I have tried several boxes on my AppleTV 4K with Dolby Vision, this is the only one that works BUT there are problems with ARC. Even if it is not connected to the TV's ARC port. My Sony A1E gets confused when using TV speakers or external audio. This conflict is returned to the box, causing malfunctions. I still use it every day, but I have to change the audio output on the TV 75% of the time for it to work. Yes, I've changed the HDMI ports, toggled the ARC switch on the box off and on, still nothing changes.
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