I'm not being snide when I ask, why don't you work it out for yourself?
It's not horribly complex.

You just don't get it. Any attempt to do that from first
principles simply flounders. It can't be done.

Sure it can.


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.

The way you learn things -- that is, understand them -- is by doing them.