Precision Devices 12" woofers

[Defo]

Do anyone have any experience with these woofers? They seem to have pretty good bandwidth. Espesially these two:

http://www.precision-devices.com/showdetails.asp?id=70

and

http://www.precision-devices.com/showdetails.asp?id=9

[Inductor]

You want to use a 50's Hz/Fs as a woofer? How, with a horn? I would give a try with the first speaker as a mid(/woofer) and/plus a sub(/woofer). It looks good on paper.

[Defo]

Originally posted by Inductor
You want to use a 50's Hz/Fs as a woofer? How, with a horn? I would give a try with the first speaker as a mid(/woofer) and/plus a sub(/woofer). It looks good on paper.

More for midwoofer duty. I use a subwoofer.

The interesst for the extended bandwidth is to be able to cross around 1800 hz to a small 1000hz tractrix horn coupled with a B&C DE25, to match dispersion.

[AndrewT]

Precision Devices seem to somehow add 1mm to the Xmax value for both the drivers you listed.

The one that is listed as 2.6mm (12MH25) may be nearer 1.6mm when measured by the method other manufacturers use.

This is a mid driver don't expect it to perform loud down to 60Hz.

[Inductor]

I don't want to distract you from your projects but also test (no xover on the woofer, or a first order for BSC) it against this tweeter at 4K xover as (it) is here, with this cap. (1. order):
http://www.lautsprechershop.de/pdf/fostex/ft96h.pdf

or this should work fine (more margin for xover):
http://www.lautsprechershop.de/pdf/fostex/ft17h.pdf

[Defo]

Originally posted by AndrewT
Precision Devices seem to somehow add 1mm to the Xmax value for both the driver you listed.

The one that is listed as 2.6mm (12MH25) may be nearer 1.6mm when measured by the method other manufacturers use.

This is a mid driver don't expect it to perform loud down to 60Hz.

Hmm, I see. 1,6mm is a bit too low. What exacly happens when you run a driver out of xmax? Cant be as bad as running out of xmech...

How about the latter driver? Will it be able to go as high as 1,8 khz, and do it good? Kind of hard to tell without off axis measurements I assume?

[Inductor]

Originally posted by Defo


Hmm, I see. 1,6mm is a bit too low. What exacly happens when you run a driver out of xmax? Cant be as bad as running out of xmech...

You said you have another woofer (as a sub), so what's the problem with this one as a mid?

[Defo]

Originally posted by Inductor

You said you have another woofer (as a sub), so what's the problem with this one as a mid?

From my simulations it runs out of xmax at around 75 watts, and 114db. Im sceptical to that, as my spl requirements are quite high, and I dont want to run my subwoofer as high as 100hz.

[Inductor]

There are a few drivers that can go w/high SPL at those freq. 97/100dB (10", 12") like Volt, Selenium, ask if you need help. A new (very) small driver that needs some testing is the Beyma 6P200Nd. Look also at Beyma SM108/95dB (10") and 8LW30/96dB (8"). Another member also mentioned the Precision PD.8BM20/92dB (8").