Blue Octave Home DS10 Subwoofer (Black) Blue Octave DS10 ported home theater powered subwoofer, 400 watts peak power, efficiency is 97dB, frequency response is 28Hz-260Hz, built in high efficiency amplifier 10" Down firing long throw subwoofer, high rigidity PVA treated woofer cone with butyl rubber surround, 8ohm impedance, line level RCA inputs, high level input and output terminals Variable 50Hz to 150Hz frequency control knob, volume control knob, signal sensing auto shut off switch, bottom linear bass port, rubber padded feet, black ash finish High density MDF enclosure with advanced RFL bass reflex design, product dimensions (H x W x D) 13.25"  11.25"  13", designed and engineered In the USA Use for in wall or in ceiling home entertainment, home theater systems, surround sound systems and multiple room systems