The C870 is Proficient's flagship LCR ceiling speaker and is designed for larger theater rooms and high-end systems. It features an 8-inch Kevlar woofer, 1-inch aluminum dome pivoting tweeter, and 175-watt power handling. Plus, you can tailor bass and treble up or down thanks to front-mounted contour switches. The C870 speakers will look good and sound great for years to come. Look to Overstock.com for huge savings on all your home audio and video needs. Specifications: Design: 2-way LCR in-ceiling Tweeter: pivoting 1-in. aluminum dome Contour switches: +3dB bass and +3dB treble Woofer: 8-in. Kevlar woofer fixed at a 15-deg. angle with butyl surround Sensitivity: 92dB Frequency response: 32Hz-21kHz Impedance: 8O Power handling: 5-175 watts Speaker dimensions: 11 in. diameter x 5 in. deep Cut-out diameter: 10 in. diameter