Cursitor Doom wrote:

Just one final point. Is a single sine wave sufficient, or will it have
to be two, harmonically-unrelated sine waves?


** A single sine wave is needed for audio power testing.

Amplifier power ratings are based on the *rms* value of a sine wave - hence the misleading term "rms power".


ISTR with RF power
measurements you need to perform the slightly more complicated 'two-tone'
test; just wondering if the same applies at audio frequencies?

** Using two tones tests for intermodualtion, always present where there is non-linearity.


.... Phil