The Bowers & Wilkins CCM663SR is a single in-ceiling speaker for your integrated home audio requirements. The SR suffixed speakers in the CI600 range are dual channel speakers allowing you to send stereo signals into one speaker without losing a channel. Still containing the Aramid Fibre mid-bass cone this speaker will provide the same level of clarity that any other CI600 speaker will produce. The two soft dome tweeters are spaced apart in an offset array. Providing the spacing required for two channels. A switch on the unit can also switch from stereo to surround making this an ideal speaker for a surround channel in your system.