Trending Lyricist I

LG C9 and Sonos Arc

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Hey all, my Arc was delivered this morning and I've had a chance to hook it up to my LG C9 directly via eARC and ran a few tests regarding Atmos and other features.

Built in apps:

Netflix - Reporting Dolby Atmos (DD+) for Atmos content.
Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU)
Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.

Xbox One:

HDMI Audio set to Bitstream out and Bistream Format set to Dolby Atmos has no delay, finally! Displays Dolby Atmos in Sonos app.

PS4:

Like with the Xbox, there's no delay on Bitstream HDMI audio

NVidia Shield Pro:

Netflix - Reporting Dolby Atmos (DD+) for Atmos content.
Amazon Prime - Reporting Dolby Atmos (DD+) for Atmos content.
Disney+ - Reporting Dolby Digital Plus 5.1 (though this is likely due to the current throttling taking place in the EU). After connecting up to a US VPN it's reporting Dolby Atmos (DD+) for Atmos content.
PLEX - This is where it gets slightly annoying. Playing TrueHD content it reports Stereo 2.0. Setting Passthrough to HDMI reports Dolby Atmos (TrueHD). For DTS content you need to switch the Passthrough setting to Optical which in turn causes TrueHD to playback in Dolby Digital Plus 5.1.

Apple TV:

iTunes Content - Reports Dolby Atmos for Atmos content. Non Atmos content reports Stereo 2.0. With Change Format > On and New Format > Dolby Digital 5.1, I receive Dolby Digital 5.1 from non-Atmos iTunes content. I ran this test using Beetlejuice and Avengers Assemble.
Netflix - Reports Dolby Atmos for Atmos content.
Amazon Prime - Reports Dolby Atmos for Atmos content.
Disney+ - Reporting Stereo 2.0 for all content bizarrely. Setting audio output on the Apple TV to Dolby 5.1 allows all content to playback in 5.1 rather than stereo.

My C9 is running firmware 04.80.03 with the following settings:

Sound Out

HDMI ARC selected

Digital Sound Out set to Passthrough

eARC set to ON

Additional Settings

DTV Audio Setting set to Auto

HDMI Input Audio Format set to Bitstream.

If there's anything else I can test or any questions, let me know!

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M

Mugiwara

Lyricist I

Hi all,

I just purchased lg oled bx series with Arc, and i connect it with my sony ubp- x800. The problem is can't playing dolby atmos. Atmos work perfectly fine on netflix.

Any suggestions guys.

Thanks

david82

Collaborator II

Hi,

Can you possibly share a pic of how your Arc looks in front of the C9? I want to get one but am conscious of the fact it will sit pretty high compared to the low-profile C9 stand… does it look odd at all?

It definitely cuts off a couple of inches on my 65C9. I bought a riser off of AmazonUK but I’ve seen a few people buy Ikea Lack shelves which is a pretty cheap way of doing it.

As I feared… I have no idea why LG made the stand so low-profile when a great many of the people buying OLEDs are going to be pairing them with sound-bars!

Would you mind sharing a link to the riser you purchased?

i picked up one of these PERLESMITH Universal TV Stand for my 55C9 - it has adjustable height and easy assembly. they have a larger version for 65” and an even beefier version for up to 70” TVs.

D

dP89

Lyricist III

Hi,

Can you possibly share a pic of how your Arc looks in front of the C9? I want to get one but am conscious of the fact it will sit pretty high compared to the low-profile C9 stand… does it look odd at all?

It definitely cuts off a couple of inches on my 65C9. I bought a riser off of AmazonUK but I’ve seen a few people buy Ikea Lack shelves which is a pretty cheap way of doing it.

As I feared… I have no idea why LG made the stand so low-profile when a great many of the people buying OLEDs are going to be pairing them with sound-bars!

Would you mind sharing a link to the riser you purchased?

i picked up one of these PERLESMITH Universal TV Stand for my 55C9 - it has adjustable height and easy assembly. they have a larger version for 65” and an even beefier version for up to 70” TVs.

Could you share a picture how this looks like?

From different viewpoints if possible.

thank you

G

gerdon

Lyricist I

Hi,

How can you tell if the ARC is playing dolby true hd , as I presume there will be no dolby Atmos badge in the sonos app?

My setup for shield is

ARC sound bar eARC slot to eARC slot HDMI 2 on C9, with shield connected to HDMI 1 on the C9

For shield plex app, pass through and available audio formats set too Auto

david82

Collaborator II

i picked up one of these PERLESMITH Universal TV Stand for my 55C9 - it has adjustable height and easy assembly. they have a larger version for 65” and an even beefier version for up to 70” TVs.

Could you share a picture how this looks like?

From different viewpoints if possible.

sure thing!

V

Vyktym

Lyricist I

Hi guys, new Sonos owner here and I’m having trouble getting Atmos to work consistently. My ARC + Sub is hooked up to my 2019 LG C9, but I’m not experiencing the same level of success reported by many others. I can’t seem to find the root cause, so I was hoping for guidance/help.

Here are my results:

Settings: HDMI ARC selected, eARC enabled, and I’ve tried both Passthrough & Auto; firmware: 4.71.25 (before LPCM update I believe). Also, I did try cycling eARC and passthrough off and then on as suggested earlier.

