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ZVX-8 Qts published not matching calculated

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Hi, I just picked up a ZVX8-D4, it will be here Monday. I'm working on modelling a box. I've tried 2 versions of WinISD and Speakerboxlite, both give me a different calculated Qts than the published. Is this normal? Am I doing something wrong?

Published: FS 41.8Hz, Qms 3.6, Qes 1.25, Qts 0.76
Qts calculated: 0.928

Published: FS 40.0Hz, Qms 7.60, Qes 1.15, Qts 0.72
Qts calculated: 0.999


Edited by elhabito
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Qts is a derived value. 1/Qts = 1/Qms + 1/Qes

With that said..... You're correct on there being a discrepancy. Wonder if they pulled values at different times during lab testing or under different conditions (breather hole covered vs. open).

If you need accurate values, might be worth your time to free air the things for 2-3 days to get the suspension in steady state, then pull parameters yourself.

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I know it is derived. You can use the published Qts and let the software define Qms or Qes, or use published Qms and Qes to define Qts. All get vastly different responses.

Am I the first person to put this information into a calculator? How did they come up with the recommended box sizes?

Guess I have to clean up my work station until I find my little DSO.

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