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In a perfect world, your center channel speaker would be mounted behind your screen, like in a movie theater. However, unless you have a front projection TV with an acoustically transparent screen, this is impossible.
Experiment with your center speaker placement to achieve optimal results. Depending on your listening environment, the center channel speaker usually will sound better above the screen. You might also want to try angling the center channel up or down for best sound. Never use two center channel speakers above and below the screen, as the sound output from each center channel speaker will interact with each other, boosting some frequencies, and canceling others. If your center channel is mounted below the TV, and the high frequencies seem harsh, try placing a small rug in front of the TV; this can absorb some of the sound, and smooth out the top end.