I watched hulk the other day on the ep500. The driver was moving so fast and so far ... in an almost violent manner. Perhaps I could use that somehow to power the sub. But really I could see the driver moving even with the black material cover on(meaning it was hitting the cover). Is that normal?

PeachTree 65se, PeachTree D5 and SVS SB1000 - Stereo
M80s, M22s, SVS PB3000