Yes, 2000 cubic feet, not square feet. Bryan's probably right, I'd need at least 4 more 15" subwoofers in that kind of space. Hopefully 2 will be able to keep up - looks like it will, according to
this guy's experience. He's got just short of 2000 cubic feet and is hitting above reference levels (120+ db) at about the same seating distance (11 feet - 3.5 meters). I've got my fingers crossed. This will be quite a change from a lot of systems I've heard, where the speakers are struggling to keep up with the subwoofers (not even at reference levels, either).