PS4 Pro outputting PCM via LG CX shows Multichannel PCM 7.1 for Sonos Arc, but rear surrounds have no audio

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Corry P
Userlevel 7
Badge +18

Hi @billiejoe87 

I really strongly believe that Sonos is unintentionally misleading us with their supposed fix for this issue.

Sonos will add downconversion for LPCM 7.1 to LPCM 5.1, however I think the issue with LG TV’s incorrectly sending all LPCM audio as LPCM 7.1 won’t be fixed as it’s an LG problem. The LG’s wrongly send all LPCM as LPCM 7.1 even if it’s only LPCM 5.1 audio.

I really hope I’m wrong, but I feel Sonos announcement that the issue was on their own end has made everyone not put pressure on LG to fix their own issue with incorrectly sending the wrong audio. As someone else here said, if you use a HDFury device or a Sony TV the issue goes away. 

To be clear, I was addressing the original post, in which PCM was being selected as the output format on the source device.

If your LG TV is converting another format to 7.1 LPCM without being told to, then that is indeed an issue with the TV.

Is it really asking much for Sonos to contact LG and make them aware of the issue for all LG owners that own the Sonos Arc?

No, but it would not count as much as numerous LG TV owners getting in touch and doing the same. If we were to inform them (and perhaps we have already), but there wasn’t a significant volume of LG customers getting in touch with LG about the same issue, they wouldn’t take it as a priority. Customer contact volume is the only thing that will drive them assign the problem with a higher priority. I therefore recommend that you do get in touch with LG.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein
L
Userlevel 5
Badge +11

I really strongly believe that Sonos is unintentionally misleading us with their supposed fix for this issue.

Sonos will add downconversion for LPCM 7.1 to LPCM 5.1, however I think the issue with LG TV’s incorrectly sending all LPCM audio as LPCM 7.1 won’t be fixed as it’s an LG problem. The LG’s wrongly send all LPCM as LPCM 7.1 even if it’s only LPCM 5.1 audio.

I really hope I’m wrong, but I feel Sonos announcement that the issue was on their own end has made everyone not put pressure on LG to fix their own issue with incorrectly sending the wrong audio. As someone else here said, if you use a HDFury device or a Sony TV the issue goes away.

 

Well said.

 

I have tried contacting LG about the issue but 1st line support don’t seem to grasp what the issue is I’m trying to explain to them, and reply to my emails with some nonsense unrelated to the issue.

This was why I recently asked Sonos support on here if they could help and contact LG to try and get the issue resolved, at the end of the day it might be an LG issue, but sound still comes out a Sonos speaker. 

I find it sad that Sonos seem to wash their hands of issues if it’s not related to their devices, despite that device being in the chain and playing a big part in the actual issue.

Which is why I believe Sonos could help us solve the issue by contacting LG as well to highlight the issue to them with a bit more weight behind it, (being sonos and all).

Is it really asking much for Sonos to contact LG and make them aware of the issue for all LG owners that own the Sonos Arc?

J

What does the HD fury do to it?  I’m not really wanting to try and fit this behind my setup too

B
Userlevel 4
Badge +7

I really strongly believe that Sonos is unintentionally misleading us with their supposed fix for this issue.

Sonos will add downconversion for LPCM 7.1 to LPCM 5.1, however I think the issue with LG TV’s incorrectly sending all LPCM audio as LPCM 7.1 won’t be fixed as it’s an LG problem. The LG’s wrongly send all LPCM as LPCM 7.1 even if it’s only LPCM 5.1 audio.

I really hope I’m wrong, but I feel Sonos announcement that the issue was on their own end has made everyone not put pressure on LG to fix their own issue with incorrectly sending the wrong audio. As someone else here said, if you use a HDFury device or a Sony TV the issue goes away.

1 x Arc, 1 x Beam Gen 2, 1 x Amp, 2 x Sonos In Ceiling Speakers, 2 x Sub, 9 x Sonos Ones, 5 x Symfonisk Lamp
J

Is this still on track for a fix this summer?  I noticed it today with a 2021 Apple TV 4K and lg CX77 also.  Figured the new model might be better but same issue. Have been getting around Ps5 issue by switching to “Dolby” on that one 

B
Badge

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you

Yes it is only with the LG BX/CX/GX from what I can tell.

My Sony A8H with eARC passes 5.1 PCM without any issues from the Apple TV, Nintendo Switch etc. My LG CX always had the 7.1 PCM issue.

