"MZ" wrote in message
...

No, I'm implying that ALL amplifiers are "perfect".

Well, you're wrong. There is no such thing as a perfect amplifier.

Every amplifier I've benched exhibits this tendency - even
the el cheapo models.

Your test equipment isn't perfect either. Sorry.

Note that by "perfect" I mean that the level of distortion is well below
(at
least one order of magnitude) what's considered audible.

Well, that's quite a different thing. We know for a fact that all
amplifiers produce signals that distort the original. Claiming that these
distortions can be measured would be akin to claiming that you can count the
number of molecules in a glass of water, which is silly. Yet according to
you, these devices measure with complete precision. The bottom line is that
you're just guessing as to the accuracy of test equipment vs. the human ear,
simply because you haven't heard otherwise.