picked up 2x 2360a bi radial monsters - what drivers? [Archive]

richg101

09-28-2010, 02:57 PM

i got two immaculate 2360a horns and alu driver mounts from a film studio who were getting new gear.

what drivers do people recommend to allow the highest frequency response while still allowing use down to 500hz? i been looking at the BMS coaxial compression driver which states it will play down to 300hz on the right horn, but since i love the jbl sound (i use a 2426j 1" on the smaller jbl bi radial horns-cant remember the model number) id like to stay with jbl compression drivers if i can.

Below the 2360a's i will use a pair of 2206h woofers per horn. (one of which will be running low pass at around 100hz to remove any combing problems between the pair of 12" drivers)

any suggestions on the best sounding unit?, with the grunt and finesse to go from 500hz (or lower), up to as high as possible, hopefully without needing a tweeter/super tweeter..

thanks in advance!

louped garouv

09-28-2010, 03:28 PM

1audiohack

09-28-2010, 07:35 PM

Welcome to the 2360 club! There are a handful of us here that really love these things.

I have run mine with 2441's, 2445's and 2446's and quite honestly cannot hear much of a difference between the 45's or 46's if any, in the long run I like the 2441's better, I can't really articulate why.

2360's sound very good with the constant directivity compensation curve built into the JBL crossovers like the M552, it is a curve easily duplicated with a graphic equalizer. The2360 (in my opinion) sounds bad when one tries to EQ them flat, above 10KHz it's better to just let them roll off. I listen to mine outdoors with no tweeters and think they sound fine.

I have not run a coaxial on mine as I believe the throat geometry that is almost parallel side to side for almost two feet is the limiting factor and is going to cause high distortion levels above 10KHz where the wavelength is smaller than the throat is wide. I ran 2427's (a 2426 with a two inch throat adapter from the JBL factory) just for fun as they go past 16KHZ and the top end was really no better and much of the impact was gone.

Keep us up on what you get for drivers, if you want the C.D. compensation curve I will find it for you.

Depending on what you listen to you may end up wanting a subwoofer or two to fill in under the 2206's. I tried a pair of 2234's under each 2360 and, went back to a single 12 and subs.

These are just plain fun, and just plain big!

jerv

09-28-2010, 11:31 PM

2360 is a great, big horn!

I have run mine with Radian 950 drivers (aluminium diaphragm), with 2445J (titanium) and now with the 2445's with 2450SL aquaplas coated diaphragms in them. The aquaplased dias sound best by far. The Radian sounded less detailed and clear than the JBLs. They all mesured about the same.

It is possible to eq the 2-inch drivers flat to 20 kHz, but I agree with 1audiohack: they don't sound good used like this. A supertweeter is needed. I use my 2360's from 500 Hz to about 8 kHz, where the 2404H takes over.

I run my 2360/2445 with passive network (see thread http://www.audioheritage.org/vbulletin/showthread.php?26986-Need-help-with-crossover-2440-2360-and-2405 ) with a dedicated amp, below that a pair of 2226 with active filtering and eq - one of them with a 100Hz lowpass (like you also intend). I have also tried with one 12" 2204 (plus 2245 subwoofer) per side, but the double 2226 setup gave better results in my setup. I'm not yet done with all experimenting and tweaking, though: this could change.

Cheers, and good luck with your project. Keep us posted!

richg101

10-04-2010, 07:46 AM

thanks for the feedback guys:)

i had a feeling there would be a problem with running up to 20khz. maybe a little 2404 on mini biradial mounted just above the 2360 to take care of the sparkly bits.

ill keep you all informed.

until this is sorted out here is one side of my system:-
http://img828.imageshack.us/img828/1368/img2944j.jpg

