Anyone who is interested in impulsively buying a large and enormously heavy subwoofer has a great opportunity with the
Monolith M-215. This has to be the bang-for-the-buck king at the moment since it fully doubles the performance of the 15" THX Ultra for only $400 more at the moment. Insanely good deal, nothing else in the sub market will touch its performance for that price. Hell, it's a great deal at MSRP even. But buyer beware its 216 lbs weight.