Ok I have been trying to figure this out for some time now. I have a pioneer elite 52 hooked up in the bi amp style for speakers which in turn is 5.1 also. I have my Sony blu ray player hooked up directly to the receiver through an hdmi and sound is only coming out of the left and right speaker. I can not figure out what settings to mess with in order to get it to use all 5. My xbox and directv play out of all 5 just not my blu ray. Any ideas on how to fix this problem.