Omega frame woofer - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 27th February 2008, 07:03 AM   #1
diyAudio Member
 
Join Date: Feb 2006
Location: Italy
Default Omega frame woofer

Trying to avoid “low frequency” T-line resonance in a W-frame dipole woofer I’ve thought about this type of configuration:


Click the image to open in full size.


Obviously overall dimension is not my problem..


I think that the only resonance will be the one between the parallel faces of the “woofer open box” but I also think that it will be a relative high frequency resonance due to the small dimension of the box itself..
  Reply With Quote
Old 27th February 2008, 06:38 PM   #2
diyAudio Member
 
Join Date: Sep 2006
Not sure if that will work the same way...I believe the W frame works by loading the drivers against the opposing walls and each other...
  Reply With Quote
Old 28th February 2008, 08:30 AM   #3
diyAudio Member
 
Join Date: Feb 2006
Location: Italy
Quote:
I believe the W frame works by loading the drivers against the opposing walls and each other...
Do you mean that could be a difference in the dipole axis pattern?
  Reply With Quote
Old 29th February 2008, 12:46 PM   #4
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Jaco,
the advantage of the lowered fs of a W-frame needs a tight "box" in front and back.
If you open up those "boxes" you will loose bottom frequencies at the same time. I wonder why you don´t change to a H-frame instead.

There is no resonance between the parallel faces of the loudspeaker mounting baffles. The only - and dominant - resonance is the lambda/4 reso of the T-line which is only slightly attenuated by opening up the outer sides.
__________________
www.dipolplus.de
  Reply With Quote
Old 1st March 2008, 08:03 PM   #5
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally posted by Jaco Pastorius


Do you mean that could be a difference in the dipole axis pattern?
My understanding is having the walls very close to the woofer lowers the QMS (mechanical due to loading) and lowers the FS...

The results is more power handling form the loading, a lower roll off, but a lower sensitivity as well...

If I remember correctly, it also lowers distortion according to Linkwitz...
  Reply With Quote
Old 4th March 2008, 07:55 AM   #6
diyAudio Member
 
Join Date: Feb 2006
Location: Italy
Hi all

Rudolf you are in right! I’ve expressed myself in a very wrong way (sorry but my English is terrible)

I’ didn’t want to say that the resonance is formed by the parallel faces! I wanted to say that the parallel faces form the t-line that creates resonance..

I now that the addiction of the air mass “trapped” between the tight boxes lowers the fs and so extends frequency response loosing spl but this is not my “goal”

I would like to reach these two features of the w-frame mounting:

1° forces cancellation

2° odd order harmonic distortions reducing by the reverse movement of the motors

and trying to reduce resonance..

I now that I can reach the second point with an h-frame, I’ve built one prototype recently, but I consider vibrations too strong..

Fast1one you are in right too.. I’ve have understand that you were talking about room walls not about cabinet walls..
  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
MJK’s Jordan JX92S OB with a Goldwood GW-1858 Woofer in an H Frame Jim Shearer Full Range 606 25th April 2012 11:11 PM
PE Buyout 6" shielded AL cast frame woofer AdamThorne Multi-Way 1 18th April 2008 11:28 PM
U-frame woofer design john k... Multi-Way 0 8th December 2006 05:15 PM
W-Frame or H-Frame dipoles? performace issues? JinMTVT Subwoofers 34 5th October 2006 04:44 PM
Dipole Woofer Array in Multiple W Frame? MartinQ Multi-Way 9 3rd August 2004 09:20 PM


New To Site? Need Help?

All times are GMT. The time now is 03:47 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