Does anyone know anything about in-ceiling home theater speakers,
particularly those with (CV models) and without constant voltage
transformers?

What's the difference/advantages/disadvantages between the 2?
It's for a 5.1 set-up (if that matters).

Any feedback in appreciated. Thanks.

 

With CV speakers you can set them up to operate with a trigger (like a switch or something).

Say you have CV Speakers spread out throughout your house, but only wanted sections on at a time, you can just flip a switch to "off" and they wont be on.