6.5in. High Performance Left-Center-Right Speaker. Can be used as the center or left/right channels. Woofer: Dual 6.5in. Mica filled polypropylene with Butyl rubber surround 20 oz. magnet and 1.25in. voice coil Tweeter: 1in. silk soft dome Sensitivity: 90dB (1W/1M) Power Handling: 20 to 150 Watts Impedance: 8 ohms Frequency range: 40Hz - 20kHz 3dB.