2426j on 2344a biradial horns
2206h below that
bass horn is a long horn loaded with cerwin vega stroker 12 (old version with front spider)
2206's go down to around 60-70hz then the horn does below this

here are the pair of 2360's:-

http://img339.imageshack.us/img339/2136/img2643o.jpg

http://img838.imageshack.us/img838/8679/img2644p.jpg

mint condition on the fronts, but might go for a pretty paint job once the new spray booth is sorted out:)

richg101

04-02-2011, 04:11 PM

I have finally got round to sourcing some large format compression drivers for these 2360a horns. I bought some 2451j drivers (1.4" exit) so am having some adapters made to take them to 2" exit (like the 2450j). with a 63mm long expansion from the 1.4" to 2" exit to meet the 2360a. the length of the 2450j is 63mm longer than the 2451j meaning the integral 2450j 1.4"-2" adapter is 63mm long. If i use 4x 18mm birch ply layers, lathe turned to make the body of the adapter, it will be 72mm long instead of 63mm. will this mean my drivers will end up playing very slightly lower than the 2450j? Just wonder if extending the the 1.4" to 2" expansion path by 9mm will have adverse effects on the performance and integration between the compression driver exit and the horn throat.

more10

04-03-2011, 04:48 AM

http://www.jblpro.com/pages/components/2360Aser.htm

Full horn loading to 350 Hz

I would stick 248x on them, crossing as low as possible.

withTarragon

04-03-2011, 09:12 AM

I guess my advice is a bit different from the others. I owned the 2360s for about two years and used them in a 2-way system (folded horn bass bin). I used both the JBL 2445 and 2446 drivers. These are 2 inch throats and both sounded fine. You will of course need CD compensation (boost the HF ocatves). I would not use a 1.4 throat (even with an adaptor).

The thing I found is that if you cross them at 500Hz or so, there is a harshness in the sound. My assumption was that you are trying to force too much air through the vertical diffraction slot. If you can cross them at 700-800Hz (and cross them steeply) you will have better luck.

vernb

04-04-2011, 01:48 AM

I also had 2360 horns and found them absolutely fantastic. I only sold them because I don't have a big enough room anylonger. I used JBL 2450 driver on them, and it was a perfekt kombination.

richg101

05-27-2011, 02:20 PM

Welcome to the 2360 club! There are a handful of us here that really love these things.

Keep us up on what you get for drivers, if you want the C.D. compensation curve I will find it for you.

please can someone describe the eq curve i should apply to the horn, loaded with JBL 2450J on 2360a horn. I use a JBL dsc260 so can apply the curve on this.

cheers guys!

1audiohack

05-27-2011, 02:24 PM

I will post it tonight after work if someone doesn't beat me to it. It's out there somewhere but I forgot where.

richg101

05-27-2011, 02:28 PM

kartsmart

05-27-2011, 09:08 PM

thanks man. i will use with some supertweeters, but for now will use the cd curve if you can provide it to me, and also boost the 12-16khz band a bit via the dsc260. im guessing the passive network for a 2450j to 2405 'babybum' wont be very large or expensive to build? anyone built one? are we looking at 8k crossover freq or higher?
I am working on a similar project and would also like to passive network for 2404 'babybum' . Not to hijack the treand , but how would the E-145 or the 2240 work below the horn ? with subs

1audiohack

05-27-2011, 09:47 PM

The white trace is a transfer function measurent from a JBL M552 crossover with the 2360 comp curve enabled. The yellow trace is the T.F measurement from a DBX crossover with the EQ set as follows;
630Hz -4.5dB
800Hz -4.5dB
1kHz -4.5dB
1.2kHz -4.5dB
1.6kHz -4.0dB
2kHz -3.5dB
2.5kHz -3.0dB
3.1kHz -3.0dB
4kHz -2.5dB
5kHz -2.0dB
6.3kHz-1.5dB
8kHz -1.0dB
10khz 0.0dB
12.5kHz+2dB
16kHz +3dB

Just a shot of the DBX screen for reference.

richg101

05-30-2011, 02:37 AM

thanks for this man. I have started inputting this (translated) into my dsc 260. instead of having the graphical 'bars' like your driverack i am having to use a series of bell shaped eq's set at similar points to yours, but having to set the width's in octaves. or typically 1/3 octaves. not gonna be exact, but close im hoping.

is the 3db boost at 16khz part of the bi-radial eq curve on the 552 unit?

thanks again!:)

1audiohack

05-30-2011, 07:23 AM

is the 3db boost at 16khz part of the bi-radial eq curve on the 552 unit?
thanks again!:)

It may be, I had both the DBX and M552 at unity or zero gain when I did this if I remember correctly. I think it's just relative, if you wanted to EQ cut only you could just start at -7.5 dB at 630 and 800 Hz and so on and end up at 0dB at 16kHz. The ripple at the end of the yellow curve comes from the DBX graphic EQ ending at 16kHz.

