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Originally Posted by andrebrito  When measuring RT and transmission loss which is what I usually measure at I always get different results particularly at low frequencies. |
That's not nonlinearity, that's just due to not having identical test conditions. If you move the measuring microphone even an inch a lot can change, as I'm sure you know. Nonlinearity usually means distortion is added to the sound.
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the human perception of the acoustics varies greatly with the SPL.
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Of course, Fletcher-Munson at work. But 1) I did't think we were talking about human perception, and 2) that's not nonlinearity either.
--Ethan