Bowers & Wilkins CCM663SR Ceiling Single Stereo Speaker With the combination of convenience and performance that is a feature of a entire custom installation range is no better demonstrated than by the CCM663SR ceiling speaker. It marries a woven Aarmid Fibre coned twin voice-coil 150mm bass/midrange driver with an offset array of two 25 mm soft dome tweeters. Thanks to its highly accurate and natural sound. With the twin voice coils and tweeters combine the stereo signal to enable the use of just one ceiling speaker in an installation zone without the loss of one audio channel. The CCM663SR includes a two position stereo/surround switch to instantly make the speaker very suitable to be used as a surround channel. Specifications Description 2-way dual channel in-ceiling system Drive Units 2x ø20mm (1in) soft dome tweeter 1x ø150mm (6in) blue Aramid Fibre cone bass/midrange Frequency Range (-6dB) 48Hz – 30kHz Recommended Amp Power 25 – 80w (per channel) Sensitivity SPL (2.83V, 1m) 83dB (per channel) 89dB (both channels driven) Impedance Nominal (min) 8Ω (4Ω) (per channel) Frame diameter 240mm (9.5in) Cut-out diameter 202mm (8in) Depth behind surface 133mm (5.2in) Protrusion 4mm (0.2in) Pre-mount Kit C6 Back Box 6C Bowers & Wilkins CCM663SR Ceiling Speakers Single, Ceiling Speakers, Bowers Wilkins CCM663SR Ceiling Speakers Single