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I just hooked up my new arc ultra to my equally new lg b4 83 inch tv. Although my new lg is described as having an e-arc hdmi connection, it only says ARC on one of the HDMI’s I plugged into. I haven’t been able to verify in my app or on the tv or my Sonos app on my phone that I’m receiving Dolby atmos signal when I play an atmos  source such as the movie A Star is Born(Lady Gaga). 
‘The sound is good but the spatial separation is weak  I did set it up through true Play

 

You can verify the format of the TV source on the Now Playing screen of the Sonos app.  

 

The LG sales sheet shows eARC on HDMI 2 

https://www.lg.com/us/tvs/lg-oled83b4aua-oled-4k-tv

Also what source are you using to view the movie? Such as:

  • 4K Disc
  • AppleTV
  • Other

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