You should be able to output the audio from the TV to the Denon. I imagine it will be a stereo RCA connection, and you'll want it to be a fixed output signal (as opposed to variable, which the TV's volume setting would control) if there are settings for that in the TV's menu. You'll also disable the TV's speakers. At least, this is all that's required in my TV. I would assume yours would be set up similarly.