Small but perfectly formed JBL home cinema
Small but perfectly formed.
The new JBL home cinema
After trying two rooms for the JBL home cinema I found the one with the longest length to be a troublesome type and so I have settled on a smaller room.
One was the (chimney breast) that stuck out mid way in the room, by (18” depth) by (61” width), so I decided to abandon the room with the 15 foot length and go with a more easier room that will still need a few basic modifications done to it.
Flooring
I plan to make a secondary floor for the (JBL home cinema) to help with vibrations from LCR surrounds, sub bass extension and LFE.1.
Bass is fairly neutral due to the concrete flooring I guess, less (boom), just a natural sounding tone, unlike the last place, where it was a bit bass heavy at the back.
What you see here is only temporarily, this will nether be placed at the back of room around summertime, when I have the budget to buy a few professional 19” racks, Samson, studio racks.
Room’s dimensions are
Length 11 feet10”
Width 10 feet 9”
Height 7 feet 7”
Yeah that’s small and I plan to shorten the height by has much as (2 ½ inches) with (2x2 timbre) and (15mm MDF or other) for the top part of the flooring. It shouldn’t cost no more than £80.00 the MDF will be the costly part of the material but not as much as the timbre beams as I only need around 6 or 7 spaced out evenly, over its length.
JBL control 1 fall in stand to attention!
Here’s my surround arsenal of battle troops ready to provide all the trills and spills on the surround channels.:D
JBL control 5 I must say sound better in a room with concrete flooring, this helps to eliminate rattles and buzzing sounds! Not to mention sub bass and LFE.1 frequencies.
Its kinder difficult to get a wide angle of the front because of the field of depth, the camera can only see what it can see, I can get very tight angles, but the sides are cropped off a bit.
Rubber matting
Now this would be great to place underneath the (timbre beams) or more rather the timber beams placed on top to add a little extra isolation.
Door
Door to the JBL home cinema room, will hath to be switched around to opened in the opposite direction, due to the raised flooring.
Platform
Horizontal platform for the front loudspeakers LCR will be placed 1” above the TV monitor and angled downwards, the length of the platform will extend the room’s width, depth of the platform will be the same as the JBL 4645 sub 18” to keep it flush.
Surrounds?
That is the question, what am I to do with 10 JBL control 1, now I can still place these on the sidewalls and rear wall and a few on the ceiling. I’m thinking I can set:
x2 for sidewall
x2 for centre back surround
x4 for height surround when available
And that’s pushing it, not quite to the original plan as I hoped and planed for, which was x16 I think?
Anyway all this, will be done over the course of the summertime no rush and there is a slim budget, as I have to mange other priorities that kinder remain on the top, but there will be a slow transformation.
Window
There’s only one in the JBL home cinema that will be blocked up with two layers of MDF cut to size. First off I’ll place a window blind in front, to give the illusion on the outside that I have the blinds closed for privacy, which isn’t far from the truth.
First layer of MDF will have a small bit of timber placed around the outside, then attached to the (window frame) securely. Next I’ll place a thin layer of (rock wool) inside it securely. Last off the second layer of MDF will be screwed to the other piece. This should reduce the traffic noise, as too what sound pressure level I have no data on this as for now, I’ll hath to wait until I get around to doing it.
I’ll take RTA readings with SPL db level metre, for a few hours note the average and the install the frame, after which I can take more readings and see if there’s been a reduced noise level, as the traffic around here is noisy during the night. Also there’s an airport nearby, Hurn international, with a few jets taking off and approaching as well.
The roof, now there’s nothing I can do about the roof, I think its (sound) so there’s no need to look that, unless I can hear (heavy rainfall) but since I’ve been here, I haven’t noticed it, with the past rainfall.
Additional absorption DIY
(Bass tarps) is out of the question, by the time I’ve stuck those in the room, I won’t have room to swing a cat around! So adsorption panels placed on the wall surfaces will suffice to add further adsorption.
(Rock wool) will be used for the panels, a soft layer placed onto a thin layer of MDF along with a (colourful fabric) for cosmetic appearance.
Interior decorative lighting system
Neon lighting will be the theme a basic red green and blue placed around the room in a hoarse shoe configuration that will be concealed near to the ceilings curve.
This will have a computerized controller when turned on will cycle though a sequence, on delay, dimming one colour and fading in the next colour, and so on.
12 volt neon is the simplest, the same type that is used for cars.
I don’t even have a seat to sit on, I’m sat here typing, sat on a JBL HT-1F and two pillows and my backside fills buggered LOL!:D
My first elusive buzzing sound!
LOL I guess Kevin O’Connell knows how to apply the right amount of low end to, buzz the audience.:D This had me starching my head for a few minutes? :banghead: I was looking at the right-hand side JBL control 5 while the sub bass extension was extending the low end from LCRS. The tone was down at around 40Hz.
