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Howto - Distortion Measurements with REW
Howto - Distortion Measurements with REW
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Old 25th March 2020, 09:53 PM   #321
Mark Tillotson is offline Mark Tillotson
diyAudio Member
Join Date: May 2018
Location: Cambridge UK
Originally Posted by tcpip View Post
The general impression I've been getting from discussions here is to take 0.015 - 0.007 = 0.008% as the distortion?

I believe some members are doing this per HD, not at the THD level, and then adding them up to get the derived THD.

I'm new to this; I too am learning.

Doesn't work like that - distortions may be cancelling each other out or reinforcing each other or anything in-between, so that the actual distortion might be as bad as 0.015+0.007 = 0.021% (the amp's 0.021% distortion cancelled the loopback distortion and then some).

Its best to quote the amp figure and the loopback figure so that the uncertainty in the measurement is explicit.
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