In my view, all center speakers are compromized by their position above or below the TV. However, most of the material played by the center is dialogue with some special effects. The best position is to get it as close as possible to the height of the mains with the tweeters at the same level. Being on its side is less important than any other factor. Good luck!
Speaker on its side as a center?
I am curerntly using a B&W 804 as a center with 2x 804's as mains. 2x 805's as rear. The center 804 was one of a pair, but I lost one courtesy of the shipper. I would like to lay the center 804 on its side under the plasma TV. Idea is to have this on some kind of a shelf structure under the TV platform. Any thoughts on performance of a speaker on its side? thanks.