In my experience this curve does not get the 2360's frequency response flat, but it is much closer and sounds much better with this EQ curve applied.

As for using a tweeter like the 2404 passively I have used the JBL 3106 or it's twin the N8000. These are easily built as they are a simple 12dB at 8kHz two way network. Getting a tweeter properly integrated for critical listening with a 2360 is really tough, if not technically impossible, at about 16" between driver centers and some 20 wave lengths off in depth at 8kHz if the leading edges of the mouths are in the same plane, it doesn't make sense to build an elaborate network. For what it's worth, I think the use of a tweeter like the 2404 or 2405 is an improvement even with the afore mentioned challenges. I like it best with the tweeter between the MF driver and 2360.

Active with signal alignment is the best alternative.

I will be interested to see what you work out.

All the best,
Barry.

loach71

05-30-2011, 07:34 AM

Why not invest in some active crossovers, small power amps and a 1/3 octave EQ, with a 1/3 octave RTA and calibrated mike? I have these horns and have found the RTA doesn't lie...

richg101

05-30-2011, 02:01 PM

My dsc260 will allow time alignment for the units. I have 2 free outputs left on the dsc260 so could send a 8khz+ signal to some 2404 units powered from a small amp. however, i am of the belief that time alignment is less critical at the MHF/VHF. as long as the integration between the large format 2" and the 2206 drivers is ok i'll be happy if the VHF is slightly out of time alignment by 500mm or so.

im not worried about the slight phase issues, efficiency drop, distortion and time alignment issues associated with a passive network at the 8k crossover point. ideally id like to see if the 2" comp will go high enough for me to use without a VHF driver.

I'll let you know how I get on.

1audiohack

05-31-2011, 04:46 PM

Just curious, how difficult is it to find a Crown / Amcron D45 in your neck of the woods? They make great tweeter amps, no power on / off transients, (I run tweeters on mine without protection caps), and D45's are dead quiet. Over here they're inexpensive, new or used.

Do you by chance know what diaphragms are in your drivers? You may like the 2360's without tweets, to me it looks like the 2451 is about done being nice by 8kHz.

1audiohack

05-31-2011, 06:45 PM

I am working on a similar project and would also like to passive network for 2404 'babybum' . Not to hijack the thread, but how would the E-145 or the 2240 work below the horn ? with subs

E-145's? Sure. 2240 might be a stretch, but I never tried them as a D.R. up that high.

kartsmart

05-31-2011, 07:11 PM

E-145's? Sure. 2240 might be a stretch, but I never tried them as a D.R. up that high.

Tring them right know with 2240s D.R and I think its a strech. have not Eq properly yet so I dont know. I have a nice pair of 4628B and might try the horns on top of these, It would give me the E-145s and a pair of 2404s with 2505 phrams .I think the E145s with the 2245 subs would make a killer bottom end. what do you think ? :blink:

1audiohack

05-31-2011, 10:24 PM

I do think so, I just keep coming back to 15's for mid bass and 18's for subs. As long as the 2245's will run hard enough for you that combination set up properly should sound great.

kartsmart

06-01-2011, 05:27 AM

I do think so, I just keep coming back to 15's for mid bass and 18's for subs. As long as the 2245's will run hard enough for you that combination set up properly should sound great.

I tried to EQ the horns as you outlined with the DCX 2496 and seems I missed the target didnt sound right it was better with no eq . I will try my driverack 260 and audio eq and see what I get , don't know the history of the diaphragms 2441maybe they are wore out ? thanks for your intrest

1audiohack

06-01-2011, 06:57 AM

I've been round and round with drivers and diaphragms on my 2360's now and have reached a conclusion that suprized me, the D8R2450 diaphragm sounds the best to me compared to the D16R2441 or the D16R2445.

