---- Original Message -----
> David, ALL speakers (except sealed acoustic suspension ones) have a vent of one
> sort or another that lets the air out (and in) from the back of the speaker.
> There are also infinite baffle types that have the rear not enclosed at all...
> Surprised you (or anyone) can be a professional audio engineer and not know
> that. It is not an "acoustic ambiguity" but a failure of logic and
I understand venting, but to have two identical *cones* in close
proximity moving in opposite directions simultaneously impresses me
as being a different thing. If it's any consolation, I don't
design speaker enclosures.