C621 InCeiling Series Whole House Series C621 ‹ › Technical Data: 6½" Polypropylene Woofer 1" Pivoting Silk Dome Tweeter Power Handling100 Watts Frequency Response45Hz – 20kHz Impedance8Ω Sensitivity92dB 1W/1m Diameter x Depth9¼" x 3 5/8" Ceiling Cut Out8¼" Replaces C620 Ceiling Speaker