Bowers & Wilkins: CCM664SR Single Stereo In-Ceiling Speaker...

... a high performing twin voice coil bass/midrange driver with dual tweeters allows a stereo signal to be combined to facilitate the use of just one ceiling
speaker. Also included is a two-position stereo/surround switch to instantly make the speaker very suitable to be used as a surround channel.

B&W CCM664SR Info Sheet

B&W CCM664SR Specifics:

• 2x 25mm (1in) Soft Dome Tweeter
• 1x 150mm (6.0in) black glassfibre cone bass/midrange.
• 2-way in-ceiling system
• Frequency range: 48Hz to 30kHz
• Recommended amplifier power: 25w - 80w (per channel)
• Sensitivity: 82dB (88dB both channels driven)
• Nominal impedance:8ohms
• Frame Diameter: 240mm
• Cutout Diameter: 202mm
• Depth Behind Surface: 133mm
• Protrusion: 4mm
• Optional Pre-mount Kit: C6
• Optional Back Box: 6C