Holy grail - How to stream UHD+Dolby Vision+Atmos lossless to Sony TV+Marantz AVR?

Plex Media Server NAS & Devices
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I’m basically trying to find the magic recipe to make this all work. I have the following Plex clients to choose from:
Android TV client build into Sony A90J
or AppleTV 4k (2021 model) or Win10 home theatre PC
Audio would through Marantz 6014 receiver (w/eARC)

Running Plex server on a separate Win Server 2019 system with xeon CPUs. I can throw an old Nvidia 1080 card or quadro in there if needed.

What format do the source files need to be in? I do have DvDFab, MakeMKV, etc
There are countless, often contradictory threads on this, many filled with outdated info. Does anyone have the magic recipe?

Thanks!

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Nvidia Shield 2019 Pro ← HDMI → Marantz AVR ← HDMI → Sony TV

Note: There are several different Dolby Vision profiles. No one device supports them all, including the Shield. Plex is at the mercy of the device. It if does not support a certain profile, there is not much Plex can do about it.

Read [INFO] Plex, 4k, transcoding, and you - aka the rules of 4k

TV based apps cannot pass lossless audio such as TrueHD, even over HDMI-eARC (no known TV from any manufacturer supports this capability).

Does not support TrueHD + Atmos passthrough (Apple does not permit TrueHD passthrough). Audio will be passed as PCM 7.1 and Atmos information lost.

Plex HTPC does not support HDR (reference).

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Would the Nvidia Shield work for this? or Xbox? Or is there ANY device that will?

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The 2019 Shield TV Pro can, but UHD DV Profile 7 playback isn’t officially supported and may fall back to HDR10. It’s the closest you’ll get.

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