It's funny, the first pair of 2360's I got had 2445's on them and they sounded great. I bought more drivers (2446's and 2441's) and more 2360's and some went in the shop and some on the patio. For along time I didn't look in the drivers as they sounded, and measured very much alike but the 2445's were always the winner so they stayed in the house. When I finally got around to inspecting them, the 2441's and the 2446's had D16R2445's in them, the 2445's had D8R2450's in them. Later I bought a bunch of 2441's that all had D16R2441's in them. These I have not liked on the 2360's as well. I'm still working to figure it out and I have some ideas now. I haven't yet put the D8R2450SL's or the TruExtent's in them however.

Let me know how the auto EQ works out, I pretty much forgot about that feature. Another thing I have not really figured out, I have DBX260's as well and I have never liked the resulting sound when using parametric EQ compared to graphic EQ no matter what the measurements depict, any ideas on that?

grumpy

06-01-2011, 08:14 AM

I also found the ribbed Ti dia's sounded more pleasing in a 2-way 2360 setup...
may be fakey/hashy/tweety sounds, but it was less dull and sounded pretty good.

I haven't tried the Be back in the 2" exit drivers (moved to 1.5" exit units) and the
2360's are in the garage. I did think that would be interesting to try. My guess is
they might not sound as extended, but would be smoother and more natural sounding
(guess based on going from ribbed Ti to SL to Be using 2446 cores on Emilar horns)

p.s., did you try an A/B between PEQ and GEQ using the same freq's, Q's, and cut/boost levels?
It's easy to over do PEQ 'corrections' esp heavy Q settings.

badman

06-01-2011, 12:10 PM

I tried to EQ the horns as you outlined with the DCX 2496 and seems I missed the target didnt sound right it was better with no eq . I will try my driverack 260 and audio eq and see what I get , don't know the history of the diaphragms 2441maybe they are wore out ? thanks for your intrest

You may be hearing the difference between constant directivity and exponential profiles- the CD tends to sound brighter, when EQ'd flat. This is due to the constant dispersion within the treble. For a flat on-axis response, a "normal" horn with it's narrowing pattern will radiate less energy into the room with increasing frequency, whereas the total energy stays constant in a CD horn so you get more reflected high frequencies (again, relative to an exponential profile, and given a nominally flat frequency response).

Earl Geddes who uses CD horns prefers a falling frequency response as the best method for handling this issue without sounding bright. I tend to agree, a 2 dB slope down from 1k to 10k goes a lot for taming the bright top end.

kartsmart

06-02-2011, 11:57 AM

Earl Geddes who uses CD horns prefers a falling frequency response as the best method for handling this issue without sounding bright. I tend to agree, a 2 dB slope down from 1k to 10k goes a lot for taming the bright top end.

I did a auto EQ with a S slope that would be like As 2db slope as described and a + spike from 10K on up, sounded much better. next I will try E145s and 2404

kartsmart

06-06-2011, 06:42 PM

I did a auto EQ with a S slope that would be like As 2db slope as described and a + spike from 10K on up, sounded much better. next I will try E145s and 2404

I setup the horns on top of the 4628s ,running the 2240s 25 hz 12db LR cutoff to 50hz 6db to help out the bottom end of the E145s , E145 from 50hz 6db roll off to 600hz 12db LR , and 600hz 12db LR for the horn and it sounds a lot better.
now I would like to work in the 2404s, can they be 6db passive off the horns ? looking forward to some feed back on this part thanks :blink:

Lee in Montreal

06-08-2011, 01:54 PM

I am kinda in the same train.

2445 on 2350 horn - 111db sensivity
2405 crossed at 8kHz - 105db sensivity

Basically, I want to build a 24db network (no dephasing) and I know I will end-up with way too much mids. Any recommendation for a quality L-pad that doesn't cost an arm and a leg? I will probably need -12bd to -6db adjustment.

Anything I can get from www.Solen.ca ?

