The Atlantic Technology 3.1 HSB is a TV Speaker Base that houses passive left, center and right speakers, as well as an 80 watt powered "H-PAS-enabled" down-firing subwoofer, all in one compact sturdy cabinet 4-3/4 inches high, 36 inches wide, and 16 inches deep. Developed to fit under any flat panel TV up to 60" wide, placed on a credenza or entertainment stand, the 3.1 HSB is designed to be combined with a quality AV receiver. (There is no sound bar or sound base at any price that offers the power and flexibility of an entry level AV Receiver.) Pairing the 3.1 HSB H-PAS Speaker Base with an AV receiver gives the consumer a compelling home theater experience--with options to add optional "real" surround speakers--combined with a real H-PAS subwoofer that delivers room shaking bass down to 35 Hz.