Acoustic Audio HD728 In-Wall/Ceiling Home Theater 7.2 Surround 8" Speaker System Acoustic Audio 9 piece home speaker 2-way set, 4 HD-800 wall speakers, 30Hz-22 kHz, 98dB, 2 HD-8 ceiling speakers, 38Hz-22 kHz, 98dB, 20-350W per speaker, 8ohm, 8" woven fiber bulletproof woofers Butyl rubber surrounds, pivoting titanium tweeters, rectangular cut out 8.75" x 12.66", overall 10.125" x 14.25", depth 4", round cut out 9.5", overall 11", depth 4", low profile housings HD-6c wall center channel 3-way speaker, 20-350 watts, 33Hz-22 kHz, two 6.5" woofers, 12mm soft dome tweeter, cut out is 19.25" x 7.5", overall is 20.5" x 8.75", depth: 3.25" 2 HDS10 wall passive sub speakers, 20-300W each, 26Hz-200Hz, 10" woofers, cut out is 10.625" x 10.625", overall is 12" x 12", depth is 3.75", these passive subs require a WS1005 sub amp each Use for in wall or in ceiling home entertainment, surround sound, home theater, multiple room systems, this listing and price is for complete 9 piece in wall and in ceiling speaker set