So it just happens my receiver and my TV are both Samsungs, and there's this thing called Anynet+ so they can work together. I have a Samsung HT-Z320 receiver. It's also a DVD player. When I use it as a DVD player, I get all 5.1 surround sound. When I watch TV or play with my xbox 360, I only get 2.1 because instead of using HDMI, it uses the optical cable for some reason. I can't find the option of using the HDMI for audio on the TV and xbox 360.