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Then, what if the measures you take in attempting to reduce distortion just "sound bad"

I agree with the darTZeel approach: "Timing errors" in amplifier circuits, which as far as I know are not the subject of a standard measurement method, are bad as far as musicality goes.

While at the same time, the methods commonly employed (such as global negative feedback) to reduce distortion measurements can end up sounding bad.

And it must be said that there is (as I understand things) some overlap between the approaches of darTZeel and Ayre.

I am not prepared to say that if a distortion can't be heard it makes no difference, but, it would seem to me that if the distortion specification of an amplifier circuit is one or two orders of magnitude lower than audibility, it really should not matter. This of course is in the context of listening to loudspeakers in a room, where the native distortions of the loudspeaker and the variations caused by room acoustics in one sense--the statistical sense--swamp amplifier distortions, but, I would never claim that they could never be heard.

I was driving once, minding my own business, on a nice early-spring day, and I suddenly thought, eww, who has a cigar? I looked over, and the driver of the Porsche 911 that was slowly passing me on the left, going just a couple of mph faster than I was driving, was smoking a cigar, but his windows were closed, as were mine... .

How many parts per million, yet I could detect them???

I will leave the last word to Goethe:

"The human being himself, to the extent that he makes sound use of his senses, is the most exact physical apparatus that can exist." (Goethe, Scientific Studies)

JM

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