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In a perfect world, your center channel speaker would be mounted behind the screen (as in a professional movie theater). In most home theaters,however, with direct view and rear projection TV's, the only option is mounting above or below the screen.
Mounting the center channel speaker above the screen usually provides the most intelligible center channel dialog (the main reason for a center channel speaker). If you have hardwood floors, it may help to place a small area rug between you and the front of the TV (this will prevent sound reflections from bouncing off the floor and destroying the clarity). As with any speaker placement, you should experiment. Remember that every home theater is different; what works in your friend's home theater may not work in yours.