If you're experiencing audio delay issues, read this


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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.


523 replies

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.

Incredible to me that 3 YEARS LATER this is still an issue. What’s the deal, Sonos?!

My situation… I have an LG 55C7P OLED TV. I have three peripheral devices connected to it via the C7’s HDMI inputs -- a DirecTV box, 4K AppleTV and a 4K Blu-Ray player. 

My Sonos Arc Soundbar (along with Sonos Subwoofer and two Sonos Ones as rears) is connected using the HDMI-ARC port on my TV. I continue to have major audio sync issues with all three peripheral devices when they’re playing content with Dolby Digital or Dolby Atmos audio. There are no sync issues when I use the LG TV’s internal apps. The only way I can get rid of the sync issues is by switching the peripheral devices to PCM, but that, of course, defeats the purpose of having this INCREDIBLY EXPENSIVE SOUND SYSTEM I BOUGHT THAT DOESN’T WORK WITH A TOP LINE TV!

I may try the HD Fury Arcana, although they tell me I need to also purchase one of their 4K HDMI switchers, which isn’t an ideal solution because, 1) it means I can’t adjust the video for each device since they’ll all be going into the same input on the TV, and 2) between the Arcana and the HDMI switcher we’re talking another $600!!!

So, two questions for SONOS, or for anyone here who might be able to help me solve this.

  1. Is Sonos planning on FINALLY, at long last, providing some sort of firmware update to the Sonos Arc soundbar (and their other soundbars) to fix this audio sync issue? I’m assuming the answer is no, but hey, I’d love to be wrong.
  2. Short of that, I’m considering upgrading my TV to a 65”. What TV’s, preferably an OLED type, work best with the Sonos sound system. I.E., they have ZERO audio sync issues? Can Sonos provide a LIST of TV’s that work best with the Arc Soundbar? Or, how about a list of TV’s that DON’T work with the Arc Soundbar? That feels like a reasonable request. (A Sonos rep I spoke to told me, on the sly, that the new Samsungs do not have issues. But then I read about all kinds of Samsungs that do. Has that changed?)

Thanks so much in advance for any help and thoughts on what I should do next. -- Ian

Believe it or not, this is actually an hdmi ARC protocol issue. The ARC standard does not mandate lip syncing and thus is not widely supported, or if it is, it's implemented differently among manufacturers. When you want to pass surround sound via Hdmi ARC, it must be done via bitstream (compressed audio such as 5.1 dolby digital) since arc does not support pcm uncompressed 5.1 (it is sent as two-channel stereo instead due to arc bandwidth limitations and other reasons I may be unaware of).

 

So if you want any audio delay issues to be 99% of the time fixed while utilizing Hdmi ARC / passthrough, you must send it as PCM two-channel audio. This is the downside of Hdmi ARC...it can introduce audio delays since when your TV has processed both the video and audio, it sends the compressed dolby digital or dts (both bitstream) to the audio receiver / sound bar and does not know how long that receiver or Soundbar will take to process that audio. Therefore, it is not uncommon for the audio to actually come after the video.

Unfortunately, most TVs are not able to delay the video to sync up with the delayed audio except for some very modern tvs (I believe samsung has a couple models that do this... They can delay both audio or video...so an audio delay and negative delay to match the video coming before the audio).

I am not sure why all TVs are able to delay audio but not the video since HDMI ARC has this common issue and nobody wants to output PCM uncompressed audio to their Soundbar receiver as it can only be passed through as two channel audio. It solves the issue of audio delay since the TV knows when it has processed each of the video and audio and can send both out at the same time and the receiver or sound bar simply has to then play the audio, rather than decompressing it from Dolby digital to output to its speakers as the directly playable pcm. 

To add to my earlier comment here and a mini guide on audio formats that is easier to understand (hopefully) than browsing websites and various forums to save people days on end:

 

1. eARC solves these issues. Lip syncing / AV sync is mandated for this standard.

 

2. If you did somehow have delay issues (unlikely), even with this mandated lip syncing support among all eARC devices, you could correct this by sending PCM on as uncompressed 5.1 or 7.1 audio over the eARC standard as it has higher bandwidth and can support all uncompressed audio formats and even lossless formats such as True HD decompressed and sent as PCM afaik. 

 

So basically, eARC will allow all of us to send whatever kind of audio we want and still maintain our source channels, whether it be 5.1, 7.1, etc, due to higher standards and bandwidth. I am unknowledgeable on this however as it relates to higher channel inputs/outputs above 7 channel though. No longer will it matter what settings we want to use as the input/output (with my exception above regarding my lack of knowledgeable above 7 channel) as on the other side it should always work in theory. 

 

For people who aren't able to follow due to having a hard time understanding this...as it currently stands:

 

PCM means you are taking your compressed Dolby Digital or DTS format and decompressing it ("larger size" now) to send over a cable (HDMI ARC or optical) to your output device (sound bar, audio receiver, surround, etc.) at that larger size of data. Since the TV is processing both the video and audio, it knows how to time both of these and audio sync delays delays are not likely.

Bitstream means you are simply sending your compressed Dolby Digital or DTS format and sending it through to your output device (sound bar, audio receiver, surround, etc.) over HDMI ARC or optical. This supports more outputs and formats without 5.1 being converted to 2.1 since more cables can handle data that is compressed / "a smaller size". It is the surround receiver / sound bar that then converts this compressed audio, which is why we may have an audio delay on our tvs since the TV does not know how long this other device will take to process the audio (unless that device shares how long it is taking to process the audio, as is mandated by the eARC protocol).

