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In article ,
wrote:

wrote:
If ultrasonics are contributing to 'overall color' it's because they're
causing audible-range distortion in the output of one
of the devices in the signal chain. That is rather unlikely
to be a good thing.

How did you come up with that experience? If it's inaudible, how can it
affect the sound?
Harmonics.

Oversimplification

Have you ever experienced a signal that goes slowly from audible to
inaudible up the spectrum? Then back? On the way back down, you will
likely start to grit your teeth just before you actually perceive the
sound consciously.

I've done the experiment many times. ON highly linear systems
with sufficient badnwidth, the effect you're claiming doesn't
happen. On narrow band system with fairly non-linear
behavior it could, but, when you analyze why, you find it has
nothing to do with ultrasonic signals: it turns out the nonlinearity
of the system folds that energy back down into the audible band.

The difference between Middle A played on a piano, a
clarinet, or a violin, or a sine-wave generator is a matter of
harmonics... color.

Wrong. Attach, decay, envelope characteristics are at least as
important. This can be shown by taking the steady state portion
of the clarient, violin, even a repeated portion of the piano, remove
the trasnients, and it's VERY difficult to tell which is which.

Do you know if such a test recording exists?