The volume of the 800 is enough that the pressure inside the box will change when both drivers are pushed out or pulled in.

Ported boxes can be smaller, and play louder because you can hear the back pressure wave from the cone.

Sealed boxes need to be larger so there enough volume of air to be easily compressed, but can be more punchy because the air acts as a spring.

So yeah, pushing one cone in will make the other move out as the box will try to maintain the same volume. But when they both are being driven there's enough energy from the amp to slightly compress or decompress the enclosure.

Of course all that is assuming both speakers are supposed to be in phase. I think they really should with how close they are to each other there would be a lot of cancellation if they were running out of phase. But I'm only an armchair speaker designer.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris