Software to model downfiring 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 12th March 2006, 03:03 PM   #1
Paul W is offline Paul W  United States
diyAudio Member
 
Paul W's Avatar
 
Join Date: Oct 2003
Location: North Georgia
Default Software to model downfiring woofer???

What software can be used to model the response of a downfiring woofer? I'm particularly interested in how the "slot" at the floor modifies higher frequency output. The slot may act as a low-pass filter but I'd like to better understand how it operates.
  Reply With Quote
Old 13th March 2006, 08:27 PM   #2
diyAudio Member
 
Join Date: Oct 2001
Location: 5280'
I bet you could model a bandpass design with the opening sized appropriately
  Reply With Quote
Old 13th March 2006, 11:08 PM   #3
diyAudio Member
 
Join Date: Jan 2005
Location: Rotterdam, NL
That's how I did it. It's a reflex so I modeled it as a 6th order BP with the first chamber/port equal to the reflex. The airvolume below the woofer being the 2nd chamber and the opening being the port. In my case I made sure that the tuning for the second chamber was well above the crossoverpoint as didn't wanted a 6th order BP.

The lack of distortion compared to normal reflex mounting is eminent. It can be crossed much higher without the ussual coloration of the sound that it used to have at different crossoverfrequencies in several enclosures. People standing next to it actually don't believe it's on, untill it's off.

A simulation will show a (24 dB) rolloff without return to axis, in practice it will be more of a (large) dip in the response.

Wkr Johan
__________________
Impossibilities we do immediatly, miracles take slightly longer.
  Reply With Quote
Old 18th March 2006, 05:55 AM   #4
Paul W is offline Paul W  United States
diyAudio Member
 
Paul W's Avatar
 
Join Date: Oct 2003
Location: North Georgia
Okay...thanks. I'll try that this weekend.
  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
Titanic MK3 downfiring sub Renron Subwoofers 6 27th March 2007 04:51 PM
Autocad 3d Model of any woofer driver? ANY? ssabripo Multi-Way 7 4th January 2006 02:04 PM
Where can I buy DYNAUDIO WOOFER DRIVER model MW150 aht Subwoofers 2 16th March 2005 07:33 AM
Canít get this Volt woofer to model. jonk Multi-Way 10 1st July 2004 05:31 PM
Upfiring or Downfiring? masterp2 Subwoofers 2 11th March 2002 11:58 PM


New To Site? Need Help?

All times are GMT. The time now is 11:55 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