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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Dwarrelpoot

Trending Lyricist I

You can’t adjust the surround volume for the surrounds in the controller app? I’ve not tried recently, as I’ve not perceived any changes in either of my surround setups.

Nope. The surround distance setting changes nothing. You can set it to whatever you like, but with trueplay enabled it sticks to the 3 meter + setting

Airgetlam

Sorry, I wasn’t talking about distance, but volume. The complaint, as I read it, was ‘way too loud’, which I would assume could be addressed by adjusting the volume of the surrounds, not the distance.

Bruce

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Dwarrelpoot

Trending Lyricist I

Yeah adjusting volume works. But sometimes it just randomly changes without touching the settings.

anyway, the dropouts are GONE!! It’s still working just fine with the original HDMI cable. Super nice!

Fendera

Lyricist III

Yeah adjusting volume works. But sometimes it just randomly changes without touching the settings.

anyway, the dropouts are GONE!! It’s still working just fine with the original HDMI cable. Super nice!

Can you please share more information on which TV and soundbar you have?

R

RANDUSR23296

Enthusiast I

Just to update my post from 14 days ago - still no audio drops on my C2.

I’ve been unable to reproduce for at about 6 months now. Unfortunately I was not able to pin this to a f/w update on either Sonos or LG side (but I’m suspecting LG given Sonos’ response last year).

if it does, LG seems to have been the culprit then, or the fixer. Idk.

I was able to trigger the issue by switching incoming audio modes on the eARC HDMI2 input which would drop the audio streams from HDMI 3/4, so there was definitely a “feature” in the LG TV. However, the only eARC device I tried that would also trigger this feature was Beam 2 so suspect it was also within Sonos’ gift to at least suppress this behaviour even if they deemed no bug on their side. I will try to find the time to repeat the Raspberry Pi tests to see if the LG behaviour has been changed.

J

JohnF87

Avid Contributor I

Looks like no fix in 15.2, disappointing as I hoped this would be the one.

That is disappointing. At least my workaround is still working (see my previous posts if you haven’t already), so I’m happy enough that it will no longer cause me issues. I’ll still follow this for a proper fix though.

For anyone interested, this is a the cable I’m using which fixed the problem for me.
https://www.amazon.co.uk/dp/B09YPR5SD4

I really hoped this cable fixed it. But to bad. Drops seem to be less. But still there… i have a samsung s95c tv. Think I will try a hdmi 2.1 switch with audio earc out. Only option left to make full use of earc without interruption

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