Definitive Technology BP-8040ST Bipolar Tower Speaker with Built-In Powered Subwoofer (Pair) You get a pair of the Definitive Technology BP-8040ST SuperTower floor-standing speaker. Bipolar technology for huge room-filling sound for every listener in the room. Built in 300 watt powered subwoofer delivers massive bass, eliminating the need for a separate subwoofer. Second generation patented BDSS high definition drivers for life-like tonal balance, supurb iteligibility and broad dispersion. Slim enclosure takes up less than 1 sq.ft. of floor space.