I noticed that in many Class D amps, THD+N ratio gets better as volume is turned up but what I listen in real world is that hiss noise gets louder when I turn up the volume.
Another thing I noticed is as you can see above, THD+N ratio drops by 10dB as power goes up by about 10 dB which indicates the absolute value of THD+N is not changing.
Thus, any noise including hiss shouldn't get louder regardless of volume but it is not.
Can anyone tell me what's going on?
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