If you get an acoustically transparent screen, mount the center channel directly behind the screen. Also, mount the rears to the walls...speakers are directional components. Mounted on the ceiling, theyll fire straight down. Depending on the seating positions, this can cut off a significant portion of the highs. Most speakers will lose the top 5KHz to 7KHz just from being 30* off axis. Think of it when you adjust an EQ or tone control to eliminate the upper frequencies. Generally, for a surround setup, and even stereo, you want the speakers pointing towards the listening positions. When the speakers arent positioned right, you get phase shifts which result in a very un-natural sound. Hope that helped a bit .
EDIT: Heres one for you. Im not sure which size you need, but this is the type of screen Im talking about. http://www.amazon.com/Accuscreen-800...5713238&sr=8-2
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