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throwawaybeam2
Trending Lyricist I
June 29, 2022

Multichannel PCM 5.1 dropping out since 14.10 update

Anyone else experiencing the same issue? Multichannel PCM 5.1 blanks out for a second every 1-2 minutes. I don’t think it’s a bandwidth issue as it works flawlessly with Multichannel PCM 7.1 (thorough test) and Dolby TrueHD Atmos (quick test). And it may have been caused by the Sonos 14.10 update. Setup is PS5→ LG C1→ Beam 2 (via earc).

 

2 weeks ago before the 14.10 update, I watched a bluray film wherein I had my PS5 transcode the DTS-HD MA 5.1 audio to Multichannel PCM 5.1 (as the C1 does not support DTS) and had no issues. Earlier today, I played a bluray film for the first time in 2 weeks and I encountered consistent audio dropouts every 1-2 minutes. It had the same setup where DTS-HD MA 5.1 → Multichannel PCM 5.1. I tested other bluray discs including the one I watched 2 weeks ago and they all now have the same issue.

 

Curiously, I’ve been gaming heavily on my PS5 the past two 2 weeks and haven’t had any audio issues. Then I realized that I’ve been using Multichannel PCM 7.1 when gaming on my PS5. So I made some changes under the PS5 sound settings to make it output Multichannel PCM 5.1 instead. Lo and behold, I am now getting the same consistent dropouts in games and even on the PS5 main menu.

 

I think it’s due to the Sonos 14.10 update as that’s the only firmware update I’ve done in the last 2 weeks. No PS5 update, no LG C1 update. Well actually while I was composing this post, I received and applied the latest LG C1 firmware update and I still have the same issue.

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    Pinned Reply By Corry P

    Hi @throwawaybeam2 et al

    We now recommend you reach out to the TV manufacturer (LG) as this behaviour is also occurring with different soundbar manufacturers (so it’s not a Sonos-specific issue).

    Alternatively, please utilize different audio formats from McLPCM 5.1 (e.g., McLPCM 7.1, DD+, etc).

    I hope this helps.

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    Show previous replies
    BriainC
    Contributor I
    December 31, 2022

    I applied the update and I still have the issue. I think I read somewhere that HDMI-CEC might be broken. I'm going to try restarting everything and see if that helps. I can't disable CEC on the TV while the Beam is plugged in.

    Ariel47
    Lyricist III
    January 1, 2023

    After two days the issue returned unfortunately

    Addnan
    Lyricist II
    January 4, 2023

    I am losing my mind trying to fix this. Been going on for so long. it suddenly starts working for a period and then restarts again. Beam 2, One, and Sub 3 with LG CX

    BriainC
    Contributor I
    January 4, 2023

    I feel like we can't narrow down what hardware is causing this issue. It could be Sonos or LG.

    Does anyone have an eArc soundbar from another manufacturer they could test with 5.1 pcm?

    RANDUSR23296
    Enthusiast I
    January 4, 2023

    Beam 2, One, and Sub 3 with LG CX

    I feel like we can't narrow down what hardware is causing this issue. It could be Sonos or LG.

    If I remember the posts on this thread correctly, on the Sonos side it seems limited to Beam 2 reporting issues with the C1, and now CX. Several users have reported no issues with the Sonos Arc (it’s a frustrating name to search amongst ARC, eARC and Arcana...).

    Does anyone have an eArc soundbar from another manufacturer they could test with 5.1 pcm?

    I may be able to run a brief test on an eARC enabled AVR soon, although if I don’t hear the dropouts that won’t prove much.

      Addnan
      Lyricist II
      January 5, 2023

      Was troubleshooting with chat for the last hour or so. We got to this, “We can see clearly where the initial audio format, that should be fine, changes to something unsupported, causing the audio issue to start, since we cannot decode the forma.”

      Chat support not able to troubleshoot further said I would need to talk to phone support, so I guess I will try that when they are open.

        ste_ms
        Enthusiast I
        January 9, 2023

        I wanted to wait until the new firmware arrived for the CX but it hasn’t fixed this issue, surely Sonos can look further into this and respond here in the forums? 

        Addnan
        Lyricist II
        January 9, 2023

        Annoyingly… The fault has stopped again so I can’t call them right now. Just waiting for it to break again. 🙄

        RANDUSR23296
        Enthusiast I
        January 9, 2023

        Annoyingly… The fault has stopped again so I can’t call them right now. Just waiting for it to break again. 🙄

        Same here, so I’m now holding off upgrading the LG firmware and wiring in the eArc amplifier until it returns.

        kikeminchas
        Lyricist III
        January 12, 2023

        If you want the issue to reappear again try unplugging and plugging again the beam2/arc from the mains. I have done this for the night multiple times when there was no issue only to find it had returned following morning.

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