I just hooked up my all Polk 5.1 (with Denon A/V receiver) home theater system and it sounds awesome. Blu-rays work well, music CD's work well, but I have one question. I have AT&T U-Verse as my cable provider and most of my channels are digital. However, NO sound ever comes out of the center speaker when watching TV. When watching TV sound only comes from right and left front. Is there anyway to get sound through the center channel speaker? I have looked through all my manuals and I can't find a solution anywhere.