride on a nice shire horse, many years ago. I think he was called hector?

[JBL 4645]

I’ve been outputting at sine wave tones while monitoring the SPL db at close range to bass/mid and HF over narrow range of frequencies.

Since the sine wave is monaural output I use Dolby pro-logic to output to centre and bypass stereo to test left and right fronts.

I can only adjust so many bands and dial in so many bands on the DCX2496 since L-R-24db is taking up most of the CPU on the DCX2496.

Tones I tested while setting for 0db or within 0.5db range setting. I used narrow band filters some bands needed quiet a bit of cut to bring each one within 0 to 0.5db.


63Hz
124Hz
161Hz
249Hz
499Hz
1.000 KHz
1.125 KHz
2.003 KHz
2.251 KHz
3.180 KHz
4.020 KHz
8.140 KHz
16.010 KHz

Re-listened to Ice Station Zebra (1968) which has a lot of dialogue panning centre front to half left/right to hard left/right.

Chapter 7 where Jones is introduced to the captain the EXO voice is panned off-screen to left front then locks to centre when he’s visible on screen in the centre position. Jones voice is panned to left or rather half left. As captain Ferraday leads Jones off the bridge to though a corridor Jones voice slowly moves outwards as if he and the captain are actually walking thou the hatch then the voices lock to centre on the next shot smoothly from the last shot on the bridge without any jumps in the sound as the baffle wall, keeps it nice.

I’ll try this approach with subs and then with surrounds by re-plugging the surrounds from their normal out and plugging them into the front outputs and use the Dolby pro-logic to output centre back when needed. The testing might take several hours extra as testing the fronts took a few hours of walking around with SPL db metre and going to bed room and selecting the next frequency on the sound generator.


Chapter 27 has neat bit of mixing as Jones looks around Zebra for the film canister he explains to the captain about the film while walking around his voice smoothly pans over LCR in one of scenes Jones walks down a few steps and the high to middle end drops off a bit and gives the impression he’s walking down a few steps off to right which made look downwards towards the right.

Jones than walks back up steps and again the voice has the same muffled slight cut off in the mix that gives the illusion of kinder height. The full range of the voice than comes back in.

[Jonas_h]

Aren't you going to put some absorbing material on the baffle wall? I cannot see what you are gaining by having the baffle wall as it is now.

Have you ever used REW for measurements instead of test tones? With REW you are getting a continuous measurement instead og discrete sine waves and REW can recommend filters for a specific target curve in your room and it can predict the response.

[JBL 4645]

Aren't you going to put some absorbing material on the baffle wall? I cannot see what you are gaining by having the baffle wall as it is now.

Have you ever used REW for measurements instead of test tones? With REW you are getting a continuous measurement instead og discrete sine waves and REW can recommend filters for a specific target curve in your room and it can predict the response.

Yes I am and I’m a little behind schedule at the moment. When something crops up on ebay I tend to watch and buy it.

Also I like to use the same martial linacoustic its kinder hard to find in the UK I used at least 8 or so keywords I even took a crack at ebay UK and nothing.

I might have to look for something close that will be soft and spongy absorbent to cover the plasterboard uniformly.


Yes I have REW on the pc and used it but I thought I‘d try a new approach because the sweep is nothing more than sine waves accelerating at fast speeds.

I took my time I wasn’t going to be impatient because I have used REW till almost blue in the face and results wasn’t getting me anywhere its neat device to use and I used the sound generator to output the tones so I can centre on tones that’d would normally be on 1/3 EQ I can’t dial in 31 bands per each channel on the DXC2496.

I might get away with using -6db crossover slopes and be able to push for 9 PEQ bands per LF HF over the 6channel outputs total of 19 bands per LCR still a little less from 31 bands.

I’m also behind getting FBQ3102 31 band EQ I have GEQ3102 that’s being used for sidewall surrounds at present and other mismatched EQ that will soon be removed/replaced with FBQ3102.


So far the smoothness of listening to Ice Station Zebra most nights now, sounds smooth first time I did the EQ last week to last nights listening I like it when the captain and Jones walk off the bridge to left front the smoothness of the dialogue panning sounds natural then snaps clearly back to centre.

