Contributor I

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

127 replies
21243 views

I have the Arc, Sub, and Sonos 1 in a surround setup, connected to an LG CX via eArc. Previously I had the PS4 outputting Bitstream (Dolby), and Sonos reported Dolby Digital 5.1.

The fix that added LPCM to Sonos Arc recently went live, so I updated PS4 Pro to output PCM, and the HDMI input on the TV to PCM. (The output remained Passthrough). After doing this, the System Status page for Sonos shows Multichannel PCM 7.1.

However, I now get no rear surround audio in games like Assassin’s Creed Valhalla. (It’s not faint, there’s really none.) I get the full surround experience if I change it back to getting Dolby Digital 5.1. On the PS4 Home screen, I do get sound from the rears in PCM 7.1, albeit very faintly, compared to Dolby Digital 5.1.

Does Sonos not downmix the extra channels properly? It’s kinda bad that a higher fidelity signal sounds worse.

This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.

Show previous replies

skullc

Prodigy III

Another new Arc owner here with a 5.1 setup, and an LGC1 having this issue.

I’m kind of amazed scrolling back how long this has gone on without a fix. Somewhat disheartening.

Lgc1 does not support dts pass through

Only c9 or older does

Also the newer lg TVs have this problem with games waiting on a firmware fix

There's a video on YouTube by hdtv test detailing most of the issues in this thread

Network= livewire cpe pro 3 +eero 6 pro wireless

ohweezuschrist

Lyricist II

I am sure this has already been mentioned, but the Apple TV is also receiving the same issue with the audio being interpreted as Multichannel 7.1; just like my PS5. I did not have this issue with my Chromecast w/ Google TV.

You would think after the CEO tweeted about a fix being in the works during this past summer, that it would be here now. I have no idea what Sonos is doing.

R

rpath

Contributor I

Another new Arc owner here with a 5.1 setup, and an LGC1 having this issue.

I’m kind of amazed scrolling back how long this has gone on without a fix. Somewhat disheartening.

Lgc1 does not support dts pass through

Only c9 or older does

Also the newer lg TVs have this problem with games waiting on a firmware fix

There's a video on YouTube by hdtv test detailing most of the issues in this thread

It’s crazy to me that LG hasn’t even acknowledged this issue. My guess is, they’d rather just sonos down mix the signal and not have to do anything. Do you know which HDTV video it was where he highlighted these issues?

R

rpath

Contributor I

I’m really bummed to see that technology in 2021 continues to not play nice together. I appreciate sonos trying to solve this problem by offering downmixing but LG should be the ones to blame here imo. I just purchased the C1 and I absolutely love this TV and my arc setup but it’s disheartening seeing this issue.

@Corry P is there any update to this with regard to the feature being worked on? I understand there might not a release window yet but it’d be nice to get confirmation that this is something that is still being worked on, considering more buyers will be picking up TVs like the C1 over the holidays. Thanks.

L

ledzep1

Headliner II

Perhaps its not an issue as such, and just how the lg and sonos arc report everything in LPCM as 7.1.

I must admit when the sonos arc reports something as multichannel pcm 7.1 it sounds fine to me.

i don’t have any rears though, just the ARC and Sub here.

In any case It would be nice if someone from support could respond, as much as I love sonos, I think their communication could be a lot better.

W

Whistler

Enthusiast II

Perhaps its not an issue as such, and just how the lg and sonos arc report everything in LPCM as 7.1.

I must admit when the sonos arc reports something as multichannel pcm 7.1 it sounds fine to me.

i don’t have any rears though, just the ARC and Sub here.

In any case It would be nice if someone from support could respond, as much as I love sonos, I think their communication could be a lot better.

Well, Sonos already admitted it’s an issue. It is very noticeable when you have rear speakers. Just hope it doesn’t take as long as adding DTS support to fix this *wink*

K

kikeminchas

Lyricist III

I have a similar issue but not sure is the same? Got a Beam 2 , LG CX and nvidia shield. When playing a dolby file in Plex i get the correct codec ie: AC3 , i get Dolby Plus in the app, TrueHD, i get Atmos... Plex is set to Passthrough. However, when i play a dts file, i get this Multichannel 7.1. strange thing is that plex is not even transcoding the Audio, it's doing direct play. How is that even possible since my TV does not support dts? I hear sound from the rear speakers but I assume is wrong then?

J

jackuiowa

Lyricist III

I have a similar issue but not sure is the same? Got a Beam 2 , LG CX and nvidia shield. When playing a dolby file in Plex i get the correct codec ie: AC3 , i get Dolby Plus in the app, TrueHD, i get Atmos... Plex is set to Passthrough. However, when i play a dts file, i get this Multichannel 7.1. strange thing is that plex is not even transcoding the Audio, it's doing direct play. How is that even possible since my TV does not support dts? I hear sound from the rear speakers but I assume is wrong then?

Hey that’s what I’m wondering too…why is the shield doing that as multichannel 7.1….no idea

E

Erikto

Lyricist I

I have a similar issue. I just changed from a beam to a beam gen2. I am using an Apple TV as source with an lg cx tv. When using the earc connection and digital out passthrough on the tv I get multichannel pcm 7.1 whenever I play any dolby 5.1 on the Apple TV. Changing the digital out to auto it changes the signal to Dolby Multichannel PCM 5.1. A similar thing happens on the ps4 using pcm. I feel like the lg cx is telling source devices to send multichannel pcm 7.1 instead of multichannel pcm 5.1.

jgatie

I have a similar issue. I just changed from a beam to a beam gen2. I am using an Apple TV as source with an lg cx tv. When using the earc connection and digital out passthrough on the tv I get multichannel pcm 7.1 whenever I play any dolby 5.1 on the Apple TV. Changing the digital out to auto it changes the signal to Dolby Multichannel PCM 5.1. A similar thing happens on the ps4 using pcm. I feel like the lg cx is telling source devices to send multichannel pcm 7.1 instead of multichannel pcm 5.1.

Passthrough is exactly what it sounds like, the audio is “passed through” the TV exactly as it comes from the source. So if the source is 7.1, you get 7.1.

Show more replies

Sign up

Login to the community