Hi, I purchased an AVM 50 on here about a year ago and finally got the rest of the system pieced together and got it all hooked up this weekend. I have a dish network cable box hooked to the AVM 50 via HDMI. The AVM 50 auto defaults to 5.1 Dolby, but I'm only running 2 ch stereo. Is there a way to get it to switch to 2 ch stereo instead 5.1? I've been messing with it but can't figure it out. I called Anthem tech support, but when I told them it was used equipment, they pretty much gave me the bird.