I have been very happy with this subwoofer. Unfortuantely, my neighbors have had a few misgivings about the earth shattering impact produced by the low-frequency sound from this unit. Unlike several of THX certified subwoofers, the MX-150 THX is certified to THX performance standards when a single unit is used in rooms up to 3,000 cubic feet! This subwoofer has deep bass impact and its shielded driver is capable of producing sound below 20 Hz. If you don't have pre-amp level outputs (THX/surround controllers, preamps, crossovers), then this subwoofer is not for you as its does not include speaker level inputs. However, if you are in the market for a world class powered subwoofer, then you should definately check out this model. The cabinet dimensions are 23" high by 15 1/4" wide by 19 5/8" deep. It weighs 74 lbs!