See nothing, hear everything

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.