MrSandman's got a good point there -- the TV may be your problem. Have you played any two-channel material to know if the clipping occurs under those circumstances? If the clipping doesn't occur during two-channel only playback, the TV-as-center is probably it (and it's certainly an easy thing to test). If that is the problem, you might try disabling the center and using "phantom" center for a while.
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gonk
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