The JBL control 5 wasn’t at fault, so where in the hell is coming from? I then muted all directional channels and LFE.1 leaving only the sub bass extension playing the low end from LCRS, and I could still hear this elusive buzzing sound, now this starting to get personal.
After standing back and looking at the front, I then twigged onto where it was coming from, the (vent). As I approached it and while playing back the same sequence, over and over again, I placed my finger on the plastic vent cover, and like magic it disappeared.
Well now all I need is something to place between the vent flaps to prevent the moving parts vibrating or buzzing. I cut a small piece of cardboard and folded it, and then placed it between one of the vent gaps, and then played the scene over again.
Sigh, well that’s more like it yeah. So you just never can tell what is vibrating or buzzing In that special JBL room of yours and a little quick thinking can solve it in the simplest of ways. Now starman can hum and rumble without the buzzing.:)
JBL control 1 surrounds up and running
Two angles showing the surround view and it does kinder look unsightly, even I can admit to that. Looks like an interior decorating issue for a later date, with the light turned off I hardly notice it.
How does it sound so far? I ran a pink noise test to confirm that the tone was equal, via the Pioneer VSP-200 a few adjustments on the Marantz 1030 with a slight increase on volume.
All the surrounds are (wired in series) I’ll fit the last two up in the daytime, because now I’m shattered and need some sleep, it took around 1 hour to fit two surrounds at a time, I’ve viewed over a few best sound moments updates on how that sounded later on.
JBL Control 1 centre back surrounds
Hi there, brought an electrical drill this morning from Wilkinson’s and a few pieces of 2x1 from Columbia timber yard.
Has you can see I’ve drilled and filled the hole with liquid nails and tapped in the wall plug, by around tomorrow the liquid nails would have hardened.
Screwed up and secured. Well that’s the back part done, I’ve got two sides to do next, and oh that’s going to be fun. ]
One JBL control 1 fitted. The wooden beam makes it easier to place the mounting bracket to the wood, rather than drilling dozens of holes into the wall.
Tightening up the nut, then it will be fitted to the mounting bracket and secularly tightened up.
True cinema seating best deal
I’ve been phoning around this morning for true cinema seating and have got a deal or has Noel Edmonds, would say “deal or no deal” DEAL YES!
:applaud::p:)
£10.00 per cinema seating for [Odeon Hille Premiere seating black] has seen in the picture here. I’ve ordered x6 plus I’ll have to wait until there delivery van is in the area to make it easy, the seats are all ready assembled that’s why I need to wait cost for delivery could be anywhere from £80.00 to £100.00 pounds.
So if anyone else on the forums would like to buy more of these seats I can pm you and I’ll forward the contact because they have loads of these will sadly end up in skip and that would be a shame.:(
24U Racking plate framing
Well its turned up but I think I need two more of the same for the back don’t I, providing of course I want to use rack trays that slide outwards. I’ve been viewing the studio spares catalogue that arrived early this morning and saw the cost of rack trays around £22.00 pounds that isn’t too bad providing I, don’t go nuts and buy a whole bunch of sliding trays or I can then just buy a normal tray.
Other than that I’m pleased with the look of the racking plates, very pleased. :) In the meantime I’ll keep the racking plates in the cardboard tube safely until I’ve got the timber frame fitted up along with flash virtual piece of thin MDF boarding.
Plan D has now become plan E!
Quote:
Originally Posted by
hjames
Its not the smoking you have to worry about - you have a lot of electrical equipment running in that room, don't know if you use extension cords or 3 wire power strips or whatever - but if the grid heats up it could cause a fire.
Smokers not required.
Oh, yeah your right well I don’t have any rats crawling around here Heather so unless one chews :D it’s way though a mains power line, well I guess that does make things complicated.:(
Well I present my plan D to Columbia timbre and they couldn’t make heads or tails of? :dont-know
Oh, dear where do I stand now? :( Well I was then pointed into the direction of chirpy someone who can build this and hopeful within the tight budget plan. So a local chap from Poole will be popping on over tomorrow to have a look and size it up, because even if I have measured it out, they still like to measure it for themselves, just to me sure.;)
I’ve been looking at the chap’s portfolio and it looks great with what he can build out of wood, from rocking chairs to rocking-hoarse to grandfather-clocks anything that’s wood.
:applaud:
Done a few tests Good or Bad?
Hello all, just bloody fine weather we’re having here in England at the moment, hope the pissing raining keeps to the night time to make the dry air smell fresh in the morning.
Anyway I’ve downloaded a free software package from (Home Theater Shack) site dedicated or one part, of it to the (Behringer FBQ2496) and I’ve managed to get a few issues sorted out on the JBL 4645.
