Question Struggling Getting ATMOS from Fire TV stick 4k to ONKYO TX-NR474

creceine

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Resolved for unknown reseacono_O

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Phew, the forum is back finally.
I was struggling with my setup of my kit to get ATMOS out of it in pthe past couple of days.
The idea is to play Jack Ryan 4k version in Prime Video from Fire TV stick 4k to my receiver ONKYO TX-NR474 then to Samsung TV with ARC (not eARC). The receiver is connected to Bose Accoumass 6 in 3.1.2
In the Prime video,the track can be and is selected as ATMOS. But on the receiver, I can only see Dolby Digital input.
The receiver is claimed to support ATMOS 3.1.2 and the firmware is updated to the latest.
The most confusing part is that the input format of receiver is not actually controlled by the Fire stick output but the TV sound out put format. When I set the sound output on TV as Bitstream-DD the receiver is displaying with DD. When I change the sound output on TV to Bitstream-DD+ the receiver is displaying with input DD+.
But ATMOS is never acheived.
Someone can shed some light on it?
The diagram is attached.
 

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