Advent ASW1200 12" Powered Subwoofer, with Auto Turn-On (Discontinued by Manufacturer) 100-watt RMS powered subwoofer with 33 to 150 Hz frequency response Adds dramatic, powerful audio to 5.1- and 6.1-channel soundtracks Down-firing, long-throw 12-inch woofer enables deep, rich bass Variable crossover lets user tailor sub's output to match other speakers Measures 15.4 x 18 x 16.5 inches (W x H x D); 5-year warranty