Question

Sonos Arc Issue: LG OLEDC9 & AppleTV4K

  • 2 August 2020
  • 6 replies
  • 97 views

Help needed as configured with very common equipment that will affect many existing and potential future customers.  
 

Two main problems with Sonos Arc:

  1. No Voices watching movies on Disney+ or Amazon Prime via AppleTV 4K
  2. No Dolby Atmos

Equipment:

LG OLED C9 (Updated Software  Version: 04.80.03)

AppleTV 4K

Sonos Arc


Connection (both Arc and AppleTV to the LGC9):

HDMI 1 port: AppleTV via Zeskit 8K Ultra HDMI cable (with eARC and Ethernet)

 

HDMI2 port: (ARC connection port for LGC9) Sonos Arc via same brand and model cable above 

 

LG TV set to:

HDMI ARC
→ Digital Sound Out (Pass Through) 

→ eARC (On)

 

HDMI Input Audio Format → Bitstream for all HDMI Ports

 

I spent a lot of money on the latest and greatest equipment and very surprised to see the Sonos Arc not working correctly.  One Apple thread said problem with Sonos Arc as only 1 HDMI port on the Arc.

 

Coming here for experts advice   
 

Again, the equipment I have is pretty common and will affect many existing and potential future customers.

 


6 replies

Userlevel 4
Badge +4

There are a bunch of threads on this already.  Here’s the main one with the right settings.  https://en.community.sonos.com/home-theater-228993/lpcm-eta-for-arc-6842558/index4.html

Basically you can get Atmos/DD 2.0 or DD5.1 and no Atmos depending on the settings you choose.  Meaning you have to manually switch between having Atmos and having DD 5.1.  It’s because of an LG firmware update and Sonos’s not yet supporting LPCM.  Sonos has announced support for LPCM in the future.  Right now, the solution is to use the LG built in apps or you can manually change your settings when you use the Apple TV.

I’m not sure what is causing you to hear no voices, but try the settings shown in that thread.

Thanks ewolkoff

 

I searched with no luck.  That is a good thread.  To save folks a dig and add a few more takeaways / basic comments:

 

Sonos update needed and “in development” as of 8/2/2020 to allow AppleTV4K to work in .  So in meantime no Dolby Atmos (big deal as THAT is the feature to allow home theater sounds from Sonos arc to appear to come from ceiling… why you paid the big bucks to get… otherwise just get a regular soundbar and save a lot of money)  

 

In meantime - just to hear voices in AppleTV4K (Forget the Dolby Atmos dream… just trying to get arc to work as a normal speaker) - must go to settings in AppleTV4K and force Dolby 5.1.  To do this:

 

Settings → Video and Audio → Audio Format 

 

Change Format → On 

 

From there you can set to Dolby Digital 5.1.  
 


 

 

Userlevel 4
Badge +4

Thanks ewolkoff

 

I searched with no luck.  That is a good thread.  To save folks a dig and add a few more takeaways / basic comments:

 

Sonos update needed and “in development” as of 8/2/2020 to allow AppleTV4K to work in .  So in meantime no Dolby Atmos (big deal as THAT is the feature to allow home theater sounds from Sonos arc to appear to come from ceiling… why you paid the big bucks to get… otherwise just get a regular soundbar and save a lot of money)  

 

In meantime - just to hear voices in AppleTV4K (Forget the Dolby Atmos dream… just trying to get arc to work as a normal speaker) - must go to settings in AppleTV4K and force Dolby 5.1.  To do this:

 

Settings → Video and Audio → Audio Format 

 

Change Format → On 

 

From there you can set to Dolby Digital 5.1.  
 


 

 

This information is wrong.  When set correctly AppleTV outputs Atmos to the Arc via an LG 9 series OLED. But if you set it that way, you have to change the config back to get Dolby 5.1.  Please read the other thread and see the screenshots with the AppleTV 4K outputting Atmos.  

I disagree and must be missing your point. 
 

I got that information from the other thread. 
 

It worked. 
 

You must force the AppleTV4K to do Dolby 5.1 as I described above within the AppleTV settings control (restated from the referenced thread)
 

Please elaborate on what is incorrect  

 

i will add the screenshots in the referenced thread show AUTO for the “Digital Sound Out” whereas everything I read says that should be set to “Pass Through”   I don’t think it mattered (?) in that case as user clearly shows Dolby Atmos as end result.

 

Userlevel 4
Badge +4

I disagree and must be missing your point. 
 

I got that information from the other thread. 
 

It worked. 
 

You must force the AppleTV4K to do Dolby 5.1 as I described above within the AppleTV settings control (restated from the referenced thread)
 

Please elaborate on what is incorrect  

 

i will add the screenshots in the referenced thread show AUTO for the “Digital Sound Out” whereas everything I read says that should be set to “Pass Through”   I don’t think it mattered (?) in that case as user clearly shows Dolby Atmos as end result.

 

You wrote, “So in meantime no Dolby Atmos”.  That is wrong.   The user was me -- those are my screenshots.  Atmos works - use those settings. The issue is that the TV’s auto mode isn’t working right with the latest firmware update and Sonos’s current lack of support for LPCM.  Therefore, you have to manually switch between DD 5.1 and Atmos.   I trust you also created an account on the LG forum to complain to LG too?  It is their firmware update that broke it.  It was working fine before...

I see - thank you

 

What an 8th level of Dante’s hell.  
 

It’s there once you read entire thread and all replies enough for context (for me reading entire thread twice helped as learned more on second pass after initial pass - most of this was all new to me… after that thread and many other external sources… I know more acronyms and tech info than I ever wanted or thought I needed to know).   Lot of work for a consumer just wanting a good picture with sound absent of hardcore setups.

 

Maybe pull your reply as a separate thread?  It’s helpful and only success I’ve found.  Thanks for posting it and jumping in here too.  
 

Everything on web I found keeps saying “pass through“ as the setting, particular for ARC and eARC.  You do that and no voices (at least for me on my LG C9) through AppleTV4K.   Doing “auto” on the LG end as you say fixes that.  So did the Dolby 5.1 force above on the AppleTV4K end.   Two different ways that enable voice in movies through apps on AppleTV4K  … but as you point out the AppleTV4K path leaves you no shot at Dolby Atmos for the instances you can do it through AppleTV4K.  If I understand things correctly, the optimum is just leave AppleTV4K to Atmos and the LG to Auto… now best of both worlds.  I’m back to Dante’s 8th level…  what a mess!
 

I did appreciate some of the other posts in that thread as frustration.  It is bizarre nothing works right now as advertised if you own a LG OLED C9, AppleTV4K, and Sonos Arc without unnatural work arounds that are next to impossible to find leading me to the desperation of my post for help.

 

The other useful post IMO was Sonos recognizes problem and working on update per an email from an exec to one of the posters on that thread.  
 

Seems like product may have been rolled out a little early   

 

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