I’m going to re-listen to another Dolby classic in moment on laserdisc and DVD because that was giving me headache week before last the sound pan was miles off the mark and I tried several ways until last week when frustrated with listening to Ice Station Zebra. The baffle wall still works, but if the EQ is on the piss its going to have bright passages in the centre and half dialogue pans won’t make you look and listen to that direction (as if I had two people standing ether side or me) I’d be turning around to look at that person.

The Towering Inferno has lot of half pans as Newman and McQueen exchange dialogue as the camera follows the two of them outside the tower while walking into the lobby.

[Jonas_h]

But thats where I think you're wrong: You will never be able to EQ the system well, by only using a 31 band EQ. And the measurements you do with sine's at the frequencies you mention, does not give a clear indication of the overall response of the system.

The filters which are calculated by REW uses multiple parametric eq filters which together achieves the response you want. This cannot be done with GEQ's. You are already using the DCX's which have this capability.

EDIT: You keep on mentioning that you do not have 31 bands etc... Why do you want to use that many filters? The optimal solution is as little filters as possible, as these affect the phase response of the system. So you want to minimize the amount of filters used, and this is exactly what you can do with REW and its PEQ calculations. I have used at most 9 filters for each speaker in my system, and this gives me the exact freq.response I am looking for.

[JBL 4645]

But thats where I think you're wrong: You will never be able to EQ the system well, by only using a 31 band EQ. And the measurements you do with sine's at the frequencies you mention, does not give a clear indication of the overall response of the system.

The filters which are calculated by REW uses multiple parametric eq filters which together achieves the response you want. This cannot be done with GEQ's. You are already using the DCX's which have this capability.

EDIT: You keep on mentioning that you do not have 31 bands etc... Why do you want to use that many filters? The optimal solution is as little filters as possible, as these affect the phase response of the system. So you want to minimize the amount of filters used, and this is exactly what you can do with REW and its PEQ calculations. I have used at most 9 filters for each speaker in my system, and this gives me the exact freq.response I am looking for.

Oh, I agree. I’m doing this as experiment and it seems to be working so far so good. So I’m not going to knock it.

One thing I haven’t tried yet and not sure if I can make a lead longer enough to get the SPL db meter close to JBL as the pc is some 6 meters away.

I’d the test first without then look at the close range response over each LF LCR and HF LCR one at time to see what lumpy bumps I have. The REW has filters for the DCX2496 and might be easier to calculate.

I did another test same thing on the big JBL sub because one thing I hate is excessive boom, boom that is unnatural to the mix. Doesn’t matter where it is could be 35Hz where it peaks a bit or above 60Hz and its annoying to listen to when it sounds most of the time.

I went though 18 bands the rest I use to filter off any high frequency hiss that leaks from the MDX4600 though to Alesis RA300 and it works very well, so the sub is hiss free with filter up at 2KHz and one below it at 1KHz with -36db cut Q 75 reduces any middle range dialogue filtering though and the SW-Remix sub mode that I use for DOLBY STEREO 4.2.4 mixes has its own 80Hz crossover -24db.

[JBL 4645]

I like chapter 5 for soft ambiance between Indy and Belloq as Indy places a bottle down on the table sounding to right front its partly in the centre but sound positioning is to right to create that cool sound like of being there.

Indy then pulls a chair out that scarps across the floor left front the cute Nazi spy monkey squeaks track pans from centre off to right.

Chapter 6 when Indy walks into a tent to find Marion that has deep John Williams tympani that isn’t anywhere as deep on the THX DVD its been slightly reduced trimmed SIGH listen to German track and its there only downside is its not presented in DOLBY STEREO 6channel discrete only 4.2.4 matrix.

The laserdisc is sweet and juice DOLBY in PCM. :bouncy:

[JBL 4645]

Okay I’m going see if I can’t make up lead long enough even if I have tie sting together and cover it in Vaseline to make an electrical contact. :D

Edit: I can see the other hiccup in the response only snag is the new version I can't overlap all three channels at once and make the corrections while seeing the changes transform so I'm using older version and will make my best guess prediction.

[Jonas_h]

Okay I’m going see if I can’t make up lead long enough even if I have tie sting together and cover it in Vaseline to make an electrical contact. :D

Edit: I can see the other hiccup in the response only snag is the new version I can't overlap all three channels at once and make the corrections while seeing the changes transform so I'm using older version and will make my best guess prediction.

