I can not get my system to play sacd disks in 5.1 only stereo. Receiver is a Denon AVR-2307CI and the Dvd/cd player is a Denon DVD-2910 .Both bought new by myself. DVD is connected to Receiver with HDMI for dvd playback and has analog cables out to EXT IN on receiver. I have disconnected HDMI cable no change . HELP!!