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Eruvatar
Contributor I
January 23, 2023

Audio cuts with Beam Gen2 + 2x One SL

Hello,

I purchased a Sonos Beam Gen2 with 2x ONE SL two weeks ago.

The Beam is connected to my LG C1 via HDMI earc, with earc enable and passthrough + bitstream set. 

Everything was working fine until a few days ago, I noticed some random audio cuts when using the PS5 (1 or 2 per hour).

I have set the following settings on the PS5: AC receiver, 5.1 and PCM. I spent all the week trying to figure out a solution:

- Disconnect and reconnect all devices one by one (LG, PS5, Beam etc.)
- Connect ONE SL via ethernet to my router
- Switch the HDMI port of the PS5

For the record, I use the HDMI cables that came with Sonos Beam and the PS5.

After all this testing, I noticed:

- I had no sound on the PS5 with the PCM 5.1 signal: I had to switch to 7.1 or Dolby/DTS to get sound again, or I had to restart my TV.
- The audio cuts now occur every 30 seconds on the PS5.

I decided to reset my LG C1 and reconfigure everything, since:

- I no longer have these cuts every 30 seconds on the PS5 but I haven't played a long session to confirm that they are completely gone.
- I still have the problem on the Nintendo Switch, audio cuts every 30 seconds in surround mode (PCM 5.1).

I contacted Sonos support who were not very helpful, they said it was probably an issue with the LG C1 firmware and asked me to contact them.
I have no issue when watching movies/youtube no matter what signal I use (dolby atmos, dolby digital, dts, stero), it seems to be exclusively with PCM 5.1. 

Do you have any ideas or suggestions?

Thanks a lot,

 

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Pinned Reply By Corry P

Hi @Eruvatar 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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17 replies

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PhaseModS
Lyricist III
March 2, 2023

If the ‘other’ A/V devices seem to be working fine, but the Nintendo switch isn’t, I’m surprised you contacted Sonos Support - I would have personally started by contacting Nintendo. Then moved onto the ‘man-in-the-middle’, which is LG Support for the C1 TV, particularly as the Sonos HT product is the last thing connected in this instance and playing okay with the other products. The Beam can only play the audio as soon as it receives it. Which makes me think it’s something more likely ‘upstream’, rather than the Sonos device in this instance.

Yeah this isn’t true. This thread shouldn’t be shown as answered. It isn’t a Switch issue, it’s a PCM 5.1 issue that Sonos refuses to fix or comment on.

OmriP
Lyricist III
March 3, 2023

Have the same issue with the LG G2.

It didn’t occur on my C9 previously.

It seems to be a problem with the G1-2, C1-2 because they use a different chipset from the C9.

I’ve commented on the other thread linked here. Spoken with Sonos support today and sent them diagnostic, they’ve promised to look into it.

No firmware update to my TV has fixed the issue so far, and it occurs with every 5.1 PCM audio source so it’s got nothing to do with your switch or ps5.

Did you have the chance to test the firmware update LG mentioned? Which version is it? Did it help?

    prionico
    Lyricist I
    April 14, 2023

    Same issue here with the following setup:

    Nintendo Switch / Apple TV → LG C1 → SONOS Beam Gen 2

     

    At one point I could see the cutouts exactly every 60 seconds while playing BotW. So I contacted SONOS support and they analyzed the support files. It appears that from the perspective of the Beam the input signal just drops.

     

    So at this point I am focusing on the TV as the culprit. Somehow I am wondering if the uncompressed LPCM signal is filling up some kind of buffer on the TV which gets dropped at regular intervals because the processor is unable to pass through the audio signal fast enough.

    And I also observed a difference between the different HDMI ports. Some are behaving worse than others.

      mjsound
      Lyricist III
      May 9, 2023

      Have the same issue. Lg G2 with a Sonos beam (gen 2) and 2 One SL. Have the ps5 set to 5.1 and get audio dropouts every min. 
       

      also happens on Nintendo switch when in surround mode. 
       

      seems to be an issue with the beam as arc users don’t seem to be reporting this issue

        vjk
        Avid Contributor I
        May 10, 2023

        Toggle between SonosNet and Wifi - ie if you using Wifi, try SonosNet or vice versa. There is a help article on Sonos Support on how to do this. Can’t seem to be able to paste links here.

        Airgetlam
        Airgetlam
        May 10, 2023

        Do you mean The wireless and wired systems FAQ? 

        Bruce
        Corry P
        Corry PPinned
        Sonos Staff
        June 2, 2023

        Hi @Eruvatar 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.

        "Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein
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