I am cabling a Marantz DV-6400 to a Denon AVR-4800 and wonder if I have to chose what kind of playback I want to hear via onscreen menu (ie SACD -2 channel, SACD -5.1 or DVD- AUDIO etc). Any one who owns a 6400 and has done this let me know, since I have it cabled and am only getting 2 channel audio not 5.1 sound. I have a simple RCA coax going out from the 6400 to a small TV to get the on screen display which DOES NOT show up. What am I doing wrong here? Is there a setup menu I should be going through?

THANKS