how to calculate resonance freq in H-baffle - 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 13th January 2009, 11:00 PM   #1
bvan is offline bvan  Denmark
diyAudio Member
 
Join Date: Apr 2006
Default how to calculate resonance freq in H-baffle

Can anyone tell me how to work out how deep(front and back of the driver plane) I can make the sides of an H-baffle before I need to start worrying about resonances. I'll likely run the subs as high as 250hz and shelve the 24db/oct above that. Thanks
  Reply With Quote
Old 14th January 2009, 03:43 AM   #2
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
http://www.audioasylum.com/forums/hu...13/139455.html

"I was expecting it to take some time to get aquainted with the way that it sounds but I knew within seconds that it was what I wanted. It's cleaner , faster and the kind of bass that usually comes from servo systems. I'm even able to drive the woofers much harder before cone break up.
My actual tuning came out to 33hz. and they sound very linear up to 400hz. Thanks "
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 14th January 2009, 08:49 AM   #3
bvan is offline bvan  Denmark
diyAudio Member
 
Join Date: Apr 2006
Looks like a good design, but I'm thinking dipole subs might match better with dipole mains, having similar radiation patterns and all?

I've heard of quarter wavelength resonances, and can work out what this translated to (about a foot), but I'm not sure if it's half, quarter, eighth etc that I should be concerned about.

cheers
  Reply With Quote
Old 14th January 2009, 02:58 PM   #4
Rudolf is offline Rudolf  Germany
diyAudio Member
 
Rudolf's Avatar
 
Join Date: Mar 2003
Location: Germany
Quote:
Originally posted by bvan
I've heard of quarter wavelength resonances, and can work out what this translated to (about a foot), but I'm not sure if it's half, quarter, eighth etc that I should be concerned about.
It is the quarter wavelenght (distance from driver plane to either opening). The effective wavelenght will be a bit longer than the geometric dimension. If you shelve below that with 24 dB you don´t need to bother about the higher resonances at all.
__________________
www.dipolplus.de
  Reply With Quote
Old 14th January 2009, 03:53 PM   #5
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
"Looks like a good design, but I'm thinking dipole subs might match better with dipole mains, having similar radiation patterns and all?"

By all means, try the dipole. The basic idea may be adapted to sealed, vented, and dipole. Mine have always been 6th oder vented.

The primary limit on HF response is the depth of the plenum, and the cavity formed by same. The back corners of the cavity can be filled with 703 fiberglass if you like. I think if you keep dimensions to a minimum and cross at 24dB that you will have no problems. I have successfully crossed 18s over at 250hz in a couple of my designs.
__________________
Candidates for the Darwin Award should not read this author.
  Reply With Quote
Old 14th January 2009, 10:52 PM   #6
bvan is offline bvan  Denmark
diyAudio Member
 
Join Date: Apr 2006
thanks djk
  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
Tapped Horn and Driver resonance Freq. Bent Subwoofers 44 17th April 2009 11:05 AM
Baffle cutoff freq for N baffle mashaffer Subwoofers 1 25th June 2007 05:29 PM
how to calculate resonance in dipole H-frame? thadman Subwoofers 4 17th April 2007 08:10 PM
How to kill a 100Hz open baffle resonance? Katapum Full Range 12 22nd November 2005 03:51 PM
How to calculate baffle step? henriksommer Multi-Way 11 7th May 2004 07:16 AM


New To Site? Need Help?

All times are GMT. The time now is 03:55 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