I have the Paradigm CS-80R in ceiling speakers for my rears. I have them placed about 24 " beyond the outer sides of the main listening area. When a movie is deep in the throws of some really good surround sound, I can't tell that the speakers are in the ceiling as the whole room is filled with sound coming from all directions. I do think though, that if the speakers were in the wall directly over and behind the couch, I'd be able to tell the directionality of the sound, whereas I can't now with the speakers in the ceiling. I know that in ceiling speakers aren't ideal, but for my room with the couch placed up against the back wall, and no side walls to place surrounds (left wall is all windows and right is open to the kitchen), I didn't see many other options.