Boston Acoustics Horizon Series HPS-10HO 10-Inch 250-Watt Powered Subwoofer (Black) (Discontinued by Manufacturer) 10" 250-Watt RMS powered subwoofer High-output, front-firing rear-ported Deep Channel Design (DCD) drivers BassTrac circuitry for tight, distortion-free bass at all output levels 35Hz-150Hz frequency response (3dB) 40Hz-180Hz 24dB/octave low-pass subwoofer crossover