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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.

And:

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

OK... here goes:

Harmonics.

Harmonics of what?

Your example below shows nothing concerning ultrasonics, I'm afraid.

If you have a ultrasonic tone at 25 KHz, say, its harmonics are at least
at 50KHz...

If 25 KHz is inaudible, then certainly 50 KHz will not be audible.

If the only way that ultrasonics can affect the sound is via
intermodulation (NOT harmonic) distortion, then it cannot be a good
thing. And even in that case, the ultrasonics do not affect the sound
you preceive. It's the non-ultrasonic distortion's sound that you feel
are coloring the sound. That is bad.