I have a older Sony STR-SE501 receiver. It is an older unit to say the least. I have my dish network DVR system and a Sony DVD/VHS hooked up to it via optical cables for audio. When I order movies from dish network that transmit the 5.1 audio, the receiver indicates that it is receiving in the 5.1 mode. It also allows me to choose the cinema audio and shows all 5 speakers on the display. When I watch movies on the DVD player, the receiver doesn't show that it is decoding the 5.1 audio and only the front/center speakers...