Help with speaker simulation - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Software Tools SPICE, PCB CAD, speaker design and measurement software, calculators

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 30th January 2011, 11:12 AM   #1
steffda is offline steffda  Germany
diyAudio Member
Join Date: Feb 2010
Default Help with speaker simulation

I have tried to simulate the behavior of a loudspeaker. For that I have used the model from Micka (
For comparison, I've resorted to Kyle's Lahnakoski versions (Driver Analysis).
All things the results are not in the approach similar to the above in the published sources.

My question to the experts here: What's going wrong?

I am currently at a loss.

The first two pictures are the simulation of a speaker without box with qucs and the result.

The next four pictures are the simulation of a bass reflex box and the results.

Attached Images
File Type: gif LS-Simulation.gif (20.8 KB, 291 views)
File Type: gif LS-Resultat.gif (69.5 KB, 273 views)
File Type: gif BR-LS-Simulation.gif (40.2 KB, 271 views)
File Type: gif BR-LS-Resultat-SPL.gif (53.4 KB, 264 views)
File Type: gif BR-LS-Resultat-PePa.gif (47.1 KB, 264 views)
File Type: gif BR-LS-Resultat-UI-out.gif (50.7 KB, 47 views)
  Reply With Quote
Old 31st January 2011, 04:18 PM   #2
steffda is offline steffda  Germany
diyAudio Member
Join Date: Feb 2010
But I think I've found the error:
In the simulations I did Le = 0.47 * 10e-3, which is interpreted by qucs not as expected.
If I do Le = 0.47 * 10 ^ (-3) or set Le = 0.47 * 0.001 then the results are plausible and are consistent with those of Micka.
The current in the 2.7 uF capacitor accordingly corresponds to the course of sound pressure.
Some "play" with the parameters of the box then shows the curves that result with other box-simulations and other publications.

  Reply With Quote
Old 2nd February 2011, 06:36 PM   #3
steffda is offline steffda  Germany
diyAudio Member
Join Date: Feb 2010
So, I got it
Attached is a zip-file with a qucs-library for loudspeakers (just loudspeaker, closed box and vented box) and also a qucs-projekt with the schemes.
On the pictures is a 2-way-box simulation, just as example :-)

Attached Images
File Type: gif 2-way-box-simulation.gif (27.6 KB, 103 views)
File Type: gif 2-way-box-result.gif (63.0 KB, 100 views)
Attached Files
File Type: zip (5.0 KB, 50 views)
  Reply With Quote
Old 19th April 2016, 02:41 AM   #4
diyAudio Member
Join Date: Apr 2016
Thank you very much for this post, it's genius !
  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
speaker simulation software for Mac OSX rebojorge Multi-Way 24 17th January 2016 08:07 PM
Use Orcad for speaker / crossover simulation alexw88 Multi-Way 6 16th March 2011 03:08 PM
Speaker measurement and simulation software? Few Multi-Way 8 4th June 2004 08:31 AM
Spice - speaker load simulation Kees Solid State 4 8th September 2003 11:08 PM
Software speaker simulation weirdness jteef Multi-Way 6 12th January 2002 08:59 AM

New To Site? Need Help?

All times are GMT. The time now is 06:07 AM.

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