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Zophop
Trending Lyricist I
June 10, 2020

LG C9 and Sonos Arc

Hey all, my Arc was delivered this morning and I've had a chance to hook it up to my LG C9 directly via eARC and ran a few tests regarding Atmos and other features.

Built in apps:

  • Netflix - Reporting Dolby Atmos (DD+) for Atmos content.

  • Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU)

  • Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.

Xbox One:

  • HDMI Audio set to Bitstream out and Bistream Format set to Dolby Atmos has no delay, finally! Displays Dolby Atmos in Sonos app.

PS4:

  • Like with the Xbox, there's no delay on Bitstream HDMI audio

NVidia Shield Pro:

  • Netflix - Reporting Dolby Atmos (DD+) for Atmos content.

  • Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.

  • Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU). After connecting up to a US VPN it's reporting Dolby Atmos (DD+) for Atmos content.

  • PLEX - This is where it gets slightly annoying. Playing TrueHD content it reports Stereo 2.0. Setting Passthrough to HDMI reports Dolby Atmos (TrueHD). For DTS content you need to switch the Passthrough setting to Optical which in turn causes TrueHD to playback in Dolby Digital Plus 5.1.

Apple TV:

  • iTunes Content - Reports Dolby Atmos for Atmos content. Non Atmos content reports Stereo 2.0. With Change Format > On and New Format > Dolby Digital 5.1, I receive Dolby Digital 5.1 from non-Atmos iTunes content. I ran this test using Beetlejuice and Avengers Assemble.

  • Netflix - Reports Dolby Atmos for Atmos content.

  • Amazon Prime - Reports Dolby Atmos for Atmos content.

  • Disney+ - Reporting Stereo 2.0 for all content bizarrely. Setting audio output on the Apple TV to Dolby 5.1 allows all content to playback in 5.1 rather than stereo.

My C9 is running firmware 04.80.03 with the following settings:

Sound Out

HDMI ARC selected

Digital Sound Out set to Passthrough

eARC set to ON

Additional Settings

DTV Audio Setting set to Auto

HDMI Input Audio Format set to Bitstream.

 

If there's anything else I can test or any questions, let me know!

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    134 replies

    Show previous replies
    midimo123
    Lyricist I
    June 19, 2020

    Everything (ATV 4, SkyQ, netflix and Amazon Prime with build in Apps, with my LG C9 newest firmware) is working now.

    Settings:

     

    LG: Earc on / pass through / all HDMI inputs on bitstream (Arc using HDMI 2)

    SkyQ: output HDMI Dolby DIgital +

    Apple TV4: Format Atmos on (if no Atmos for your language you have to select Dolby Digital  to get the whole sound)

    Netflix/Amazon Prime working with build in apps descriptions Dolby Atmos (DD+) but you need Netflix premium for Atmos

     

      svomak
      Enthusiast II
      June 19, 2020

      Any ETA on the fix for the Arc with LG 04.80.03?

      Augie Palumbo
      Lyricist II
      June 20, 2020

      First off thanks for the info .

      I have the same config on my C9 as you spelled out. Streaming tidal in Atmos works great as does prime, Disney and Netflix.

      Trouble I have is with a Sony Blu Ray. I'm playing  The Beatles Abby Road in Dolby Atmos but Blu Ray will not switch from PCM to Atmos. I've tried all troubleshooting on the blu ray and checked it all. 

       

      Even did a system reset on the blu ray audio and then set it based on info from two sources, Sony and LG. 

       

      No luck. Still sounds great but I would really like to see the Blu Ray switch to Atmos.

       

      Any thoughts?

      oriboaz
      Prodigy I
      June 20, 2020

      Hi guys, new Sonos owner here and I’m having trouble getting Atmos to work consistently.  My ARC + Sub is hooked up to my 2019 LG C9, but I’m not experiencing the same level of success reported by many others.  I can’t seem to find the root cause, so I was hoping for guidance/help.