Add it to the list of issues with the LG CX. Thankfully, generally LG end up patching their issues eventually even though they often break other things in the process.

For me, I’d rather not deal with the level of incompetence LG brings to such expensive products. They’ve always had issues with Sonos equipment in terms of dropouts, lip sync etc.

 

I have a LG GX on firmware 03.21.18 and connecting the Sonos Arc directly with the eArc port of the LG GX and using the Apple TV 4k on tvOS 14.5, i have the same problem. However, after connecting the Sonos Arc via the HDfury Arcana, the output is correctly multichannel pcm 5.1 again.

 

So i think it’s an issue in combination with the LG. For me the learning is clear - i’ll never be not using an HDfury product from now on. ;)

I
Userlevel 2
Badge +1

I emailed their CEO earlier today and received a response back from one of their senior software engineers 

 

“Patrick forwarded your Email concerning LPCM down-mix issues and I can give you an update on that. The engineering team is currently working on the issue as we speak. There are two steps here, one is to correct the downmixing in the case where there are no discrete surrounds and the other is when there are discrete surrounds. We have completed the first step and we are testing the fix and now working on the second step.

 

At this time I am unable to give you an exact date for availability of the SW fix but know that we are addressing it and when I know more, I will let you know.”

 

 

Hopefully it’s not that far away

UPDATE: (not a good one sadly)

 

My apologies for not replying, things are hectic here and it fell through the cracks.

 

The fix is still undergoing testing. Due to the way we handle SW releases, we are expecting these fixes to turn up in our July SW update.

O

It’s really just a software issue, so I see no reason for 7.1 downmixing support not to arrive on the Arc. As for how long it will take, I don’t have that information.

Generally, Sonos will not say anything about a feature until it’s already ready. As we’re already confirming we’re working on this, we’re committed and the Arc will downmix 7.1 LPCM at some point. The official line is “This is a feature we are currently working on, however; we do not have any further information to share with you at this time. Rest assured, we will address this in a forthcoming update.”

So, you should be good to keep your Arc beyond the return period.

Thank you for your reply. Just placed an order for an Arc :sunglasses:

Corry P
Userlevel 7
Badge +18

Can you confirm that a fix will for sure be coming, and that it’s only a matter of time? Or are you still in the process of figuring out how and if it can be fixed?

I’m asking because with the time it’s taking to fix this, I fear I might be over the 100 days return window with still no fix available.

Thanks.

It’s really just a software issue, so I see no reason for 7.1 downmixing support not to arrive on the Arc. As for how long it will take, I don’t have that information.

Generally, Sonos will not say anything about a feature until it’s already ready. As we’re already confirming we’re working on this, we’re committed and the Arc will downmix 7.1 LPCM at some point. The official line is “This is a feature we are currently working on, however; we do not have any further information to share with you at this time. Rest assured, we will address this in a forthcoming update.”

So, you should be good to keep your Arc beyond the return period.

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

Currently, Sonos does support multichannel LPCM in 5.1 mode on the Arc, but does not support multichannel LPCM in 7.1 mode - Downmixing LPCM 7.1 to 5.1 is a feature we are currently working on, however; we do not have any further information to share with you at this time. Rest assured, we will address this in a forthcoming update.

Hi Corry,

thanks for chiming in. Can you confirm that a fix will for sure be coming, and that it’s only a matter of time? Or are you still in the process of figuring out how and if it can be fixed?

I’m asking because with the time it’s taking to fix this, I fear I might be over the 100 days return window with still no fix available.

Thanks.

Corry P
Userlevel 7
Badge +18

Hi All.

As mentioned previously, this is an issue we’re aware of.

Currently, Sonos does support multichannel LPCM in 5.1 mode on the Arc, but does not support multichannel LPCM in 7.1 mode - Downmixing LPCM 7.1 to 5.1 is a feature we are currently working on, however; we do not have any further information to share with you at this time. Rest assured, we will address this in a forthcoming update.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein
P
Userlevel 4
Badge +1

Sonos support is lousy as hell.

L
Userlevel 5
Badge +11

2 weeks later and still no response from sonos support, just a simple update on the fix for this will do.

L
Userlevel 5
Badge +11

Any news on this @ Sonos support team?

 

Thanks

V

I got the latest Sonos update yesterday (version 13) and I am still experiencing the same issue where the sound is muffled when I set my Ps5 audio output to lpcm. I have a Ps5, lg cx , and Sonos arc + sub + two SL ones. I am setting my Ps5 to use bitstream Dolby for now. Also I would like to note that I am setting my Ps5 to 5.1 channels instead 7.1 as I am aware the Sonos arc supports 5.1. 

