Arny Krueger wrote:

I've got two years of physics, an undergraduate degree in engineering and
completed most of my MSE except for my thesis project (wife's pregnancy
ended that). I've also measured it quite conclusively in the lab. I've been
reading papers about it for like 30 years in the JAES and JASA. Yes, I think
that Doppler distortion exist in speakers, but no I don't think it is a
serious issue. In contrast the AM distortion in speakers is a very serious,
audible issue.

This is a reasonable assessment of the situation. The thing about doppler
modulation, though, is that it's really interesting and the math is a lot
of fun. Not like typical AM distortion from amplitude nonlinearities, which
is dull, even if it's a more significant problem. So I think folks should
continue investigating doppler distortion because it's an interesting problem
even if not a terribly important one.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."