Precision Devices 12" woofers - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th July 2009, 09:38 PM   #1
Defo is offline Defo  Norway
diyAudio Member
 
Join Date: Nov 2008
Default Precision Devices 12" woofers

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
  Reply With Quote
Old 29th July 2009, 11:07 PM   #2
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
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.
  Reply With Quote
Old 29th July 2009, 11:20 PM   #3
Defo is offline Defo  Norway
diyAudio Member
 
Join Date: Nov 2008
Quote:
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.
  Reply With Quote
Old 29th July 2009, 11:42 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
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.
__________________
regards Andrew T.
  Reply With Quote
Old 29th July 2009, 11:54 PM   #5
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
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
  Reply With Quote
Old 29th July 2009, 11:56 PM   #6
Defo is offline Defo  Norway
diyAudio Member
 
Join Date: Nov 2008
Quote:
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?
  Reply With Quote
Old 30th July 2009, 12:05 AM   #7
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
Quote:
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?
  Reply With Quote
Old 30th July 2009, 12:38 AM   #8
Defo is offline Defo  Norway
diyAudio Member
 
Join Date: Nov 2008
Quote:
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.
  Reply With Quote
Old 30th July 2009, 01:05 AM   #9
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
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").
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Precision devices...... Village Plank Multi-Way 10 14th December 2008 07:49 PM
Precision Devices PD.158 Xmax? buggsson Subwoofers 6 20th May 2008 06:55 AM
Precision Devices tinitus Multi-Way 1 8th January 2008 12:57 AM
Compact 15" sub - BMS or Precision Devices? DIAR Subwoofers 7 4th January 2007 04:06 PM
Precision devices KevinTams Subwoofers 111 22nd December 2005 02:41 PM


New To Site? Need Help?

All times are GMT. The time now is 07:32 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2