This will make some people laugh at such a stupid question but here goes. My U-verse DVR and Samsung HDTV are connected to my Pioneer VSX 820 receiver. When watching TV I'm only getting sound out of one speaker. Both speakers play fine with DVD's and CD's so it's not a speaker wiring problem. I tried switching cable connections from left to right, and I get sound from one speaker each time. But never both. Any suggestions would be appreciated.