I am very confused about what you're doing.. Why do you want to overlay all three channels and do the corrections? You have to do one speaker at a time and make it match your desired target curve.

In REW5 you should be able to see the predicted response when making your changes. Its under the EQ section.

This is a screenshot of when I set up one of my speakers:
http://dl.dropbox.com/u/10759510/ForumPics/measurements/20110709%20MAudio/left%20eq.jpg

The dotted line is the predicted response after filters are applied. The dotted line is altered whenever you change a filter.

What are your goals with all the tweakings? Dont you want to achieve the response you want, and then just "relax" and enjoy the movies?

[JBL 4645]

I am very confused about what you're doing.. Why do you want to overlay all three channels and do the corrections? You have to do one speaker at a time and make it match your desired target curve.

In REW5 you should be able to see the predicted response when making your changes. Its under the EQ section.

This is a screenshot of when I set up one of my speakers:
http://dl.dropbox.com/u/10759510/ForumPics/measurements/20110709%20MAudio/left%20eq.jpg

The dotted line is the predicted response after filters are applied. The dotted line is altered whenever you change a filter.

What are your goals with all the tweakings? Dont you want to achieve the response you want, and then just "relax" and enjoy the movies?

That is what I am doing have been doing for several years I take independent sweeps and then overlap and make the trims.

If shoe fits ware it!

[hjames]

These kind of questions are kind of pointless.

Basic comments like suggest putting down a rug to minimize reflections doesn't get far.

Ash has a plan for how he does things and what he wants out of it.

Anyone else asking for specifics usually walks away shaking their head.

Usually best to just let him do whatever he likes to do in his space.

No flames. Facts.



I am very confused about what you're doing.. Why do you want to overlay all three channels and do the corrections? You have to do one speaker at a time and make it match your desired target curve.

In REW5 you should be able to see the predicted response when making your changes. Its under the EQ section.

This is a screenshot of when I set up one of my speakers:
http://dl.dropbox.com/u/10759510/ForumPics/measurements/20110709%20MAudio/left%20eq.jpg

The dotted line is the predicted response after filters are applied. The dotted line is altered whenever you change a filter.

What are your goals with all the tweakings? Dont you want to achieve the response you want, and then just "relax" and enjoy the movies?

[JBL 4645]

I am very confused about what you're doing.. Why do you want to overlay all three channels and do the corrections? You have to do one speaker at a time and make it match your desired target curve.

In REW5 you should be able to see the predicted response when making your changes. Its under the EQ section.

This is a screenshot of when I set up one of my speakers:
http://dl.dropbox.com/u/10759510/ForumPics/measurements/20110709%20MAudio/left%20eq.jpg

The dotted line is the predicted response after filters are applied. The dotted line is altered whenever you change a filter.

What are your goals with all the tweakings? Dont you want to achieve the response you want, and then just "relax" and enjoy the movies?

I also noticed your using ½

I’d post the new LCR front graph later once it’s finalized. I haven’t used the program since I placed the baffle wall up.

The sound still sounds the same with clear smooth tracking pans across the fronts.

I listen on headphone buds to check what else might be missing then look at the frequency response of each LCR.

If the room is nicely almost dead some films have kinder echo/reverb like in STAR TREK II when Kirk walks up to his door in his home and the shhh to left dialogue to centre has slight echo in the middle range in bright room it might go slightly unnoticed.

Only anther 60 or so tiles to place around the room.:)

[Audiobeer]

Outstanding. :D

[JBL 4645]

I have just won myself a pair of used JBL Control 10 off ebay :bouncy: at really cheap price. Finally after many years drooling over these I get to own a pair at last. I’m also going to be on the look out for more and I have my eye on JBL Control 12 SR looks like the baffle wall might be coming down and revamp of larger Control will take place in new baffle wall sometime soon?

I’ve been running JBL Control 5 for 21 years and time for upgrade.:D

I can only fit three-screen in due to the width of the Control 10 or 12 SR which is around 17” wide I could push for five-screen but it would be incredibly tight and take a lot of planning design to make it work.

I also plan to modify them to run with tri-amp so that would really mean I’d be forced to get another DCX2496 to run basic three-screen 3-way or x3 DCX2496 for five-screen three-way.

