Have you switched your center with one of your other speakers to verify that it is indeed a 1050 problem? Otherwise I'm not aware of a setting that would make just 1 speaker sound bad but lets take it 1 step at a time, lets try the swap and see if the problem stays with that speaker or stays on the center channel.
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m-mmeyerGO TWINS My DVD's
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m-mmeyerGO TWINS My DVD's "Pain heals, Chicks dig scars and glory is forever"
From the mouth of Keanu Reeves one the great pundits of our time!