I would like to see the construction of that sub box. It looks like it's made of MDF like most other boxes but I wouldn't think that MDF would withstand that kind of internal pressure when the sub hits.
For those that are old enough, it reminds me of the speaker in Back to the Future, where Marty McFly sends himself flying across the room after playing his guitar while standing in front of the speaker. In reality, it makes you wonder what kind of amps you'd have to run to power that monster. Today's audio/video REALLY goes overboard sometimes--just because you CAN do something doesn't mean you SHOULD.