The CCM664SR is a dual, two-way ceiling speaker featuring a 150mm(6in) 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. The CCM664SR also 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