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Noel
Avid Contributor II
May 24, 2021
Answered

No Atmos sound via Sonos Arc

Hi, just connected new LG OLED TV to new Sonos Arc . All connections and set up verified by Tv and Sonos app. I can’t get anything to play with Dolby Atmos through the Arc even if I try Apple TV4K with movies featuring Atmos. Any assistance would be appropriated. TY 

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NoelAnswer
Avid Contributor II
May 25, 2021

Managed to solve the issue. 
Discovered a “support eARC’ setting in LG TV advanced audio menu that needed switching on. This was in addition to the main audio output selection, and all the other selections that had already been selected. 
Thanks to all for helping out. 
 

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GuitarSuperstar
Lead Maestro
May 25, 2021

@Noel Do you have the latest firmware installed on your TV? What HDMI cables are you using to connect the Arc and Apple TV?

"Receive with simplicity everything that happens to you." - Rashi
lewisc
lewisc
Headliner I
May 25, 2021

These are the settings we use for LG:

Sound Out: HDMI ARC
Digital Sound Out: Passthrough (Settings > Sound > Additional Settings > Digital Sound Out)

eARC: On

Simplink: On

 

Latest Software should be: 03.21.21

 

Verify your source is outputting Atmos, check the HDMI cable (replace cable) and that it’s in HDMI port 2

Authorised Sonos Installer
muri
Lyricist III
May 25, 2021

Had similar issues until I switched off some “change format” in audio/video settings on the Apple TV 4K.

 

NoelAuthorAnswer
Avid Contributor II
May 25, 2021

Managed to solve the issue. 
Discovered a “support eARC’ setting in LG TV advanced audio menu that needed switching on. This was in addition to the main audio output selection, and all the other selections that had already been selected. 
Thanks to all for helping out. 
 

    mauiartist
    Contributor I
    July 14, 2021

    Was having a terrible time with this situation (no sound from Netflix, Disney, Prime when streaming Atmos shows) then saw this thread and changed Digital Sound Out to AUTO. I had mine set to pass through.Problem solved :-)

    Many thanks all.

    Aloha!

      rlsbk
      Lyricist I
      October 1, 2021

      I relocated my LG CX TV and Sonos Arc and couldn’t get from Dolby PCM to Atmos. Running the TV setup in the Sonos app appears to have done the trick. 

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