Theater Solutions TS1000 In Wall Surround Sound HD Home Theater Passive Subwoofer Theater Solutions TS1000 passive in wall sub speaker, recommended power is 20-150 watts, frequency response is 22Hz-200Hz, efficiency is 92dB, 8ohm, spring loaded speaker wire terminals Streamline 3.625" mounting depth, 10" poly treated woofer with butyl rubber surround, 2nd order 12dB per octave crossover, paintable frame and grill, low profile housing Integrated wall-lock mounting system, cut out template included, cut out is 10.625" x 10.625", overall is 12" x 12", instructions included, designed and engineered in the USA Use for in wall or in ceiling home entertainment, surround sound, home theater, offices or commercial This listing and price is for 1 in wall passive sub speaker, this passive sub requires a SA200 sub amplifier or sub amp with similar specifications