"Jim Carr"
"Phil Allison"

** A time delay or advance is just that - it is not Doppler. Any
such
delay or advance depends solely on the position of the cone - not its
*velocity*.

I disagree. The time delay or advance *is* Doppler.


** Doppler frequency shift is proportional to source velocity - so they
are not the same.


The speed of sound is constant in a given medium.


** If the medium is moving at some speed then that adds to, or subtracts
from, the speed of sound in still air (ie 343 m/S)


In the classic example of the train whistle the
velocity of the train changes the distance/time between waves,


** Yes, because the train is moving through the air.


but those waves travel just as fast as if the train were still.

It seems like you are
saying Doppler has to do with adding velocities together, which is untrue.



** Not at all - but the magnitude of the Doppler shift is proportional to
the velocity of the source compared to the surrounding air. A woofer cone
takes a small volume of with it for the ride.




............. Phil