Internal Apps:

Dolby Access: reports Dolby Atmos!
Plex: reports Dolby Atmos!
Netflix (used 6 Underground but I don’t subscribe to UHD tier): reports DD+ 5.1
Prime (used s1:e1 of Jack Ryan): reports DD+ 5.1

Apple TV 4K:

Plex: reports DD 5.1 (no Atmos)
Netflix: DD 5.1
Prime: DD 5.1

Nvidia Shield (2017):

Plex: reports Dolby Atmos!
Netflix: DD+ 5.1
Prime: DD+ 5.1

Am I missing something? Netflix may be a subscription issue, but I have no idea why Plex isn’t working on the ATV (since it’s working fine via the shield and internal app). I also don’t have an answer for Prime Video since there aren’t additional streaming tiers. Any thoughts would be greatly appreciated!! I’d also be happy to start a new post if that’s a better option.

david82

Collaborator II

@Vyktym, it looks like you're mostly all set. until you subscribe to the UHD tier for netflix you also won't see Atmos. for Prime, try s1, episode 2 of jack ryan. for some reason episode 1 is not in Atmos.

i don't have an ATV4K so not sure of specifics there but everything else appears to be working.

M

midimo123

Lyricist I

That seems to be tricky.

I have done a lot of tests with my brandnew LG 9C (updated), an Apple TV4, Fire Cube, SKY Q.

I think there is a handshake problem and a problem with the Apple TV4/MAT.

Short Version:

First everything seems to be ok and Atmos worked, Then no Atmos at all. After rebooting everything, Atmos with Netflix worked (TV app, ATV App), amazon and SkyQ also (settings as described at the beginning of this thread),

Apple TV4/Apple TV+ content (See) is also working with Atmos.

But itunes content (1917j worked only for a few minutes, after switching between bitstream and pcm. Then I got only a horrible sound with the German format. English format worked a short time, then only Stereo 2.0 but loud and clear. so I had to switch to Dolby 5.1 in the Apple menu to hear a normal sound (German format),

I don’t understand the difference between Apple TV+ and itunes movie content.

I think there is more than one problem...

D

dP89

Lyricist III

C9 / Apple TV / Arc

Atmos working on Netflix, but all other 5.1 just shows as stereo 2.0 on Sonos app.

ATV change format off, atmos on

C9 eARC enabled. Digital sound out is Auto.

if I set sound out to pass through I get what appears to be two non speech channels passed to Sonos. Very odd.

The two channel non-speech is what would happen if a multichannel L-PCM signal is sent to Arc. Only the left and right channels are being played, since only stereo PCM is supported right now. The team just started looking into adding L-PCM to Arc for the future, based on community request, but we haven’t released a timeline for that yet.

You’ll want to have your source outputting Dolby Digital or PCM Stereo to avoid missing things like dialogue.

I have a similar setup C9 / Apple TV/ Arc

Unfortunately, I updated to the latest Firware Version (04.08.xx) and now everything is kind of screwed up. Now I’m playing around with settings and trying to fix it.

There are so many options which are solving the issue of getting back the speech channels, however the Sonos app is always showing Stereo 2.0.

What is the right setting on my LG c9, not to only get the speech channels back but also proper audioinput how it was before??

In the HDMI ARC Options:

-Do I disable eArc

-Or do I set “Digital sound out” to PCM instead of pass trough

Another option would be to set HDMI Input Audio Format from Bitsteam to PCM

As metioned I want to have it properly fixed, and not just the speech channels back.

Can anyone help here? For now I will continue to use LGs inbuilt apps.

@Ryan S : I would really appreciate if this L-PCM feature will be implemented in a timely manner. I’m really thinking about returning the ARC back and buying it again when it’s not in this “beta” stage anymore. I expect more from a 900 Euro Soundbar.

Not to mention the “Bass” issue that is reported in another thread.

david82

Collaborator II

C9 / Apple TV / Arc

Atmos working on Netflix, but all other 5.1 just shows as stereo 2.0 on Sonos app.

ATV change format off, atmos on

C9 eARC enabled. Digital sound out is Auto.

if I set sound out to pass through I get what appears to be two non speech channels passed to Sonos. Very odd.

The two channel non-speech is what would happen if a multichannel L-PCM signal is sent to Arc. Only the left and right channels are being played, since only stereo PCM is supported right now. The team just started looking into adding L-PCM to Arc for the future, based on community request, but we haven’t released a timeline for that yet.

You’ll want to have your source outputting Dolby Digital or PCM Stereo to avoid missing things like dialogue.

I have a similar setup C9 / Apple TV/ Arc

Unfortunately, I updated to the latest Firware Version (04.08.xx) and now everything is kind of screwed up. Now I’m playing around with settings and trying to fix it.

There are so many options which are solving the issue of getting back the speech channels, however the Sonos app is always showing Stereo 2.0.

What is the right setting on my LG c9, not to only get the speech channels back but also proper audioinput how it was before??

this would seem to be a question to ask LG since its their firmware that introduce this regression in behavior. they might just have you downgrade firmware.

In the HDMI ARC Options:

-Do I disable eArc

eARC will be needed in general unless LG thinks it will resolve the new firmware bug.

-Or do I set “Digital sound out” to PCM instead of pass trough

Another option would be to set HDMI Input Audio Format from Bitsteam to PCM

As metioned I want to have it properly fixed, and not just the speech channels back.

Can anyone help here? For now I will continue to use LGs inbuilt apps.

since the Arc won’t understand any multichannel PCM above stereo i’d suggest setting it to Bitstream on the inputs and Auto or Pass Through for the Digital Sound Out. if those settings don’t work for the ATV4K, it really is something LG will need to fix in the short term since the Sonos hasn’t announced any timeline (and probably won’t) on the LPCM feature.

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