Avid Contributor I

If you're experiencing audio delay issues, read this

551 replies
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I've been living with lip sync issues (audio behind the video) since I got my Playbar about a year ago but I finally decided to do something about it. After multiple conversations with Sonos support and the LG's support people (they kept blaming each other for the audio delay), I decided to email Sonos' CEO about the issue.

After a few hours, I got a reply back from him, CCing a team manager who was going to look into the issue. We scheduled a call and he had me send various diagnostics to him. He said that the engineering team was going to investigate and get back to me.

A week later, I got an update. He told that they are still working on the issue. He also said that only one other person had reported the same issue (I assume that means that only one other person with an LG TV). So, if you're having audio delay issues and you've tried all other troubleshooting, reach out to Sonos support and have them look into it. If it helps you might mention my reference number, which has already been escalated:

Keep in mind that my setup is pretty straight forward (LG C6 OLED TV connected directly to the Playbar via Optical, audio playing from the built-in apps) and every single thing LG and Sonos suggested, including going into the TV's service menu and changing things there.

I know there are multiple post on the topic so hopefully we can solve at least some of the issues causing audio delay.

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Ken_Griffiths

FWIW, I still see lip sync delay with pass-through enabled. I have an LG C9 and Sonos Beam connected directly to the TV via the HDMI ARC port.

I assume you are using the v04.70.05 firmware with your TV? See also the following...

I’m on v04.70.12, which is the latest in the US. I have HDMI Ultra HD Deep Color enabled since the TV connects directly to the Apple TV 4K. The TV connect via the HDMI ARC port to the Sonos Beam using the bundled HDMI cable (though I tried a Belkin Ultra High Speed HDMI cable as well). Do you have your TV outputting Bitstream or PCM? What are you AV sync settings in the Sound menu? Is the Apple TV outputting Dolby Atmos to the TV?

My TV is outputting Bitstream. DTV Audio setting is set to 'Auto', AV sync Adjustment is ‘off’.

Sonos does not support Dolby Atmos (either the DD+ or the TrueHD version) .. you need to output Dolby Digital 5.1 audio for your Apple TV.

P

ProdanAuthor

Avid Contributor I

My TV is outputting Bitstream. DTV Audio setting is set to 'Auto', AV sync Adjustment is ‘off’.

Sonos does not support Dolby Atmos (either the DD+ or the TrueHD version) .. you need to output Dolby Digital 5.1 audio for your Apple TV.

Right, but Dolby Atmos still gets to the TV. Then the TV downsamples (or fallbacks) to 5.1 which is sent to the Sonos.

Is content from the built-in apps showing as DD 5.1 on your Sonos?

Ken_Griffiths

My TV is outputting Bitstream. DTV Audio setting is set to 'Auto', AV sync Adjustment is ‘off’.

Sonos does not support Dolby Atmos (either the DD+ or the TrueHD version) .. you need to output Dolby Digital 5.1 audio for your Apple TV.

Right, but Dolby Atmos still gets to the TV. Then the TV downsamples (or fallbacks) to 5.1 which is sent to the Sonos.

Is content from the built-in apps showing as DD 5.1 on your Sonos?

Er.. Afraid not, not whilst you have the TV set to pass-through, it won’t down-mix anything at all.

P

ProdanAuthor

Avid Contributor I

Well I’m getting 5.1 sound out of the Sonos. Since Atmos is delivered not as a codec but as an extension to DD or TrueHD, I assume it gets folded into the bitstream to maintain backwards compatibility.

Ken_Griffiths

Prodan,

Sorry I missed the second part of your post...

With my HDMI set to 'Bitstream' & ‘Pass-Through’ (eARC is switched off) and all my HDMI connected devices set to Dolby Digital 5.1, the 'About my System’ audio in the Sonos App for the connected Beam says Dolby Digital 5.1, that’s whether I play the DD 5.1 movie source (eg. Netflix Movie) from my V6 box, my Apple TV or from the TV’s built-in Apps.