I’ll wait for an update from the seller on when they have been dispatched? I guess maybe today the very least tomorrow for an early next week delivery?


I’m thinking why not revamp the surrounds to JBL Control 5? Only snag is the size and weight would need a really deep screw fitting in the sidewalls and rear wall and I’ll use the same number or more but that would cost a bomb!

Biggest problem would be he overhead as the surrounds have to be matching and I don’t fancy Control 5 hanging overhead no matter how secure they’re fitted they’d still hang down by several inches away from ceiling so I’m keep with Control 1 unless I can do an IMAX like setup with two Control 10 in the corners for only IMAX DVD DOLBY 5.1 and use an extra Control 10 for upper centre channel?

[JBL 4645]

The JBL Control 12 SR have turned up packing could be worse but arrived okay.

These are used and look like they’ve been touring on gigs or maybe in night club?

I’ve umm managed to cut left inside finger at the top and went for water under tap and made a bandage with kitchen tissue and sticky tape I don’t have any bandages.

The cut look mild hard to say I have to type right hand at moment. I’ll give it 4 or so hours to fix and re-dress it and get a catnaps.

So far I managed to use one RA300 and set the crossover on the DCX2496 at full scale! They work!

I’ll have give it a few days for my finger to heal and try and come up with an idea to repair the grills which as you can see, look a bit rough but the Control was made for the rough and tough road! It could be worse I guess?

[JBL 4645]

Jbl control 12 sr

[JBL 4645]

JBL CONTROL 12 SR

I'LL remove the grills later not now i'm not feeling well:( going to relax with catnaps nowe

[JBL 4645]

I managed to get some catnaps and a little relaxing listening to Jarre In China CD sounded clearer over the Control 5 that I have listened to many times. The sound though lows to mids to highs wasn’t harsh or brittle bright.

I then listened to Madonna Immaculate Collection several tracks “material girl and “live to tell”.

I then listened to one of favourite film scoring composers John Williams STAR WARS disc 2 “throne room and end credits” WOW parts of the orchestra hit me where it should or what excited the surroundings in the room I felt kick to stomach and chest and that’s at around less than 95dbc and not a whole of power being used up on RA300 barograph.

With my finger getting a little better I’ll check how it is around 8pm well the very lest if not 10pm and redress it.

I tested wideband pink noise from dts demo disc CD tested each channel looked at the RTA and all looks well over each Control 12 SR.

I have to get the grills straightened out which won’t be all that hard just take my time and give them a re-spray with soft gloss black paint and they should come up shining like a new penny again.

From the sounds of things, oh I forgot to run as few spot sine wave tones using Denon 20th anniversary CD I can’t be asked at the moment to use REW sound generator and walking in and out of the bedroom to living room, I want to relax!

So I’ll test the sine wave tones later I don’t expect to hear any issues the Control 12 SR appears to be sound.


One of the tracks on STAR WARS has a distortion sound on the tympani beat on disc 2 track 8 “the tractor beam/ chasm crossfire” between 4:19 and 4:20 seconds. I have played the track at lower level and though headphones, this isn’t uncommon these issues tend to happen thou very rarely do crop up unless you’re listening.

Sooty has been giving his usual sniff, sniff paw approval and rates Control 12 SR with vintage plastic 5 paws and one can not go against the word of Sooty the Sooty has spoken. :D


I gather from the rear the phone to XLR are for inputs and outputs to passive subs? I don’t have manual and I can only guess.

What order is the crossover in these JBL Control 12 SR anyone, anyone?

[JBL 4645]

Yet again did another frequency sweep of the large JBL and applied some PEQ to get it flattened out. It seemed seamless between the control 5 and with LCR sub bass extension on the smaller JBL GTO1202D muted with Ice Station Zebra as the Russian jet fighters approach Zebra or tigerfish submarine breaking though the ice.

Control 12SR not being used at the moment since I only have two and not four to use only three for fronts LCR.

There is no way no how I can lower the frequency below 20Hz on the dial in frequency on Behringer FBQ2496 it would be nice to trim the level hump. I better watch levels closely on films that have lows below 20Hz.

If I had second DCX2496 it could manage below 20Hz with crossover and a low pass filter.