System Type 2-way in-ceiling loudspeaker Woofer 8" long-throw aluminum cone Tweeter 3 x 1" fluid cooled soft dome (NHT Patented Three Tweeter Array) Crossover 1.6kHz, 18dB/octave high-pass, 12dB/octave low pass Frequency Response 40Hz - 20kHz, +/- 3dB Sensitivity 87dB (2.83V at 1M) Impedance 8 ohms nominal Recommended Amplifier Power 10W/ch minimum, 150W/ch maximum Inputs 2 each professional grade, gold plated spring posts Weight 7 lbs. Cutout Dimensions 10 1/4 " dia. Bezel Dimensions 11 1/4" dia Depth Behind Wall 4 3/4" Finish Matte white (paintable)