Mr. Widget

06-10-2011, 08:41 PM

Any recommendation for a quality L-pad that doesn't cost an arm and a leg? I will probably need -12bd to -6db adjustment.Why not build a fixed value pad? You can even build two or three different pads and have a toggle switch with which to select the level of attenuation.

Widget

kartsmart

06-11-2011, 12:42 PM

Why not build a fixed value pad? You can even build two or three different pads and have a toggle switch with which to select the level of attenuation.

Widget

that sounds like a good idea

Lee in Montreal

06-11-2011, 05:15 PM

Curious as what type of L-pad is best.

Serie + parallel resistances?
Serie resistance?

http://www.sengpielaudio.com/calculator-Lpad.htm

grumpy

06-11-2011, 07:06 PM

A series-only variable resistor will allow you to change
the driver volume, but will change what any network
placed before it sees resistance-wise also.

For example, if a passive high pass filter precedes the
variable resistor and driver, changing the resistor from
zero to a higher value will shift the response of the
filter, perhaps significantly changing the crossover
frequency.

Using an L-pad keeps the resistance seen by the
preceding passive filter somewhat constant, therefore
minimally affecting its intended response.

Mr. Widget

06-11-2011, 09:12 PM

Using an L-pad keeps the resistance seen by the preceding passive filter somewhat constant, therefore minimally affecting its intended response.Absolutely... and that is what I meant by a fixed pad... a fixed value L-Pad as opposed to variable one. There are several good calculators available on line to help you pick the correct values.

Widget

kartsmart

06-15-2011, 05:10 AM

now I would like to work in the 2404s, can they be 6db passive off the horns ? looking forward to some feed back on this part thanks :blink:[/QUOTE]
now that I have the E145s in place and sounding good , I now have the 2404s up and running . crossed over at 9K 48 db LR . have not had much seat time yet but I think it sounds much better. I seemed to remove a lot of nastys that was there with the upper end of 2360 horns (using 2441 diaphragms ) :applaud:

Lee in Montreal

06-15-2011, 05:44 AM

now I would like to work in the 2404s, can they be 6db passive off the horns ?

http://www.ajdesigner.com/crossover/crossoverfirst.php

And an Lpad to attenuate the mids?
http://www.sengpielaudio.com/calculator-Lpad.htm

kartsmart

06-16-2011, 08:32 AM

Is there a card just for the 2360A horns If so what would it be ?

1audiohack

06-16-2011, 09:10 AM

In the M552 and M553 the CD comp correction is built in and switchable, under the top cover are a bunch of mini switches, the owners manual gives the switch position configuration for the 2360, the 2380 or flat.

kartsmart

06-16-2011, 05:42 PM

1audiohack

06-16-2011, 08:01 PM

does this unit do A good job , Is is analog ?

I think so, they are analog and are dead quiet. No signal delay for driver alignment however.

kartsmart

06-17-2011, 06:07 AM

I think so, they are analog and are dead quiet. No signal delay for driver alignment however.

can the M553 3way cross over high enough 8-10K for the use of 2404s and use the eq comp. in the mid section for the 2360s or no ?

kartsmart

06-19-2011, 06:22 AM

now that I have had some seat time , I have found the xover point moved from 500hz up to near 700 sounded better on my system. the upper end is now crossed over at 8k sharply with 48 db .
In all I think the system sounds very good , good sound stage , good balance.

I'm thinking if the M552 passive xover and eq, then add a passive xover between the big horns and the baby cheeks could be a huge improvement

Lee in Montreal

06-19-2011, 06:36 AM

Have I missed the pictures of your installation? :D

kartsmart

06-19-2011, 06:54 AM

Have I missed the pictures of your installation? :D

soon

kartsmart

06-23-2011, 06:09 PM

can the M553 3way cross over high enough 8-10K for the use of 2404s and use the eq comp. in the mid section for the 2360s or no ?