One is this took a few hours to get the whole thing, well almost I need (MIDI) lead connection between the pc and (Behringer FBQ2496) to make this fully user-friendly.
So far these are test results.
Test done at 10 feet to the present listening area where the sofa is, ECM8000 was positioned behind and slightly over the back of the sofa, at ear height.
What I have done here is taken three frequency sweeps with (REW) Room EQ Wizard, the first one is with all three ports on JBL4645 18” sub as is.
http://i262.photobucket.com/albums/i...tsweeptest.jpg
Second frequency sweep is with one port hole plugged up, and as you can see there is mild difference between the, first frequency sweep.
http://i262.photobucket.com/albums/i...dsweeptest.jpg
Third frequency sweep is with two port holes plugged up, and as you can see again there is difference.
http://i262.photobucket.com/albums/i...dsweeptest.jpg
I’ve done a few more tests as well as a few guess works on the signal level calibration on the (FBQ2496). I took a reading with RTA my standard basic RTA and placed the ECM8000 1m away from the JBL sub and played some wideband pink noise from the dts calibration disc track 14 and slotted in a few filters where I saw the peak.
Filters used are
25.1Hz
+2db
0.75
40.3Hz
-23db
0.75
Now is this right is it wrong, it all seems to be trail and error and it kinder looks right to me, so far.
The first sweep wasn’t showing up to well, according to REW (Room EQ Wizard) and I forgot to add a little amplifier power, so I did a second frequency sweep test.
Final frequency sweep was with ECM8000 placed back at seating position.
First frequency sweep test
http://i262.photobucket.com/albums/i...eeptestnew.jpg
Second frequency sweep test
http://i262.photobucket.com/albums/i...hsweeptest.jpg
Cheers.:)
JBL five-screen and the Pris Attack "Balde Runner" 1982
I’ve set-up one of two extra JBL Control 5 as pre-five screen fronts a few more amplifiers and Dolby stereo decoders to make it fully functional into two system playback mode for baby boom and five screen discrete matrix that derives information from the centre channel thus making it more clearer as well as extracting part of the half panned left and right information and sending into the (two inner channels, left-centre right-centre.
Tonight’s first test is with the (1982) futuristic nightmarish thriller “Blade Runner” International Theatrical Cut after testing a few scenes out with opening sequences and The Pris Attack where Deckard is taken by surprise only to finish her off with shot to the stomach that resulted in a high pitch frenzy of screaming! A second shot reverberated outwards from taking individual tests of LCR only.
Tested left front with (CR muted) checked SPL db and was satisfied with the improvement I made.
Switching to right front with (LC muted) checked the levels of low while midrange and high HF have a different sound, noted the bass level checked it off the list and moved over to centre.
(Muting LR) while listening carefully to the centre action of her scream and the echo that’s around it and other tiny little details, until Deckard fired another shot that was bit more punchier and milder at the listen area with mild scary sound that rolled over my chest.
Playing the whole scene with LCR and sub bass extension and the LFE.1 track escalated it higher to a disturbing almost sickening point, its not cherry film its fairly violent, but that’s the whole point of the story.
Sooty stuck in JBL 4645 SIGH!
Well what happened, final happened Sooty managed to get stuck inside the JBL 4645!
Early hours of this morning while I generally let Sooty wonder around the room it crawled though one of the three lower ports that is closest to the floor got right inside it where I couldn’t even get my arm inside the port to grab it.
I had to undo all the screws and remove the 18” JBL sub bass to get the kitten out because if was unaware I could have had some music or film playing and that would harm the kitten! [Sigh] fuck sakes!
Since getting out [sigh] the little bugger 10 minites after I have replaced the JBL sub bass driver makes another attempt! Only this time, I managed to grab it by the tail hold it while, I stuck my other arm though the other port and pushed it out backwards. Little fucker! And several minutes later it tries it again! [sigh] getting a little pissed off now!:banghead:
So what I’ve tried now is to block-up one of the ports with a few plastic bags stuffed inside until Sooty, grows bigger and matures a little bit. I’d have to also place a grill over the 18” JBL sub bass driver and the smaller Eltax 12” sub bass driver somehow?
I guess Sooty likes the sound of the JBL 4645. Yesterday while watching The War of the Worlds it walks up and stands in-front of it while the atomic bomb went off weird kitten!?
Cat owner’s block up the port on the sub bass enclosure until kitten is several months old.
http://i279.photobucket.com/albums/k...nporthole1.jpg
http://i279.photobucket.com/albums/k...nporthole2.jpg
http://i279.photobucket.com/albums/k...nporthole3.jpg
http://i279.photobucket.com/albums/k...rtblocked1.jpg