Contributor I

Answered

LPCM ETA for Arc?

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LG has released a firmware upgrade for the B9/C9/E9 supporting multichannel PCM passthrough. This is great except Arc doesn’t support it yet.

Because of this new update, my Apple TV decides it should use LPCM instead of Dolby Digital 5.1 with Atmos enabled resulting in only 2.0 audio for non Atmos content. The current only workaround is to disable Atmos and enable it when you want to watch an Atmos file. Very frustrating as the previous firmware had no issue.

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DitteAnswer

Hi all,

We hear you. With a software update today, Arc now supports multi-channel LPCM, bringing new immersive sound experiences for gaming, Blu-ray discs, and more. To get support for multi-channel LPCM on Arc, download the latest Sonos S2 update from the app store and then update your system in the Sonos S2 app. After updating the app, go to Settings > System > System Updates > Check for Updates.

All the best,

Ditte

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nst

Lyricist II

Hi all.

I just wanted to add my experience.

Its been driving me mad having the same setup with the addition of a Fire Stick 4k…. no problems with my Sonos beam… but when I updated to the Arc I have been having some really random problems.

Before I go into detail… I want to reiterate what someone else has just said… at ALL times playing content purchased from the iTunes store such as 4K ATMOS movies they work fine.. and the ARC outputs in Atmos.

My problems stemmed from other apps on the AppleTV. Netflix, and Amazon Prime. Movies that were supposed to be 5.1 were coming out 2,0. Atmos content was not working at all, and mostly coming out at 2.0. Then, it decided to loose the centre channel so I could not hear the dialogue.

Researching the problem, I found this thread.

I grudging accepted that I could not diagnose the issue and I started to use the Fire Stick (which has no problem outputting to the ARC in atmos) or the inbuilt LG apps (My LG is the OLED 2019 model with eARC)

This is so frustrating as ive checked my settings over and over… and there is something that just doesn't work. Lots like this LPCM issue with the arc is to blame and I hope they fix it soon.

However… as I said.. ive got no problems whatsoever with iTunes content… its the only app on the TV that seems to do it correctly. I just cant get my head around why one app works from the same box, and the others dont.

That explains it for me then as to why it works fine, as I only use it for the iTunes purchased stuff.

I just cant get my head around the problem.

The AppleTV is clearly capable of sending and ATMOS soundtrack to the ARC via the LG eARC port… and it clearly works for iTunes content... However other apps from the same AppleTV do not work at all with varying degrees of weirdness.

Its certainly to do with firmware and correct format support but we are talking about 3 devices that are involved in this chain and the fault could be with any one of them.

So annoying at this is designed to be super simple - and yet its not.

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jamesgbeaumont

Contributor I

Hi, I posted a brief update about this here on a related thread but the forum doesn't let me duplicate the post.

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nst

Lyricist II

Hi, I posted a brief update about this here on a related thread but the forum doesn't let me duplicate the post.

Thank you

It certainly seems to be the case that this is the root cause of the problems.

Confusing it works sometimes for some content on the appleTV and not others.

Anyway, promising news.

One thing… i wonder if they can preemptively let us know its working and to give it a try? Its a bit hit and miss checking and finding it not working. It would be nice to get an official announcement when its done and we can set about checking it.

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John M

Sonos Staff

We are actively testing multi-channel LPCM on Sonos and we'll be releasing it as part of a software update by the end of this year. We will update this thread again once it's available.

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ledzep1

Headliner II

We are actively testing multi-channel LPCM on Sonos and we'll be releasing it as part of a software update by the end of this year. We will update this thread again once it's available.

Excellent news, thanks for the update.

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Naekyr

Enthusiast II

We are actively testing multi-channel LPCM on Sonos and we'll be releasing it as part of a software update by the end of this year. We will update this thread again once it's available.

Well you’ve got yourself another customer if that update is released :) I’ve been looking forward to replacing the Playbar.

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STA66S

Lyricist I

We are actively testing multi-channel LPCM on Sonos and we'll be releasing it as part of a software update by the end of this year. We will update this thread again once it's available.

Excellent news, thanks for the update.

Is this coming to the Beam?

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cowieson

Lyricist III

We are actively testing multi-channel LPCM on Sonos and we'll be releasing it as part of a software update by the end of this year. We will update this thread again once it's available.

Fantastic, can’t wait!

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wassindabox

Lyricist II

Just adding myself to get notifications

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gallister

Lyricist II

Their CEO replied to a tweet saying they hope to have it out next month. Fingers crossed.

https://twitter.com/Patrick_Spence/status/1319378961797820417