Sound Card Calibration and Impedance Circuit

sm52

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Mar 14, 2019
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I have tried to get Thielle-Small parameters with the double added mass method. Made three measurements. But REW couldn't count. Using the one added mass method, both measurements with different weights allow approximately the same parameters to be calculated. Could you take my measurement files and check the calculation with the double added mass method? Diameter 12.2 cm, Voice Coil DC Resistance 3,36 Ohm
 

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sm52

New Member
Thread Starter
Joined
Mar 14, 2019
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40
"But REW couldn't count."
DC Resistance 3,36 Ohm. REW asks for a value of around 2.69. Why is it necessary to enter an unreal value? The second message says that my measurements are not correct. However, if you use these measurements separately for the single added mass method, everything counts fine.
 

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John Mulcahy

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Apr 3, 2017
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Dual added mass allows additional consistency checks. The added mass measurement results are not at all consistent with each other or the free air measurement, hence the very large Bl variation and the warning. Do not rely on any values you get from those measurements.
 
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