Contributor I

Answered

LPCM ETA for Arc?

206 replies
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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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batsabode

Lyricist III

Hi everyone - for what it’s worth, my brother (who is in the same situation) emailed Patrick Spence (Sonos CEO) and got a reply stating that LPCM will be supported and the update will be coming “this year”. So far the only other source stating this has been a post on this forum (I believe) so this might give people more confidence that the functionality is indeed lined up for the near future. I don’t think it’s a totally safe bet until they’ve shipped the update but it’s looking more positive.

This years could be another 5 months! Why the hell wasn't this thought about long before they shipped the ARC, surely they must have had a bunch of ways to send Atmos to the Sonos Arc studied and if so that makes it even more unreasonable for them to send them out without the ability to work with a bunch of inputs. I get that so far they still dont support DTS due to having to pay licensing but LPCM doesn't require a fee and is generally an accepted inout due to many other streaming boxes using the MAT format

S

svomak

Enthusiast II

Hi everyone - for what it’s worth, my brother (who is in the same situation) emailed Patrick Spence (Sonos CEO) and got a reply stating that LPCM will be supported and the update will be coming “this year”. So far the only other source stating this has been a post on this forum (I believe) so this might give people more confidence that the functionality is indeed lined up for the near future. I don’t think it’s a totally safe bet until they’ve shipped the update but it’s looking more positive.

This year could mean tomorrow or in six months. That’s not really promising and will be outside most people’s return period.

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batsabode

Lyricist III

totally agree!

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Poorpilot

Trending Lyricist I

LG 75NANO90UNA which I love but not loving all the complications with something that should be easy. Maybe I still. need to play around with it more. It obviously has the latest software on everything, the. LG ATC and Sonos

You arent the only one. I have the 65Nano90 and i have the same issue. Whenever atmos plays on the Apple TV 4K i get no sound. If its not atmos content, then it works fine. Currently i just have atmos shut off on the Apple TV, until we get the LPCM update. Also, i tried tech support for Sonos, Apple, and LG. Basically was a waste of an entire day

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Tylertron21

I own the LG C9 and the Arc in the 5.0.2 surround package. I am on the last firmware for the LG, 4.71.xx. I am getting multiple, daily notifications to update the TV to the new 4.80.xx firmware.

The devices I own are a 4k bluray player, Ps4 pro, and Nintendo Switch. I DO NOT own the Apple TV or Nvidia Shield. I also DO NOT use Plex or anything to play ripped movies over the network or through Hdmi. I watch movies in two ways these days, either through the Bluray player and through LG’s built in WebOs apps.

Questions are: Can I update the TV while retaining Atmos and proper surround from the bluray player? Will I lose surround from the Ps4? I have all my settings correct as is for all three devices. I get Atmos and 5.1 with not issues. The Nintendo Switch is set to stereo mode since it uses Multi channel pcm for the surround mode.

I hope I can get a clear yes or no’s. And why’s to would be great! Thanks!

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jamesgbeaumont

Contributor I

I own the LG C9 and the Arc in the 5.0.2 surround package. I am on the last firmware for the LG, 4.71.xx. I am getting multiple, daily notifications to update the TV to the new 4.80.xx firmware.

The devices I own are a 4k bluray player, Ps4 pro, and Nintendo Switch. I DO NOT own the Apple TV or Nvidia Shield. I also DO NOT use Plex or anything to play ripped movies over the network or through Hdmi. I watch movies in two ways these days, either through the Bluray player and through LG’s built in WebOs apps.

Questions are: Can I update the TV while retaining Atmos and proper surround from the bluray player? Will I lose surround from the Ps4? I have all my settings correct as is for all three devices. I get Atmos and 5.1 with not issues. The Nintendo Switch is set to stereo mode since it uses Multi channel pcm for the surround mode.

I hope I can get a clear yes or no’s. And why’s to would be great! Thanks!

I have LG C9 with latest 4.80 firmware, Arc in 5.1.2, PS4 Pro, Apple TV 4K, Samsung 4K Blu ray.

PS4Pro using bitstream (Dolby digital) works fine with surround. I haven’t noticed a lag, but it sounds like others may have. PCM does not work for surround.

Atmos works fine with Blu Ray, Apple TV and TV’s apps.

The main thing that doesn’t work is DD5.1 from Apple TV unless I change audio output to force Dolby digital, but if I do that then I don’t get Atmos.

Personally, if I could downgrade the LG firmware and wait for Sonos’ support for LPCM I would.

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Tylertron21

I own the LG C9 and the Arc in the 5.0.2 surround package. I am on the last firmware for the LG, 4.71.xx. I am getting multiple, daily notifications to update the TV to the new 4.80.xx firmware.

The devices I own are a 4k bluray player, Ps4 pro, and Nintendo Switch. I DO NOT own the Apple TV or Nvidia Shield. I also DO NOT use Plex or anything to play ripped movies over the network or through Hdmi. I watch movies in two ways these days, either through the Bluray player and through LG’s built in WebOs apps.

Questions are: Can I update the TV while retaining Atmos and proper surround from the bluray player? Will I lose surround from the Ps4? I have all my settings correct as is for all three devices. I get Atmos and 5.1 with not issues. The Nintendo Switch is set to stereo mode since it uses Multi channel pcm for the surround mode.

I hope I can get a clear yes or no’s. And why’s to would be great! Thanks!

I have LG C9 with latest 4.80 firmware, Arc in 5.1.2, PS4 Pro, Apple TV 4K, Samsung 4K Blu ray.

PS4Pro using bitstream (Dolby digital) works fine with surround. I haven’t noticed a lag, but it sounds like others may have. PCM does not work for surround.

Atmos works fine with Blu Ray, Apple TV and TV’s apps.

The main thing that doesn’t work is DD5.1 from Apple TV unless I change audio output to force Dolby digital, but if I do that then I don’t get Atmos.

Personally, if I could downgrade the LG firmware and wait for Sonos’ support for LPCM I would.

It would appear the only LG owners who shouldn’t upgrade are the ones using the ATV4k as their main content box then right? Since not owning the ATV I could upgrade the firmware and not lose anything that I am enjoying right now?

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Tylertron21

I did the new 4.80.03 update on my LG65OLEDC9. I right off the bat lost the center channel on the PS4 pro. It turns out the PS4 now recognizes the TV can decode 7.1 PCM. This issue can be addressed easily by entering the main PS4 audio settings. The moment you open the audio settings it will mention how this device can support 7.1. You need to force it to 5.1 using the checkbox on that screen. Then change the output from PCM to Dolby. Everything works great. I just go into the game settings (last of us part 2) and make sure the audio home theater is set to 5.1 in game.

I’m not sure this can be answered, but I will ask out of curiosity. When Sonos delivers the LPCM update, will the Arc be able to receive 7.1 PCM? Or will we still need to force 5.1?

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LenardH

Lyricist II

Best practices: Because you can not down grade these updates...

Never allow automatic software download on a SmartTV.
Before doing an update, research to see if there are any serious problems with the update.

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jakesilv

Contributor I

Wrestling with this issue all day on an Apple Tv4k and LG oled C9 with the new Arc.

makes no sense at all to have to turn Dolby Atmos on and off based upon what I’m watching. Why in the world would Sonos release the arc with no support for LPCM? Ughhh… pretty shocked.

To simplify the only current work around is to force the Apple TV to output Dolby digital audio, and then enable Dolby Atmos when specifically watching a Dolby Atmos enabled movie.

Seems like the Arc can only recognize 2 channel PCM and not multichannel PCM.

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