C646 InCeiling Series Whole House Series C646 ‹ › Technical Data: 6½" Kevlar® Woofer 1" Pivoting Aluminum Dome Tweeter ±3db Midrange & Treble Contour Switches Power Handling150 Watts Frequency Response32Hz – 22kHz Impedance8Ω Sensitivity92dB 1W/1m Diameter x Depth9¼" x 3-5/8" Ceiling Cut Out8¼" Replaces C645 Ceiling Speaker