Estimation of vented-box parameters from impedance - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 1 Old 07-14-16, 02:34 AM Thread Starter
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Join Date: Jul 2016
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Estimation of vented-box parameters from impedance

Hi,

To accurately simulate the frequency response of a vented-box loudspeaker system, we need to know some "hard to find parameters" which are the Q losses (port, leakage and absorption losses) and the apparent volume of the enclosure (the one used to compute the box compliance).

REW allows to compute the T/S parameters from the impedance measurements but not the losses of a vented-box. I searched on the Internet if there was some softwares to do that but I did not find any.

So, I have developed scilab scripts to estimate these losses from the impedance measurements as well as the system tuning ratio and the system compliance ratio. Additionally, these scripts calculate the free-field frequency response based on measurement of the acoustical pressure within the enclosure. The measurements of the impedance and the acoustical pressure can be made with REW.

Scilab was a good candidate to test the method but scripts are relatively obscure program. From my point of view, it would be interesting to have this functionality on commercial products with GUI.

Interested people can find more details in the following link : http://www.volucres.fr/AudioHighEnd/...-parameter.pdf

Jean Fourcade
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estimation , impedance , parameters , ventedbox

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