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This TCL Roku TV does indeed support Dolby Atmos Passthrough and Processing. Hope This helps! Thank you, TCL Customer Support
Sorry, there was a problem. Please try again later.While the tv does support Dolby Atmos the included Roku software seems to mess with it. I just got my 75R635 today and tried to connect it to my Vizio SB36512-F6 through HDMI arc. I does not work. I tried everything and it just wouldn't send any sound other than an extremely intermittent feed that was more cutting out than sound. I cound get it to work through optical cable but that's not Atmos. I could get Atmos from my xbox one but the tv randomly restarts when in the xbox home screen. I finally hooked up my Roku Stick from the old tv and everything worked fine while I was running from the stick rather than the built it Roku. I hope this helps
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