BIC America M-SR6D 150-Watt 2-Way In-Ceiling Speaker with Dual Tweeters, White Recommended amp power: 85W 6.5" polycarbonate woofer Required cutout diameter: 7.5", depth: 3.06" Sensitivity: 90dB at 1W/1m .5" poly dome tweeters 2-way in-ceiling speaker with dual voice coils for rich overall sound 6.5-inch poly/carbon cone woofer and dual 0.75-inch titanium dome tweeters Tweeters are mounted on small swivels for custom directional placement 55 Hz to 21 kHz frequency response; recommended amp power of 10 to 150 watts 9-inch total diameter and 7.5-inch cutout diameter; 1-year warranty