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I just purchased the Beam Gen 2.  I have a Roku Ultra 2022 and a Sony with an ARC HDMI port.  The new IOS app S2 always shows in “Dolby Atmos” on all content.  This can’t be true.  Does the Roku Ultra upscale every signal to Atmos?  

You might have more luck on the Roku community. A quick google returned this, for example:

https://community.roku.com/t5/Solving-playback-issues/Roku-Ultra-Plex-Everything-is-in-Dolby-Atmos/td-p/797690


What exactly are you watching on the Roku? What are the Roku audio settings currently set to? 
 

Set the TV to these settings (if available):

eARC: Auto

Digital Audio Out: Auto 1

Dolby Digital Plus Output: Dolby Digital Plus

Pass Through Mode: Auto


From the thread referenced:

The new roku if not put in bypass will generate a dolby atmos signal on everything. 


Where is the bypass setting for Roku Ultra? 


Where is the bypass setting for Roku Ultra? 

You might have more luck on the Roku community.