First off, I apologize if I posted a redundant thread, but through the search I didn't find a problem like mine. This question pertains to the Roku 2 XS.
I got this receiver for too good of a price to pass up, even though it's not the greatest receiver ever. I can stream netflix in 5.1 using dolby digital plus, but for titles marked 5.1 in amazon instant video, it only streams two channel stereo. I've looked through roku settings, and amazon instant video settings on their site. With netflix you can go into your account and adjust streaming quality.
I'm not really a novice at this. I just can't find out why Netflix works, but amazon does not.