effects of nonlinear air compliance - 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 29th July 2005, 11:43 PM   #1
Zaph is offline Zaph  United States
diyAudio Member
 
Zaph's Avatar
 
Join Date: Sep 2003
Location: Wisconsin
Default effects of nonlinear air compliance

The Other John K, (i.e. the smarter one) just wrote a unique spreadsheet detailing the effects of nonlinear driver suspension compliance. I think he intended this to be the primary consideration for dipole design, but this basically shows in a little more detail why I generally prefer larger boxes for subs.

It's a neat sim that can show why placing a large Xmax woofer in a small box can cause distortion.

http://www.musicanddesign.com/driver_box.html

John
__________________
-Zaph|Audio-
  Reply With Quote
Old 29th July 2005, 11:51 PM   #2
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Thanks John,

This interests me as I've been advocate of build a smallish box using a large radiating area driver and then EQ down to the response you want.

Will try out some of the designs I have done and see how much effect this has on things.
  Reply With Quote
Old 31st July 2005, 07:28 AM   #3
mike.e is offline mike.e  New Zealand
diyAudio Member
 
mike.e's Avatar
 
Join Date: Sep 2004
Location: NZ
Send a message via ICQ to mike.e Send a message via MSN to mike.e
http://www.woodartistry.com/linkwitz...r-distortn.gif

http://www.woodartistry.com/linkwitzlab/thor-design.htm

In some situations its definately worth considering.(tiny boxes with huge woofers and huge input power,and high expectations)

I use a jbl2226 on a 200litre ported box,so its not a worry to me.
  Reply With Quote
Old 3rd August 2005, 07:29 PM   #4
MarkMcK is offline MarkMcK  United States
diyAudio Member
 
Join Date: Aug 2003
Location: Ohio
The test of a simulation is not whether it reifies one's prior beliefs but if it accurately predicts what happens and what matters in the world of experience.

As the USA shuttle program manager recently said, "All the wind tunnel tests and fluid dynamics simulations are not worth one test flight."

Simulations . . . be skeptical.

Mark
  Reply With Quote
Old 4th August 2005, 05:13 AM   #5
rcw is offline rcw  Australia
diyAudio Member
 
Join Date: Jul 2005
Location: sydney nsw
Default re distortion

Ricard Small coment in his paper on sealed boxs that if the volume displacement becomes more than a few percent of the total volume distortion starts to become significant.
  Reply With Quote
Old 4th August 2005, 10:37 PM   #6
mike.e is offline mike.e  New Zealand
diyAudio Member
 
mike.e's Avatar
 
Join Date: Sep 2004
Location: NZ
Send a message via ICQ to mike.e Send a message via MSN to mike.e
If it wasnt true,it wouldve been disproved by now - probably. With harmonic distortion measurement so easy now.

Comparing reality to simulation is always interesting - how much of an approximation is 'enough'
  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
Audibility of nonlinear distortion Pan Multi-Way 37 4th December 2008 07:41 PM
Dipole woofer nonlinear distortion gainphile Multi-Way 58 13th November 2008 02:54 PM
Suggestions on nonlinear ADC input CeramicMan Digital Source 2 11th February 2004 09:41 PM
computers to fix nonlinear speaker output? Nappylady Multi-Way 4 8th April 2003 10:21 PM
Nonlinear harmonic distortion vs. linear harmonics capslock Multi-Way 0 6th September 2002 09:40 AM


New To Site? Need Help?

All times are GMT. The time now is 10:23 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