"Bob Cain" wrote in message

Arny Krueger wrote:

Speaker Doppler as insignificant as it is, is positively huge
compared to the errors that a common nasty old 5532 or TL072 makes
in most audio circuits.

What's that say about the known and much larger non-linear
effects in speakers that we all know and love?

They are there, and distract our ears from the itty-bitty ones.

I think the guys that claim to hear these miniscule phase and dither
differences played back through the best of the available
speakers are blowing smoke...

The rubber hits the road in a blind, level-matched, time-synched,
bias-controlled listening test. They routinely lose out.

They argue about what they hear as a function of a couple of
degrees of phase shift at Nyquist and the kind of dither
applied to get to 24 bits!

Obviously they don't have a lot of good listening experiments under their
belt. Cut your chops on good listening tests and you start singing a
different song.

I notice that the one thing they are too totally polite to
ever do is question each other's "golden" ears despite the
differences among themselves in what they hear. Feet of
clay all around, perhaps.

As long as they stay away from ABX and the like, their belief structures are
preserved.

It was my annoyance and disbelief in all of this that
motivated me to look hard at Doppler distortion and find a
way to quantify it. The rest, as they say, is history. :-)

It's there!

Actually, I am quite happy to find that it exists, if not
for the usual reasons given, because of this original
motivation.

The point is that AM distortion, which dominates and is relatively large in
speakers, and often pretty audible, is only present in good electronics in
far smaller quantities. Masking rules, we hear distortion in speakers far
more so than in non-clipping, non-noisy electronics.