It was formerly in 1 a 1.8 cu. ft. sealed box which in comparison to the vented was just a vibrator. A really, really big vibrator. Oooooh!
'Close Encounters' updated in DTS literally blew the driver out of that cabinet when the 'mother' ship comes over the mountain.

Just played it (I'm stoked) and you could feel the low cycle energy more than hear it and it just fills the room, not coming from anywhere but everywhere.

Could be watching movies and ordering pizza for a few days.