I have the denon 4300h and never had trouble with it. I am using a epson 5040ub and don’t x800. I also have an Apple TV 4K. All of these work great. Make sure you are connecting the zone 1 primary video output to the projector. Zone 2 does not support 4K.
X800 make sure you are connecting hdmi 1 to the denon.
Make sure you connect to a 4K capable hdmi only in the projector.
Sent from my iPhone using Tapatalk Pro