Theater Solutions CS4C in Ceiling Speakers Surround Sound Home Theater 7 Speaker Set CS4C-7S Theater Solutions CS4C in ceiling speakers, recommended power is 10-150 watts per speaker, efficiency is 89dB, frequency response is 70Hz-20 kHz, 8ohm, 2-way design and functionality 4" extended throw woofers with polypropylene mica cones, 1" coaxial mylar dome tweeters, paint-able frames and grills, low profile housings designed for easy installation Unique wall locking mounting system, no mounting hardware needed, cut out templates and full instructions included, designed and engineered in the USA Cut out size is 5.75" per speaker, overall size is 6.875" per speaker, mounting depth is 2" per speaker Use for in wall or in ceiling home entertainment, surround sound, home theater, offices or commercial, this listing and price is for 3.5 pair / 7 in ceiling speakers