Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

516 replies
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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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pcfarrar

Lyricist III

Set my PS5 to 5.1 linear PCM and drop outs as normal every 57s, so still not fixed in 15.3….😠

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OmriP

Lyricist III

This problem just fixes itself randomly for me, but the moment the tv gets an update and does this kind of hard reset it returns, so I think the cause is in the TV. I tried talking with LG yesterday but all they offered me was to send a technician to check my TV and their local branch here in Israel said global LG has not notified them about this issue and it’s the first time they hear about it. They’ve suggested to me to contact the global LG on Facebook and try to get their attention. Maybe if we all try someone there will care…

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pcfarrar

Lyricist III

Anyone tried an LG C3 with the Beam 2 yet?

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OmriP

Lyricist III

Oh forgot to mention, the LG support asked me for a video showing the issue, but it’s currently disappeared for me so I can’t send them. Any chance one of you could make a video recording of the issue occurring?

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MJW75

Enthusiast I

Oh forgot to mention, the LG support asked me for a video showing the issue, but it’s currently disappeared for me so I can’t send them. Any chance one of you could make a video recording of the issue occurring?

This is it happening on my C2.

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Hawk780

Lyricist III

I know this sounds stupid and simple but has anyone tried a factory reset of their sonos sound system? Someone on reddit reporting similar issues appears to have fixed the issue with that.:

https://www.reddit.com/r/sonos/comments/urfhl4/comment/jbceh0r/?context=3

If all else fails I may try the fiber cable mentioned here. I assume it has to be hdmi 2.1?

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OmriP

Lyricist III

Oh forgot to mention, the LG support asked me for a video showing the issue, but it’s currently disappeared for me so I can’t send them. Any chance one of you could make a video recording of the issue occurring?

This is it happening on my C2.

Thanks, I sent them.

The problem has returned so I also recorded my own video and sent them, although in my case (LG G2) it seems that the audio drop is much shorter so the diagnostics screen doesn’t show any change when it drops.

I wouldn’t hold my breath though, I doubt anything will come out of it.

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Jonjon1239

Contributor I

Having a similar issue myself. Nintendo Switch to Phillips OLED 857, Sonos Beam Gen 2. Swapped out HDMI cables and swapped out the dock but I'm still getting a crackle when Auto or Surround is chosen in the Switch settings. The TV audio is set to Multichannel bypass, the HDMI port on the TV works fine on a 360 and my Series X plugged into another port doesn't experience any crackling sound at all. Bit of a strange one, don't want to reset my whole Sonos system again as it's a bit of a headache.

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RANDUSR23296

Enthusiast I

If all else fails I may try the fiber cable mentioned here. I assume it has to be hdmi 2.1?

No, just “with ethernet”. The eARC channel will still be bi-directional copper wires, even where the main video/audio stream is carried over one way fibre optic.

The “with ethernet” ensures that these wires are configured as twisted pair which can offer enough bandwidth for 7.1 PCM bit rates vs the original HDMI cable design.

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Hawk780

Lyricist III

If all else fails I may try the fiber cable mentioned here. I assume it has to be hdmi 2.1?

No, just “with ethernet”. The eARC channel will still be bi-directional copper wires, even where the main video/audio stream is carried over one way fibre optic.

The “with ethernet” ensures that these wires are configured as twisted pair which can offer enough bandwidth for 7.1 PCM bit rates vs the original HDMI cable design.

Sorry - I may not be as tech savvy as everyone here but just to clarify what this means - is it something like this?

https://www.amazon.com/gp/aw/d/B09KGSG5VW?ref=ppx_pt2_mob_b_prod_image

I am seeing extremely pricey long range ones and this was the most reasonably priced fiber one way cable. Not sure what I am searching for and this is the closest I can find from what was discussed in this forumn which is not like $60 - $100.

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