If you ever spot Spam (either in the forums, or received via forum direct message) please use the Report button at the bottom of each post to make sure a Moderator can handle it quickly. Thanks for your help in keeping things running smoothly!
Do you have a 4K source to send to the screen? If you do I doubt the Denon would pass a 4k signal. If you're connecting 4k to the screen direct that solves that issue. If you don't have any 4k sources and are just passing 1080p sources through the amp to the screen you'll be fine.