Bob Cain writes:
[...]
Why
WOULDN'T a speaker act as a moving platform?

I've given numerous physical reasons the behavior you expect can't and
won't happen [...]

1) It is not the behavior I "expect" - it is the behavior predicted by
a well-known physical law.

2) State your reason here and now - give it your best shot. Or else drop it.
--
% Randy Yates % "Midnight, on the water...
%% Fuquay-Varina, NC % I saw... the ocean's daughter."
%%% 919-577-9882 % 'Can't Get It Out Of My Head'
%%%% % *El Dorado*, Electric Light Orchestra
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