Stereo Mode:M552: Low/High: 180 Hz to 2 kHz, (18 to 200 Hz) (switchable from back panel)
M553: Low/Mid: 180 Hz to 2 kHz, (18 to 200 Hz) (switchable from back panel), Mid/High: 450 Hz to 5 kHzMono Mode:M552: Low/Mid: 180 Hz to 2 kHz (18 to 200 Hz), Mid/High: 800 Hz to 9 kHz
M553: Low/LoMid: 180 Hz to 2 kHz (18 to 200 Hz), LoMid/HiMid: 450 Hz to 5 kHz, HiMid/High: 800 Hz to 9 kHz

kartsmart

06-26-2011, 01:43 PM

I moved the 2404s Inside the horns 6" down centered from the top side and 4" back inside the horn. The sound stage was much better and found It sounded better with a higher xover (8k to 10k) but still did not sound just right , It seemed that the location of the baby cheeks was blocking some sound reflection from the upper wall of the large horn .
then mover the 2404s down to the lower side , yes much better :bouncy:

next I wish I could build A passive Xover and eq for the 2 horns ,
would a eq filter like we used for the 2241a horns

lgvenable

06-26-2011, 03:05 PM

I'm running them too, using 2206's, 2360a-2445J, and 2404H'S, all equalized by a dBX DR260. 1Audiohack, I'm supposing thats the curve you use on your DR260?

I use three AB Systems 713 mon-tri-amps to drive this combo as my front channels. Topping that off have two 4546b subs each with a 2242H, driven by a BGW 750B bridged to mono.

Since you got your out of a studio, interesting. I got mine from a theater in Kentucky; and another 8 2445J's from the Chicago Museum of Science and Technology a couple of years early. I had found bi-radial horns to use, when the 2360's fell in my lap for a pittance.Their purchase out of in Kentucky felt like a steal; since they were $40.00 each for 4 2360a-2445J combos.;)

1audiohack

06-26-2011, 03:30 PM

I'm running them too, using 2206's, 2360a-2445J, and 2404H'S, all equalized by a dBX DR260. 1Audiohack, I'm supposing thats the curve you use on your DR260?

The screen pic is of the DRPA in the shop system. It has been upgraded to a DR260 since. I didn't do a T.F. of the curve as input in the 260, it sounds close enough for a 13500 square foot shop. The patio system also has the same config, I should check it sometime however.

richg101

07-02-2011, 01:13 AM

http://img802.imageshack.us/img802/8381/img3810a.jpg

http://img69.imageshack.us/img69/7900/img3837m.jpg

BOOM!

maxwedge

07-02-2011, 07:33 PM

Those are odd ball cabs.:blink:

Mr. Widget

07-04-2011, 09:31 AM

I'd say boom pretty much says it all!

Cool looking system.

Widget

Eaulive

07-04-2011, 11:16 AM

Triple 12"?
2206?

odd... original JBL or DIY?

stephane RAME

07-04-2011, 12:54 PM

Another example with three 14" speakers

http://www.jblpro.com/catalog/general/Product.aspx?PId=210&MId=2

Stéphane

Lee in Montreal

07-04-2011, 02:19 PM

odd... original JBL or DIY?

With all these ports, the cabinet must be tuned to something over 100Hz :D

richg101

07-04-2011, 03:16 PM

cabs are tuned to about 50-65hz. each 2206h has its own separate chamber. top 2206 driver is run up to meet the horn. the lower two 2206 running up to 120hz.

As anyone with expereince with the 2206 will tell you, even tuned to around 50-65hz an array of this many of them will murder anything of similar size, weight and power capacity. when running a compact system full range. each cabinet will handle the 1500wrms out of the MPX1200 (at 2.6r). I hope to augment the system with a pair of PD2450 each side to handle 90hz and below in the near future.

richg101

07-04-2011, 03:18 PM

PS. the cabinets are 3/4" 13 laminate birch ply, carpeted. built by a pro touring company back in the mid 90's. amazing cabs

pos

07-04-2011, 03:40 PM

I hope to augment the system with a pair of PD2450 each side to handle 90hz and below in the near future.
I saw that this fabulous driver is back on the market.
Legend has it that they somewhat broke the mold for the basket 1 or 2 years ago, and were not decided to rebuild one. They also have a Nd version now (surely more PA friendly, as the ferrite version weights 36kg!).
I was thinking about replacing my 2245H with these, and use them up to 150 or 200Hz, with a sharp crossover.
Looking at the response and impedance graphs it looks like the first problems appear around 300Hz.

http://www.precision-devices.com/asps/uploads/super/17.pdf

Do you have experience with this driver?

richg101

07-05-2011, 09:00 AM

I have a bit of experience with the PD2450 (ferrite). It is an extremely good driver. as far as sub and bass is concerned, the 2450 has a quick response as a good 15" woofer imo. As a guide, i have heard a pair of large 2450 loaded reflex cabinets against a pair of double 2226 loaded reflex cabinets side by side. I'd say if anything the 2450 was quicker due to the single cone.

I have also heard the same pair of 2450 cabinets in a trance night (unknowingly at the time). it sounded so fast and responsive, but with a effortness hard to describe. these were running underneath some dual 18Sound 10" + BMS compression driver and the integration was sublime - the 2450's were quick enough to meet the 10" drivers with ease.

finally, I would recommend getting the 4ohm version - they make them to order anyway. makes amp choice easier due to being able to run a nice big 2r stable amp like the macrotech 3600vz or MPX1200 bridged into each driver for massive dynamic headroom. - the drivers have a massive stroke, not that you ever need to make the cones move!

I saw that this fabulous driver is back on the market.
Legend has it that they somewhat broke the mold for the basket 1 or 2 years ago, and were not decided to rebuild one. They also have a Nd version now (surely more PA friendly, as the ferrite version weights 36kg!).
I was thinking about replacing my 2245H with these, and use them up to 150 or 200Hz, with a sharp crossover.
Looking at the response and impedance graphs it looks like the first problems appear around 300Hz.

http://www.precision-devices.com/asps/uploads/super/17.pdf

Do you have experience with this driver?

pos

07-05-2011, 12:59 PM

Do you know the crossover freq that was used in the system with the 10" beyma driver ?
Concerning the amp, I will use a MC2 MC1250

richg101

07-05-2011, 01:41 PM

Do you know the crossover freq that was used in the system with the 10" beyma driver ?
Concerning the amp, I will use a MC2 MC1250

i think he said 110hz., but it sounded like it was playing higher... an MC1250, bridged into a 4r PD2450 id imagine will be ideal

pos

07-05-2011, 01:55 PM

kartsmart

07-05-2011, 03:25 PM

I would use a pair of 2450, up to 150 or 200Hz crossed over to a TAD TM1201H.
I prefer to stay with a 8ohm version to take advantage of the highest possible damping factor.
Have you heard the JBL 2245H? How do you think they'd compare in a 30Hz-200Hz application?

Just added 2-2245H each in 226L ported boxes xo at 80HZ to a E145 XO at 700 I must say it makes A great bottom end ,very pleased :applaud:. I see they are using them up to 300HZ in the 4355s

pos

07-05-2011, 04:00 PM

I am currently using a pair of 2245H in 4645 cabs (same size as yours) in this 30-200Hz application, but I am really tempted by these 24" monsters.

kartsmart

07-06-2011, 02:40 PM

I am currently using a pair of 2245H in 4645 cabs (same size as yours) in this 30-200Hz application, but I am really tempted by these 24" monsters.

If its a stretch to get a 18" driver to 300 hz , A 24" ?? could it be done ?? :blink:

lgvenable

07-06-2011, 06:20 PM

I am currently using a pair of 2245H in 4645 cabs (same size as yours) in this 30-200Hz application, but I am really tempted by these 24" monsters.

Same cabinets, just filled with 2242's at 8 ohm

pos

07-07-2011, 02:36 AM

If its a stretch to get a 18" driver to 300 hz , A 24" ?? could it be done ?? :blink:
If the cone is rigid enough (push the breakups higher in frequency) and dampened enough (lower the Q of the breakups) then it can be done.
The PD2450 has ribs (unlike the "smaller" PD2150) that help rigidity and a heavy cone that looks quite dampened. The impedance curve also looks good up to 250Hz (better than most of their 15" look up to 500Hz: http://www.precision-devices.com/PD09_product_cat.pdf).