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Digital audio sockets like that are called coax digital audio. It's TTL level digital audio feed, hook a (nice) RCA style cable between that and your Denon. Hook the video out straight to the TV. Turn the TV on the cable's input and turn the Denon on Coax Digital and enjoy.
There are some companies that sell "high end" coax cables with gold connectors etc. If you are only running it 6 feet or so, a normal RCA cable can plug between that audio port and the denon and it will work fine. It's digital. It's either working or it's not, for the most part. Better cables won't make it sound better.
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