Originally Posted by SoNic67
On the laws of physics. Linear attenuation (like lowering the volume with a blanket as suggested in the post that I replied to) does not add harmonic distortion.
Suggests a faulty model of how audio gear is built and set up.
The attenuators in audio gear always
precede the power amplifiers. When you turn the volume down, you turn down the power level that the amplifer operates at.
You aren't even properly interpreting the graph you posted from the HK 990!
It clearly shows that THD+N changes as you change the power output. Don't you know that the volume control changes the power coming out of the output stage?
BTW the odd increase in THD+N as power levels drop below 70 watts is not distortion rising, but noise increasing. The actual nonlinear distoriton probably continues to decrease or remains the same.
And no, serious AVR don't list power at clipping levels. Or distortion. Would be amazing to go past clipping and have only 0.05% THD.
That would be unfounded speculation trying to instruct my 40+years on the test bench. ;-)
Please observe the following enlargement of the graph you posted from the HK 990:
The HK990 starts clipping at 250 watts and 0.007% THD as indicated by the beginning of a sharp rise in THD+N
Now, we can play "Pick the power rating" ;-)
200 watts @ 0.065% THD+N
250 watts @ 0.007% THD+N
260 watts @ 0.025% THD+N
270 watts @ 0.1% THD+N
280 watts @ 1% THD+N