For 4K programming, is it better to send the U5 a 1080P signal or a 4K one? I ask because my Apple TV 4K keeps reverting to 1080P with Dolby Vision, but my Amazon Fire Stick 4K and UHD blu ray player are fine sending 4K signals to my U5.
Hello, please check this video for the Apple TV: Screeneo U5 | Apple TV with Dolby Atmos and Dolby Vision - YouTube
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