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Recently installed an Arc and Sub in my home. 
I have had Amazon Unlimited for a few years, but I would like to take advantage of hi-res music with the current setup.  
I have tried to play music through the Sonos app, the Amazon music app and by asking my Alexa.   I have never had the HD or Atmos label come up once I start playing the music on my Arc.  
For example , I play Steely Dan’s “Time out of Mind” which shows as HD when I play it on my phone.  However, when I cast it to my living room Arc, the HD label goes away.  
I have added the Amazon music service to my Sonos, but again, playing this song does not show the HD label.  
Not really sure if this label should come up in the Sonos app, or how to check music quality that is playing

I don’t see any audible advantage to the high-res music, Atmos yes.

Still on my controllers I see the music’s format shown in the app, don’t use other methods of playing.