William Sommerwerck wrote:

All you need is to apply the formula for the Doppler shift
of sound to the low-frequency excursions of the cone.

Write it out then.

Do it yourself, Bob. This is trivial, high-school algebra. It does not require
fancy math of any sort.

Actually, to do it in the time domain, it takes a Bessel function. The
reference to Terman is an excellent one.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."