Bowers & Wilkins CCM664SR Ceiling Speaker Single With the CCM664SR it is a dual, two way ceiling speaker featuring a 1500mm woven glass fibre cone bass/midrange driver and two offset soft dome tweeters. The Twin Voice coil bass/midrange driver and tweeters allow a stereo signal to be combined to facilitate the use of just one ceiling speaker in a single installation area without the loss of one audio channel. It includes a two-position stereo/surround switch to instantly make the speaker very suitable to be used as a surround channel incorporating QuickDogs and plug and play functionality it is quick and easy to install. Specifications Description 2-way dual channel in-ceiling system Drive Units 2x ø20mm (1in) soft dome tweeter 1x ø150mm (6in) black glassfibre cone bass/midrange Frequency Range (-6dB) 48Hz – 30kHz Recommended Amp Power 25 – 80w (per channel) Sensitivity SPL (2.83V, 1m) 82dB (per channel) 88dB (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 CCM664SR Ceiling Speaker Single, Bowers Wilkins CCM664SR Ceiling Speaker Single