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Question: Denon avr 591

I have a new Denon avr-591 receiver and a new Samsung Blue Ray DVD player. They are linked via a HDMI cable. When I play a Blue Ray DVD, the receiver says its in "MULTI CH" no matter what Blue Ray DVD I play. I bought the new Denon receiver to get the full HD features from Blue Ray. Is there a setting I'm missing in setup..??? Any suggestions.?