Actually, the harmonics you refer to are produced by the driver itself. Cabinet resonance is determined by box size and how well the box is braced. What happens is that the panels in the box will absorb sound at sympathetic frequencies and then re-radiate them.

The large scale movement you saw of the glass and liquid in the Paradigm video is probably from the momentum generated by two drivers moving in and out in unison.

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!