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Old 23rd December 2011, 07:14 PM   #1
Rojoh is offline Rojoh  Norway
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Default What could be done with 8 Precision Devices PD12SB30?

Hello.

I'm lost for ideas of what to do with my 8 PD 12" woofers. I'm considering selling them, but will probably not get much for them. Therefore I wonder if they could play a more reasonable role in a second soundsystem. (They don't fit in my main system, since it already consists of dual JBL-2226 midwoofers/side - simply too smallish ).

I do want a second system coupled to the TV, and I have a miniDSP 2-ch. aktive crossover to feed the loudspeakersystem. Let's say I could build something for the 8 PDs from 80-120Hz, and down. (Or pehaps I could build something fancy, and get a better sale for a complete system, than for the individual drivers?)

My problem is that I'm not used to sim/manipulate such high EBP-drivers. What options do I have if I want SQ down to at least 30Hz? Preferably not crazy big enclosures.


Precision Devices International Limited
Fs 50.238 Hz
L1 0.999 mH
L2 1.773 mH
Res 87.286 Ohms
RMSE-load 0.905 Ohms
Qts 0.297
RMSE-free 1.718 Ohms
Qms 5.024
Vas 58.945 Litres
Qes 0.316
Mms 67.410 grams
Sd 530.93 sq cm
Cms 148.887 M/N
R2 8.105 Ohms
BL 19.228T/m
Xmax 7.00 mm
Re 5.493 Ohms

My initial idea is to build 2 separate enclusures with 4 woofers. 2 woofers facing forward, and 2 woofers facing backwards. Sealed and push/pull-coupled pairs. 2 ohms imp, but I think Hypex or proamps could do the job. EQed to desired response. What do you think about that idea?

Thanks.
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Last edited by Rojoh; 23rd December 2011 at 07:41 PM.
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Old 23rd December 2011, 07:50 PM   #2
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Four tapped horns?
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Old 23rd December 2011, 08:23 PM   #3
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Specs (apart perhaps from the high Vas) look good for 30 Hz THs.

A quick sim suggests that, if you can live with 6 cu.ft. sub boxes per sub, you could use four of them in 30 Hz THs, and the other four as midbass drivers in two/way tops.
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Old 25th December 2011, 05:32 PM   #4
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Default JBELL designed a cute lil sub for dance studios...

it is designed around a 12 incher.

sorry, I haven't found the link yet!

Merry Christmas!

Ben
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Old 25th December 2011, 07:51 PM   #5
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Rojoh View Post

I do want a second system coupled to the TV, and I have a miniDSP 2-ch. aktive crossover to feed the loudspeakersystem. Let's say I could build something for the 8 PDs from 80-120Hz, and down. (Or pehaps I could build something fancy, and get a better sale for a complete system, than for the individual drivers?)


My initial idea is to build 2 separate enclusures with 4 woofers. 2 woofers facing forward, and 2 woofers facing backwards. Sealed and push/pull-coupled pairs. 2 ohms imp, but I think Hypex or proamps could do the job. EQed to desired response. What do you think about that idea?
yes
isobaric 'clamshell'
2 woofers each box
with 8 woofers you have enough to build 4 'subs'
with EQ they would do fine as high power subs

or you could build 2 subs with double isobaric clamshell mounting
that might be something really special

btw, series/paralel combination would give you a better 5ohm load
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Old 25th December 2011, 07:56 PM   #6
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Holy crap! Yall are crazy!
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Old 25th December 2011, 09:52 PM   #7
epa is offline epa  Netherlands
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maybe you can sell them to reminence?
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Old 26th December 2011, 01:10 AM   #8
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Quote:
Originally Posted by tinitus View Post
yes
isobaric 'clamshell'
2 woofers each box
with 8 woofers you have enough to build 4 'subs'
with EQ they would do fine as high power subs

or you could build 2 subs with double isobaric clamshell mounting
that might be something really special

btw, series/paralel combination would give you a better 5ohm load
4 would be better than 2, as long as you have discrete level and delay control.
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Old 26th December 2011, 08:01 AM   #9
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Default epa - thatt's the link! :)

regards, Ben
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Old 26th December 2011, 05:27 PM   #10
tb46 is offline tb46  United States
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They seem to model fine as bjorno's T-TQWT, maybe 4 duals @ about 110 L_net each.

Regards,
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