This compact NS-SW050BL 8 In. 100-watt Powered Subwoofer from Yamaha incorporates a number of Yamaha's own advanced, high-performance bass technologies, such as Twisted Flare Port, Advanced YST II (Yamaha Active Servo Technology II) with discrete amp circuitry and a high-quality 8 in. woofer unit. The resulting bass response is powerfully rich and impactful. The gentle curves and matte black finish is stylishly elegant. Designed to be unobtrusive, it’s sure to look beautiful in a living room or home theater room and will match a wide range of speakers. More than a black box, it’s the heartbeat of your home theater system and provides excellent bass for movies and music.