Some high spl vehicles will do that as well.
Back to the subject at hand.
Last night I watched "The Hitchhiker's Guide to the Galaxy". Holy **** This movie has TONS of LOW end. I am talking deep. My Ultra actually unloaded, some of the bass was so deep (unloading referes to when the air in the enclosure and ports loses pressure) it went below my 16hz tuning. My walls were shaking, honest to god. I have NEVER felt that before. Chapters 3 and 4 on the disc have ungodly loud and deep bass passages. I suggest everyone get this disc as a demo. The movie, well... it sucked. The only thing that kept me watching was the great bass.