      Apple TV 4K

      • Plex: reports DD 5.1 (no Atmos)
      • Netflix: DD 5.1
      • Prime: DD 5.1

      Am I missing something? Netflix may be a subscription issue, but I have no idea why Plex isn’t working on the ATV (since it’s working fine via the shield and internal app).  

      On Apple TV, go to Settings → video and audio → Audio Format

      and set ‘change format’ to off. 

        david82
        david82
        Collaborator II
        June 20, 2020

        First off thanks for the info .

        I have the same config on my C9 as you spelled out. Streaming tidal in Atmos works great as does prime, Disney and Netflix.

        Trouble I have is with a Sony Blu Ray. I'm playing  The Beatles Abby Road in Dolby Atmos but Blu Ray will not switch from PCM to Atmos. I've tried all troubleshooting on the blu ray and checked it all. 

         

        Even did a system reset on the blu ray audio and then set it based on info from two sources, Sony and LG. 

         

        No luck. Still sounds great but I would really like to see the Blu Ray switch to Atmos.

         

        Any thoughts?

        you don’t mention which actual Sony BDP model you have so i just looked at the manual for UBP-X800M2, searched for and found Atmos in the troubleshooting section on page 29 where it mentions:

        The HD Audio (Dolby Digital Plus, Dolby
        TrueHD, DTS-HD High Resolution Audio,
        DTS-HD Master Audio, Dolby Atmos*2 and
        DTS:X*3) is not output by bitstream.
        • Set [BD Secondary Audio] in [Audio
        Settings] to [Off] (page 24).
        • Check that the Sound Bar/AV amplifier
        (receiver) is compatible with each HD Audio
        format.

        this might be an issue if your device is playing out PCM instead of Bitstream. on the LG C9 side, while you have the Sony BDP input active, check that Settings>Sound>Additional Settings>HDMI Input Audio Format for all inputs is set to Bitstream. all of the inputs are listed but you can only change the active input.

        Augie Palumbo
        Lyricist II
        June 20, 2020

        Thanks. It's a Sony BDP-S6700. I did check the manual and have set BD Audio mixing to off per my interpretation, and some other sites and forums. 

         

        No AV receiver. Blu Ray to HDMI 3 on LG then HDMI Arc with eArc turned on to Sonos. 

        All the HDMI inputs are bitstream. 

        Blu Ray is specifically Dolby Atmos so nothing I can see there . 

        My assumption of course is that the TV can decode. I do have an AV receiver and could hook it up but again didn't think I needed it

         

        Thanks

         

         

        david82
        david82
        Collaborator II
        June 20, 2020

        sorry, i didn't mean to confuse the issue of the AV receiver - just wanted to include that line since its the full portion of the troubleshooting note. the main point was for disabling any secondary audio that might include formats that aren't dolby (i.e. DTS).

        a receiver would just add a new device to the puzzle.

        this sounds like a question for sony tech support.

        Augie Palumbo
        Lyricist II
        June 20, 2020

        I appreciate the help and I will hit them up.

         

        Have a great weekend

          Pavan
          Lyricist I
          June 21, 2020

          That is bizarre. I just turned earc off set pass through to no and played it. Turned them back on again and i now have atmos..Thanks for testing this for me zophop its much appreciated. So its all working on my B9 if anyone wants anything testing :-)

          I have the same issue. I tried changing the eArc to off and Digital Sound Out to PCM from Passthrough ( I see Passthrough, Auto and PCM options only) and played Underground 6 and changed those back to Passthrough and eArc to On. Still all my apps are playing only in Dolby Vision and not Atmos 😞

          ledzep1
          Headliner II
          June 22, 2020

          So I have the LG CX 

          and use Apple TV 4K and Oppo203 player

           

          Will I get this issue with 5.1 and stereo that I have read on here. I’m amazed that some of these sound issues still exist, would I be best holding off purchasing until Sonos have updated the ARC with this LPCM fix.

           

           

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