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I replaced my AVR with a Flex HT, but don't recommend it.

When connecting external devices that can output multichannel PCM directly to a TV supporting eARC, the TV’s HDMI input ports should be set to bitstream and the Digital Output Audio should be set to Passthrough, not PCM.

Setting the output to PCM will down mix all incoming signals to PCM 2.0 for output. Input source devices will be communicated the info and limit their settings accordingly. LG TVs must also have eARC Support enabled or signal output will be bandwidth limited to the ARC spec and result in a down mix of multichannel PCM signals from an input source device.

Using Dolby Atmos for Home Theater setting with an optical cable limits signal output to Dolby Digital 5.1 and multichannel PCM will be off the table. If using HDMI for connection to a TV and eARC out to a device such as the Flex HT, select 7.1 uncompressed sound output in the input source device. Device settings and capabilities will vary of course.
 
Using Dolby Atmos for Home Theater setting with an optical cable limits signal output to Dolby Digital 5.1 and multichannel PCM will be off the table. If using HDMI for connection to a TV and eARC out to a device such as the Flex HT, select 7.1 uncompressed sound output in the input source device. Device settings and capabilities will vary of course.
Where would one find such a setting for PC? Trying to understand how/what format is Dolby access sending over hdmi to tv. For Apple TV it ends up decoding on device before sending it over as pcm, but what about for a pc? Looking at the sound properties, it shows supported formats, but I am not seeing for a way to disable the encoded ones. I dont have a flex ht to try (but made sure TV out is eArc/pass-through and input in the TV is also bitstream). curious if PC will also work similarly to apple tv.

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If the device does not support uncompressed multichannel PCM for output, two channel PCM would be the setting to use for output rather than any Dolby bitstreams using Dolby Access as they are not supported by the Flex HT.
 
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