Acoustic Audio R191 in ceiling 2-way speakers, recommended power is 20-200 watts per speaker, frequency response is 45Hz-22 kHz, efficiency is 95dB, 8ohm, 2-way design and functionality 5.25" woofers with high rigidity polypropylene cones and extended throw assembly, butyl rubber surrounds for increased performance and durability, 12mm soft dome tweeters Paintable frames and grills, low profile housings designed for easy installation, integrated wall-lock mounting system, cut-out templates included for easy installation Cut out size is 6.625" per speaker, overall size is 7.625" per speaker, mounting depth is 3" per speaker, designed and engineered in the USA, full instructions included Use for in wall or in ceiling home entertainment, home theater, multiple room, industrial sound, outdoor entertainment, this listing and price is for 4 pair / 8 in ceiling speakers