Help with speaker simulation
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steffda
diyAudio Member

Join Date: Feb 2010
Help with speaker simulation

Hi,
I have tried to simulate the behavior of a loudspeaker. For that I have used the model from Micka (http://micka.de/org/en/download/spice-tsp_en.pdf).
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.

Greetings
Steffen
Attached Images
 LS-Simulation.gif (20.8 KB, 296 views) LS-Resultat.gif (69.5 KB, 278 views) BR-LS-Simulation.gif (40.2 KB, 276 views) BR-LS-Resultat-SPL.gif (53.4 KB, 269 views) BR-LS-Resultat-PePa.gif (47.1 KB, 269 views) BR-LS-Resultat-UI-out.gif (50.7 KB, 49 views)

 31st January 2011, 04:18 PM #2 steffda   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. Greetings Steffen
steffda
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 :-)

Greetings
Steffen
Attached Images
 2-way-box-simulation.gif (27.6 KB, 107 views) 2-way-box-result.gif (63.0 KB, 103 views)
Attached Files
 qucs.zip (5.0 KB, 54 views)

 19th April 2016, 02:41 AM #4 Nibin diyAudio Member   Join Date: Apr 2016 Thank you very much for this post, it's genius !

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