L
Userlevel 5
Badge +11

Did the latest system update version 13.0 fix this issue , has anyone tried it yet?

I believe it’s helped with dropouts for some tv owners, I will be pretty disappointed to finally get an update system side and doesn’t fix this as well.

Doesn’t fix this issue

Shame, perhaps now we have version 13, minor fixes will come along soon.

I
Userlevel 2
Badge +1

Did the latest system update version 13.0 fix this issue , has anyone tried it yet?

I believe it’s helped with dropouts for some tv owners, I will be pretty disappointed to finally get an update system side and doesn’t fix this as well.

Doesn’t fix this issue

L
Userlevel 5
Badge +11

Did the latest system update version 13.0 fix this issue , has anyone tried it yet?

I believe it’s helped with dropouts for some tv owners, I will be pretty disappointed to finally get an update system side and doesn’t fix this as well.

B
Userlevel 4
Badge +7

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you

Yes it is only with the LG BX/CX/GX from what I can tell.

My Sony A8H with eARC passes 5.1 PCM without any issues from the Apple TV, Nintendo Switch etc. My LG CX always had the 7.1 PCM issue.

Add it to the list of issues with the LG CX. Thankfully, generally LG end up patching their issues eventually even though they often break other things in the process.

For me, I’d rather not deal with the level of incompetence LG brings to such expensive products. They’ve always had issues with Sonos equipment in terms of dropouts, lip sync etc.

1 x Arc, 1 x Beam Gen 2, 1 x Amp, 2 x Sonos In Ceiling Speakers, 2 x Sub, 9 x Sonos Ones, 5 x Symfonisk Lamp
L
Userlevel 5
Badge +11

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you

You may have already been asked this, but I am curious if you have switched your TV to Auto rather than Passthrough?  Until there is an update, this may allow the audio to be sent properly to the correct channels.

I use bitstream / passthrough for everything. Guess its wait and see if this update Sonos are working on will fix it. I know they were testing it a while back so hopefully it should be released soon.

K
Userlevel 2
Badge +4

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you

You may have already been asked this, but I am curious if you have switched your TV to Auto rather than Passthrough?  Until there is an update, this may allow the audio to be sent properly to the correct channels.

N
Userlevel 5
Badge +7

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you


It's  not your TV, the Arc needs a software update to handle downmixing properly 

SONOS ARC | SONOS Sub | SONOS Play 1 x 2 | LG C9 OLED | PS5 | RTX3090 Gaming PC | Sennheiser GSP600 Headset | Audio Pro T8L Desktop Monitors
L
Userlevel 5
Badge +11

Is this issue only with the LG CX?

Anything in DD 5.1 on apple4k tv is output as multichannel pcm 7.1

Blurays on my oppo203 in 5.1  output as 7.1

setting series x to uncompressed 5.1 outputs as multichannel pcm 7.1

 

Unsure if this topic relates to the same issue, can someone from Sonos please confirm, I have had this issue since the LPCM update you released, and it would be nice to know if it is indeed an issue with the Sonos?

 

Thank you

N
Userlevel 5
Badge +7

At least they say they are testing it this time.

I’m pretty sure they did not test the LPCM update before they launched it, given that it took the community about 5 minutes to find all the problems with the downmixing lol.

I’m not having any issues for my content as I’m lucky the devices I use let me force 5.1 instead of the default 7.1 but I feel for the people that are stuck with 7.1 downmixing issues, hopefully it’s working for you soon so you can experience high fidelity surround sound on all your devices and apps.

SONOS ARC | SONOS Sub | SONOS Play 1 x 2 | LG C9 OLED | PS5 | RTX3090 Gaming PC | Sennheiser GSP600 Headset | Audio Pro T8L Desktop Monitors
I
Userlevel 2
Badge +1

I emailed their CEO earlier today and received a response back from one of their senior software engineers 

 

“Patrick forwarded your Email concerning LPCM down-mix issues and I can give you an update on that. The engineering team is currently working on the issue as we speak. There are two steps here, one is to correct the downmixing in the case where there are no discrete surrounds and the other is when there are discrete surrounds. We have completed the first step and we are testing the fix and now working on the second step.

 

At this time I am unable to give you an exact date for availability of the SW fix but know that we are addressing it and when I know more, I will let you know.”

 

 

Hopefully it’s not that far away

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