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RE: update 2

Posted by Tre' on February 22, 2019 at 10:12:50:
I would say you want to adjust the level to where the amp is just below visible clipping.
Turn up the volume until you see the sine wave start to flatten (clip) at it's peaks then turn down the volume just a little until the sine wave is not flattening at its peaks and read the voltage.
If clipping is visible on a scope, the distortion is quite high. That's not usable power.
"..."full power" for the purposes of measuring distortion in amplifiers is usually taken as a few percent below clipping..."
Tre'