These Bose® 161B 161™ Speaker System offer high performance in a slim and elegant design for stereo surround sound use. Stereo Everywhere speaker performance delivers stereo almost anywhere in the room. Articulated Array speaker design features two 21/2" Twiddler drivers that are angled to reproduce lifelike stereo over a larger listening area instead of one small sweet spot. The high-excursion Twiddler drivers generate more air movement from a small enclosure. Custom brackets enable easy mounting for stereo or surround sound use. Compatible with amplifiers and receivers rated 10 to 100 watts per channel.