Sonos Staff

Please read if you have encountered issues with 7.1 LPCM playback on Sonos via an LG TV

Forum|Forum|4 years ago
April 11, 2022
75 replies
11342 views

Hi,

We want to gather some details from people experiencing issues with playback of 7.1 LPCM audio streams on a Sonos Arc or Beam (Generation 2), via an LG television set. Specifically, when channels are playing from the wrong speakers - for example, but not limited to, if you hear dialogue only coming from the rear speakers, consistently.

If you have experienced this channel mis-mapping, please provide, in this thread, the following details:

Your LG TV model number

Your media source device name and model number or TV app that the issue was noticed on, and the name of the movie/show that was affected

Models of any other HDMI devices connected to the TV (if applicable)

The confirmation number of a Sonos system diagnostic submitted while the affected media was playing and 7.1 LPCM was reported in the Sonos app.

Thank you for your assistance.

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ste_ms

Enthusiast I

I’m not sure whether channels are being played back correctly but I definitely get the app reporting 7.1 when I play 5.1 content

LG 65CX

Source: Apple TV 4K (2021)

Content: Disney+ Dolby 5.1 Walking Dead

Also plugged in to the TV: PS5

Diagnostic 1721739950

Corry PAuthor

Sonos Staff

Hi @ste_ms

Thank you, but to clarify, we want to know about any instances where the channels are definitely playing from the wrong locations.

It seems the LG TVs will convert to 7.1 anyway, but if there are issues with channels mapping to the wrong location we’d really like to know about it.

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

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ste_ms

Enthusiast I

No worries just wanted to make sure that you got some responses to this - hopefully some of the affected users from the other threads will pitch in here as it would be a shame to let this fizzle out, thanks.

C

christo_geo

Lyricist I

Thank GOD this is finally being properly looked into. I get this on ALL my devices plugged into HDMI port

LG CX 65 inch TV

Sonos Arc

Source(s):

Apple TV 4K

PlayStation 5 (even if I select 5.1 lpcm it outputs as multichannel pcm 7.1)

Xbox Series X (same as above - if not using Atmos (the atmos delay on the series x is insane hence not using it)

LG UBX 90 4K UHD Blu Ray Player

Apple TV content: anything that is meant to be Dolby Digital 5.1 will output as Multichannel PCM 7.1 - regardless of App

diagnostic: 1122099704

(while playing Lost in Translation from iTunes Store)

happy to provide diagnostics from other content/sources/app if needed as I’m so desperate for this to be fixed! It’s been over 2 years now!

J

JefDc

Contributor II

Hello, I have the same problem …

I have an lg c1, sonos arc + 2 One + sub.
The sound comes out in 7.1 instead of 5.1 on Netflix, Disney + and Amazon prime. But also on ps5.

If I disable eArc i am in dd 5.1. With the eArc activity I am in multichannel pcm 7.1

E

efrem81

Lyricist III

hi i have the same problem, tv lg c1 sonos arc and 2 one sl. Apple TV 4K 2021 I get LPCM 7.1 track although it should be 5.1 from any source connected to any HDMI on the tv. I can say that it is a problem of lg because the same thing happens if I connect a Denon 2600h amplifier to the TV it receives 7.1 tracks instead of 5.1.

Corry PAuthor

Sonos Staff

Hi @efrem81 & @JefDc

Please describe the way in which your 7.1 playback results in mis-mapped channels. Thanks.

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

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efrem81

Lyricist III

with playback in LPCM 7.1 you lose a noticeable power output on all channels, I have to turn up the volume a lot this happens if eARC and passtrough are enabled on the TV, no exchange of channels in my case .. while if on the TV you set audio output to auto, the Arc receives audio correctly in 5.1 with a much higher sound power, in line with the audio that can be obtained by passing directly from the apps installed natively on the TV.

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ste_ms

Enthusiast I

with playback in LPCM 7.1 you lose a noticeable power output on all channels, I have to turn up the volume a lot this happens if eARC and passtrough are enabled on the TV, no exchange of channels in my case .. while if on the TV you set audio output to auto, the Arc receives audio correctly in 5.1 with a much higher sound power, in line with the audio that can be obtained by passing directly from the apps installed natively on the TV.

Interested in this, I have similarly not noticed channels being swapped but have felt that the volume needs to be turned up more than I would expect but I put that down to the difference between PCM and DD 5.1

E

efrem81

Lyricist III

with playback in LPCM 7.1 you lose a noticeable power output on all channels, I have to turn up the volume a lot this happens if eARC and passtrough are enabled on the TV, no exchange of channels in my case .. while if on the TV you set audio output to auto, the Arc receives audio correctly in 5.1 with a much higher sound power, in line with the audio that can be obtained by passing directly from the apps installed natively on the TV.

Interested in this, I have similarly not noticed channels being swapped but have felt that the volume needs to be turned up more than I would expect but I put that down to the difference between PCM and DD 5.1

there should be no difference between Dolby 5.1 and PCM, as PCM is nothing more than the track already decoded by the source

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