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Just bought a new arc and trying to get it fine tuned.  Playing Jack Ryan on Amazon prime.  I am able to get Dolby digital plus but not Dolby atmos.   I using Earc from LG Oled C 65” to Arc.  I think I have everything switched properly.   Sonos said Dolby Digital plus 5.1 is the same as Dolby atmos.

Amazon Prime is only DD+ 5.1 unless you pay the $2.99 extra per month.  


Jack Ryan is playing Atmos here on Prime. A couple things to check:

- What language are you playing? Not all of them are in Atmos. I have “English” on Atmos and “English Dialogue Boost:Low/Medium/High” on DD+ 5.1

- Do you pay the add-free tier of Prime Video?


When I upgraded to Amazon Prime no ads and Dolby Atmos showed up

 


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