B&W CCM663SR

Two channels in one ceiling position

CCM663SR brings stereo to a zone served by a single cut-out.

The single Bowers & Wilkins CCM663SR speaker contains two channels. It fits a 202 mm opening in a 240 mm frame and needs 133 mm behind the ceiling; front protrusion is 4 mm. One unit can therefore cover an area where installing a spaced pair is impractical, without dropping either channel of a stereo programme.

Key features

• Cut-out 202 mm; frame 240 mm; depth 133 mm.
• Drive units: 150 mm twin-voice-coil Aramid Fibre bass/midrange and two 20 mm soft-dome tweeters.
• Impedance: 8 ohm, 4 ohm minimum per channel; power: 25–80 W per channel recommended.
• stereo/surround switch; dual-channel

What SR changes

A 150 mm Aramid Fibre bass/midrange driver uses twin voice coils, accompanied by two offset soft-dome tweeters. The two-position switch selects stereo or surround operation. This distinguishes the SR version from the ordinary single-channel CCM663 with its pivoting tweeter. Plan the wiring and amplification for both channels of the SR model.

Electrical and fitting data

Recommended amplifier power is 25 to 80 W per channel. Nominal impedance is 8 ohms per channel, falling to 4 ohms; sensitivity is 83 dB per channel or 89 dB with both driven. The -6 dB range runs from 48 Hz to 30 kHz. The C6 pre-mount kit and 6C back box are specified. Decide whether the zone will operate in stereo or surround before fitting and provide the connections needed by that configuration.

For a single-speaker zone, there is no need to choose between carrying left or right: the twin voice coils accommodate both. Surround mode provides another use for the same physical unit, rather than turning it into a pair. Sensitivity is specified separately for one channel and for both driven, so use the appropriate figure when estimating system level and leave the wiring accessible for commissioning.