Ken_Griffiths

Well I’m getting 5.1 sound out of the Sonos. Since Atmos is delivered not as a codec but as an extension to DD or TrueHD, I assume it gets folded into the bitstream to maintain backwards compatibility.

That’s really very strange?? ....I don’t see how the LG TV can do anything with the audio stream from your Apple TV when the ports have been set to ‘pass-through’. The setting should be doing 'what it says on the tin’ ..letting the audio pass through, as if the Apple TV was connected direct to your Beam? ...Maybe that’s where your lip-sync problem lies??

J

josserman

Contributor I

Bought a beam/sub and LG C9, now starting to regret it. TV hasn’t arrived but hooked up to older plasma last night along with 2 play 1 rears bring repurposed. Even going optical to hdmi I was getting some out of sync audio. Played with Sonos adjuster which helped as well as processing on older tv, but couldn’t get it perfect.

Seriously tempted to send the Sonos back despite how convenient it is. I saw a nice slim marantz receiver and high end 5.1 speaker combo online for a great price about what I paid for the beam and sub.

Seems other tv’s have this issue, but if this is isolated to LG then I’ll add it to the list of complaints. Spent month trying to deal with LG resolution issues with MacBook (but this could also be an Apple issue and not LG).

Ken_Griffiths

Bought a beam/sub and LG C9, now starting to regret it. TV hasn’t arrived but hooked up to older plasma last night along with 2 play 1 rears bring repurposed. Even going optical to hdmi I was getting some out of sync audio. Played with Sonos adjuster which helped as well as processing on older tv, but couldn’t get it perfect.

If you played with the Sonos ‘Adjuster' and that ‘helped’ to make a difference, then that really does sound like you had your speakers ‘grouped’ rather than them set them up within a bonded setup, as the TV dialog adjuster would not have helped at all with lip-sync, in fact it would have made it far worse???

B

bjermyn

Lyricist I

Hi: As far as I know I have updated the most recent TV Firmware. This is in Ontario, Canada. I am just viewing cable TV channels with Rogers Cable. I am not certain of other settings. I am not too keen on adding other GIZMOS. It was a simple setting to fix that would be great, but not that huge of an issue. May just have to live with it. It sadly seems that as technology gets more and more sophisticated (read complex) it becomes more and more problematic. How did we get a man on the moon? I tried my TV on just internal speakers and I believe there is still a lip sync issue. Even have access to several LG TVs in this building and all seem similar. I can’t even rule out that it is also not affecting an old Panasonic LCD. Maybe it is an Internet Cable Provider. I would like to see a digital meter that would align the audio and video? Perhaps for Christmas? lol.

Ken_Griffiths

Hi: As far as I know I have updated the most recent TV Firmware. This is in Ontario, Canada. I am just viewing cable TV channels with Rogers Cable. I am not certain of other settings. I am not too keen on adding other GIZMOS. It was a simple setting to fix that would be great, but not that huge of an issue. May just have to live with it. It sadly seems that as technology gets more and more sophisticated (read complex) it becomes more and more problematic. How did we get a man on the moon? I tried my TV on just internal speakers and I believe there is still a lip sync issue. Even have access to several LG TVs in this building and all seem similar. I can’t even rule out that it is also not affecting an old Panasonic LCD. Maybe it is an Internet Cable Provider. I would like to see a digital meter that would align the audio and video? Perhaps for Christmas? lol.

The Sonos devices are just speakers and so they can only play the audio when it is actually delivered to them in the correct format they support (PCM or Dolby Digital upto and including DD5.1 surround sound), so the fact you are using a Cable TV box, then it makes sense to set the audio output on that device to Dolby Digital 5.1 and then set the TV HDMI-ARC (or the TV’s optical port depending on the connection being used) to pass-through that audio stream without processing/interrupting it. The C9 certainly allows that ...and it definitely works for me with my cable box and Apple TV etc. attached to its HDMI ports.

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