The CCM664SR is a dual two-way in-ceiling speaker with a 150mm fiberglass cone bass/midrange driver and dual offset soft dome tweeters. A stereo signal can be combined with the dual voice coil bass/midrange driver and tweeters to allow the use of just one in-ceiling speaker in a single installation area without the loss of an audio channel. The CCM664SR also features a two-position Stereo/Surround switch, allowing the speaker to be used as a surround channel out of the box. With the integration of QuickDogs and plug-and-play features, installation is quick and easy.