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BladeRunner73
Contributor I
June 13, 2020
Question

LG B7 + Sonos Arc and Dolby Atmos

I have a LG 2017 TV with Atmos enabled for internal speakers. In Netflix shows Dolby Vision & Atmos enabled.

I have now a Beam and with the ARC connected and the same movie shows Dolby Vision & 5.1

The TV has only ARC and no eARC.

  1. Does DD+ enables the UP-firing-Ceilling speakers and will I get a sound coming from top, or the sound bar will only give 5.1 and not use the speakers designed for Atmos?
  1. What is Compressed Atmos and will it show Dolby Vision & Atmos in Netflix over the HDMI ARC to the Sonos ARC?  
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26 replies

LexGn
Lyricist III
June 10, 2020

Has anyone had any joy getting the Arc to work with this TV?

Although it clearly recognises it is connected to the TV as it asks to ensure simplink enabled no sound via the soundbar.

The TV had previously worked fine via optical with a playbar.

I’ve checked my Arc by plugging it into an old panasonic which it recognises and outputs the sound from so presumably an issue with the LG?

Hoping for some bright ideas as I really can’t afford to replace the TV!

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anujgoel83
Trending Lyricist I
June 10, 2020

This is worrying as I have the same tv which works perfectly with my beam, and I was hoping to get Atmos via dd+, tried a different cable maybe?

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LexGn
Lyricist III
June 10, 2020

Unfortunately not... Tried with another cable and still no joy... Something's happening as it says hdmi 2 now available but no sound via the soundbar 😭

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anujgoel83
Trending Lyricist I
June 13, 2020

I have a LG 2017 TV with Atmos enabled for internal speakers. In Netflix shows Dolby Vision & Atmos enabled.

I have now a Beam and with the ARC connected and the same movie shows Dolby Vision & 5.1

The TV has only ARC and no eARC.

  1. Does DD+ enables the UP-firing-Ceilling speakers and will I get a sound coming from top, or the sound bar will only give 5.1 and not use the speakers designed for Atmos?

I have the same TV and the answer is yes, it will pass through Atmos as is also shown in the Sonos App.

  1. What is Compressed Atmos and will it show Dolby Vision & Atmos in Netflix over the HDMI ARC to the Sonos ARC?  

This is simply a lossy form, likely not distinguishable from lossless on an arc, and yes Vision and Atmos show in the Netflix app, just be sure to switch the HDMI cable out with the one supplied with arc. For reference im also coming from a beam and its a big step up!

 

 

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BladeRunner73Author
Contributor I
June 14, 2020

Thank you, I will then buy it.

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Dennis from FL
Avid Contributor III
June 14, 2020

I also have a 2017 B7 LG OLED.   My Arc arrives soon, but previously my setup was a Marantz 7.1.2 with Atmos.   The Marantz display said “Atmos” when I used either Apple TV (HDMI into the receiver) or the LG Apps for Netflix or Prime with Atmos sources (using HDMI Arc).  Both of those I believe were compressed.   I also had a BluRay which output uncompressed.

 

I don’t remember the LG having “passthrough” in the past, and I suspect it came in a recent LG firmware.   But it is there now and I intend to try it.  It has been opined that the LG TV audio decoder is not up to the task and causes the delay in audio.  LG OLEDs were notorious for lip sync issues...especially with Atmos and optical.   Sometimes ARC.   LG has some information here  

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LexGn
Lyricist III
June 16, 2020

Did any of you have difficulty setting up the arc with your lg b7 TVs? No sound coming to the arc at all via the hdmi arc output. The Sonos clearly is communicating on some level as it recognises it's connected to an LG TV but no sound coming through. 

Tried multiple cables and checked my Sonos arc on an old Phillips TV where it received from HDMI arc without issue.…

At the moment I've had to resort to optical output and converter to use my Sonos arc so somewhat disappointed as might as well have stayed with my playbar set up!

Hopefully there's an easy fix I've missed?

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Dennis from FL
Avid Contributor III
June 16, 2020

Double check your tv audio settings.   Should be Arc Output and you can fiddle with Dolby Atmos… and make sure the arc is in HDMI 2 not 1.  Also use the LG source setup to tell the TV you have an arc soundbar on HDMI 2 - those icons on the bottom when you push home on the remote.  One of them is HDMI 2

There are some settings that you need to press a little down arrow and are hard to find.   Has your TV updated firmware?

 

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LexGn
Lyricist III
June 16, 2020

Yup... All set up like that and sadly still no joy... Hopefully LG will come back to me with a fix unless I've got a faulty TV... unfortunately as the playbar only had optical input never needed to check the HDMI arc worked until now!

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Dennis from FL
Avid Contributor III
June 16, 2020

There are some settings that you need to press a little down arrow and are hard to find.   Has your TV updated firmware?
 

Also… were you able to True Play tune?   And where is the Sonos volume slider?   If you change to the tv speakers Do you get sound?

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