Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

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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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ste_ms

Enthusiast I

The cable has worked for me for about the last month (the original one linked from Amazon). It seems to be stopping the Beam from interrupting the main audio signal whilst still maintaining eArc functionality as there are still copper lanes in the cable as well as the fibre optic.

Still disappointed in the dreadful communication from Sonos but lesson learned for the future, if you are in the return period it might be worth considering as Sonos clearly can’t or won’t fix this.

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OmriP

Lyricist III

Can you link the correct cable again here? Preferably from the UK Amazon since the American one doesn’t ship here.

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ste_ms

Enthusiast I

https://amzn.eu/d/i7OSKuo

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mjsound

Lyricist III

So I assume you only need to get one of these cables between the sound bar and tv. The rest can be other HDMI 2.1 cables. Just asking as I have a G series OLED and they are a bit of a pain to plug new cables in to.

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ste_ms

Enthusiast I

So I assume you only need to get one of these cables between the sound bar and tv. The rest can be other HDMI 2.1 cables. Just asking as I have a G series OLED and they are a bit of a pain to plug new cables in to.

Yes, taking care to get it the right way round i.e. source at TV end

O

OmriP

Lyricist III

https://amzn.eu/d/i7OSKuo

Dang it’s also unavailable…

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OmriP

Lyricist III

Is this one good?

https://a.co/d/3ulDEy2

It was linked here before, and I can order it, not sure whether it works though.

Y

yofalat611

Enthusiast I

Reporting back that in my experience, HDMI 1 is not perfect. I encounter dropouts with PCM 5.1 once every… I wanna say 30 to 60 mins. Haven’t bothered timing it to see if it’s consistent but it’s always there. Happens at least once whenever I watch a TV series (per episode) or movie. There was this one time when the dropout occured every 10 mins but a quick restart of my devices changed it back to “normal.”

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TheCaseAce

Lyricist II

One of the previous posts mentioned this issue occurs particularly when the device is connected to either of ports 3 or 4 on the back on a LG C2/G2.

I tried using post 1 with my Nintendo Switch set to ‘surround sound’ (LPCM5.1) and it seemed to work for at least half an hour.

Has anyone else had a similar experience to this with other LPCM5.1 devices?

I’m curious about whether I need the cable or need to just permanently switch the inputs. Also if anyone know what might be special about ports 1 & 2 on an LGC2 TV that would be useful (considering all 4 ports are labelled as 4k 120Hz HDMI 2.1 ports).

Y

yofalat611

Enthusiast I

I’m curious about whether I need the cable or need to just permanently switch the inputs. Also if anyone know what might be special about ports 1 & 2 on an LGC2 TV that would be useful (considering all 4 ports are labelled as 4k 120Hz HDMI 2.1 ports).

My 2 cents (and this is what I’m doing): If using HDMI1 is good enough for you, then hold off on buying the cable for as long as you can. In case the cable workaround has its own bug or IF Sonos decides to address to issue lol.

And then when you finally find the HDMI1 workaround insufficient/intolerable, then buy the cable.

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