Possible PRV 12", wild burro combo OB? - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 3rd September 2012, 11:37 PM   #1
diyAudio Member
Join Date: Sep 2012
Location: Costa Rica
Default Possible PRV 12", wild burro combo OB?

Hi Guys,

I know "there ain't no substitute for cubic inches" for an Open Baffle woofer, but I can probably get these locally, and I have a WAF issue as far as space is concerned in our den. I am thinking of a 15" baffle with 8" 90% wings at the bottom, tapering to about 4" where the Wild Burro Betsy would be mounted following the golden ratio of .6 from one side to 1 on the other to 1.6 from the top. (Haven't calculated exact dimensions yet.)

Here is a link to the woofer:


Probably best to use a plate amp and my home theater receiver to cross at around 100 hz. (Seems easier than trying to do it passively)


1. Would there be any advantage, using only one per side? I am thinking cleaner midrange and more volume before excessive distortion.

2. Would mounting it near the floor give me a little more "oooompf"
  Reply With Quote
Old 4th September 2012, 01:24 AM   #2
diyAudio Member
Join Date: Dec 2011
Location: MO
From my experience, the 12" has a much too low of an xmax to be used for OB. A high excursion woofer - anywhere between 10 to 20mm would be much better. Most I've seen use either 1 15" woofer or 2 12s - per side.

To answer your two questions - I'd use two 12's per side mounted in a W-frame, much like Gainphile's newest build (Gainphile: S19 4-Way Dipole Radiator) and even the newest incarnation of the Orion uses 2 12" woofers in a W-frame. Also - mounting near the floor is a must if you're limited on excursion/diameter capabilities.
  Reply With Quote
Old 4th September 2012, 01:47 AM   #3
diyAudio Member
Join Date: Nov 2005
I doubt the efficiency claimed below 100Hz with a nearly 70 gram <10" diameter moving assembly, but that isn't so important with an extra amplifier, and you'll never get the 2.5" coil hot before running out of excursion open baffle. Looks like a good OB candidate T/S wise. Adding a pair per side only gets you another 3dB.
  Reply With Quote
Old 4th September 2012, 02:37 AM   #4
diyAudio Member
norman bates's Avatar
Join Date: Nov 2003
Location: iowa
with that small of a baffle, the betsy will roll off far above what you need for a 100hz crossover point.
  Reply With Quote
Old 4th September 2012, 01:29 PM   #5
diyAudio Member
Join Date: Sep 2012
Location: Costa Rica
OK, guys, thanks for the help. What I think I am getting here:

Sirius815: need at least 2 for sufficient xmax.

Andrew: May work because of extra amp.

Norman: Baffle is too small for 100hz crossover. Looks like I need to use a spreadsheet to see where to cross and maybe rethink the design depending on the highest crossover point available on my JVC receiver.

Will it matter how far away the woofer is from the full range? There is a point where center-to-center spacing becomes too great and you can hear individual drivers instead of a coherent whole, but I am not sure how to calculate that.

Thanks again. Any more thoughts would be very welcome.
  Reply With Quote
Old 4th September 2012, 11:19 PM   #6
diyAudio Member
Join Date: Dec 2011
Location: MO
**By two, I didn't mean the two you had picked out. I think you'd need closer to 4 per side of the PRVs.

For the distance center to center - I think it was no more than a 1/4 wavelength apart.
  Reply With Quote


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
Wild Burro Field Coils! pjanda1 Wild Burro Audio 25 15th September 2013 01:03 AM
Wild Burro Audio Betsy OB pair bigaudioscotto Swap Meet 1 20th December 2011 10:10 AM
Wild Burro Betsy with Plugs. bigaudioscotto Full Range 5 10th October 2011 09:16 PM
Wild Burro Onken nesha Full Range 58 14th March 2011 11:24 AM
Wild Burro Lab pics pjanda1 Wild Burro Audio 17 12th November 2010 05:28 PM

New To Site? Need Help?

All times are GMT. The time now is 01:40 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2