Theater Solutions SUB8S 250 Watt Surround Sound HD Home Theater Slim Powered Active Subwoofer (Black) Theater Solutions SUB8S slim 4.75" height design fits under most furniture, 250 watts peak power, frequency response is 35Hz-150Hz, 24dB per octave crossover, 8ohm impedance Built in digital drive high efficiency amplifier, 8" high efficiency low frequency down firing transducer, L/R RCA inputs, high level L/R input and output spring terminals Variable 35Hz to 150Hz control knob, gain control knob, 0 or 180 degree phase switch, built-in auto shut off, bottom slotted bass port, black ash finish Variable 35Hz to 150Hz control knob, gain control knob, 0 or 180 degree phase switch, built-in auto shut off, bottom slotted bass port, black ash finish Full instructions, 9 10 dual RCA cable, and "Y" adapter included, use for in wall or in ceiling home entertainment, home theater systems, surround sound systems and multiple room systems