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It could have been just to pass Dolby Vision. Like you, it's been a few years since I set up the receiver. I just remember needing to change a default setting to get everything to pass through properly. I am not in Michigan right now, so I cannot check my notes.

Are you using certified high speed cables capable of supporting 4K video, both from the AVR to the display and to the Apple TV 4K? Amazon sells affordable cables from Monoprice -- just search for "Monoprice certified high speed HDMI cable". Another thing to check is whether the Marantz AVR has...