 

Optical and ARC:

- Supports stereo

- Supports "compressed"  dolby digital 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- Supports "compressed" dolby digital plus and DTS 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- If you have a dolby digital or DTS 5.1 source and you choose to output as PCM over optical or ARC, it will output as stereo since the cable / standard doesn't support a PCM (i.e. uncompressed) signal due to bandwidth and limitations of the standard) - this PCM option however will resolve lip sync issues since the TV is sending the audio to the surround receiver/sound bar all "ready to go and play" as it's already been processed by the TV and that surround receiver / sound bar simply has to play the signal (assuming you haven't used any crazy effects that add on to that output) without doing anything to it. 

 

eARC:

- Supports pretty much everything necessary today

 

Just don't get confused with compressed and uncompressed with lossy and lossless. Two different things. Compressed audio is simply like a zip file on a computer. All of the data is still in that folder, just a smaller compressed size. The zip file would be like a dolby digital or dts format. Uncompressed audio would be one of those zip files (dolby digital or dts) being extracted into their actual audio files (PCM), which are actually directly usable by the computer or in this case, the audio output device, whether it be a sound bar or surround receiver. Lossy audio files (dolby digital, dolby digital plus, dts) are like jpg images. Lossless audio files are like Tiff, raw, dng, png images (Dolby True HD, DTS-HD). An exception is Dolby Atmos, which is more of a channel type / extension that allows for height and spatial sound that doesn't rely on traditional channels.

 

Hope this helps all novices since it took me awhile to grasp everything!

So eARC would solve my lip sync issues? I would consider returning my Philips TV for a model with eARC if it solves my issues.

That's the idea of mandatory lip sync correction in eARC so it SHOULD, but I have not used it yet and technology is never perfect. Maybe others will chime in or you can find some videos about it. 

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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.

Incredible to me that 3 YEARS LATER this is still an issue. What’s the deal, Sonos?!

My situation… I have an LG 55C7P OLED TV. I have three peripheral devices connected to it via the C7’s HDMI inputs -- a DirecTV box, 4K AppleTV and a 4K Blu-Ray player. 

My Sonos Arc Soundbar (along with Sonos Subwoofer and two Sonos Ones as rears) is connected using the HDMI-ARC port on my TV. I continue to have major audio sync issues with all three peripheral devices when they’re playing content with Dolby Digital or Dolby Atmos audio. There are no sync issues when I use the LG TV’s internal apps. The only way I can get rid of the sync issues is by switching the peripheral devices to PCM, but that, of course, defeats the purpose of having this INCREDIBLY EXPENSIVE SOUND SYSTEM I BOUGHT THAT DOESN’T WORK WITH A TOP LINE TV!

I may try the HD Fury Arcana, although they tell me I need to also purchase one of their 4K HDMI switchers, which isn’t an ideal solution because, 1) it means I can’t adjust the video for each device since they’ll all be going into the same input on the TV, and 2) between the Arcana and the HDMI switcher we’re talking another $600!!!

So, two questions for SONOS, or for anyone here who might be able to help me solve this.

  1. Is Sonos planning on FINALLY, at long last, providing some sort of firmware update to the Sonos Arc soundbar (and their other soundbars) to fix this audio sync issue? I’m assuming the answer is no, but hey, I’d love to be wrong.
  2. Short of that, I’m considering upgrading my TV to a 65”. What TV’s, preferably an OLED type, work best with the Sonos sound system. I.E., they have ZERO audio sync issues? Can Sonos provide a LIST of TV’s that work best with the Arc Soundbar? Or, how about a list of TV’s that DON’T work with the Arc Soundbar? That feels like a reasonable request. (A Sonos rep I spoke to told me, on the sly, that the new Samsungs do not have issues. But then I read about all kinds of Samsungs that do. Has that changed?)

Thanks so much in advance for any help and thoughts on what I should do next. -- Ian

Believe it or not, this is actually an hdmi ARC protocol issue. The ARC standard does not mandate lip syncing and thus is not widely supported, or if it is, it's implemented differently among manufacturers. When you want to pass surround sound via Hdmi ARC, it must be done via bitstream (compressed audio such as 5.1 dolby digital) since arc does not support pcm uncompressed 5.1 (it is sent as two-channel stereo instead due to arc bandwidth limitations and other reasons I may be unaware of).

 

So if you want any audio delay issues to be 99% of the time fixed while utilizing Hdmi ARC / passthrough, you must send it as PCM two-channel audio. This is the downside of Hdmi ARC...it can introduce audio delays since when your TV has processed both the video and audio, it sends the compressed dolby digital or dts (both bitstream) to the audio receiver / sound bar and does not know how long that receiver or Soundbar will take to process that audio. Therefore, it is not uncommon for the audio to actually come after the video.

Unfortunately, most TVs are not able to delay the video to sync up with the delayed audio except for some very modern tvs (I believe samsung has a couple models that do this... They can delay both audio or video...so an audio delay and negative delay to match the video coming before the audio).

I am not sure why all TVs are able to delay audio but not the video since HDMI ARC has this common issue and nobody wants to output PCM uncompressed audio to their Soundbar receiver as it can only be passed through as two channel audio. It solves the issue of audio delay since the TV knows when it has processed each of the video and audio and can send both out at the same time and the receiver or sound bar simply has to then play the audio, rather than decompressing it from Dolby digital to output to its speakers as the directly playable pcm. 

To add to my earlier comment here and a mini guide on audio formats that is easier to understand (hopefully) than browsing websites and various forums to save people days on end:

 

1. eARC solves these issues. Lip syncing / AV sync is mandated for this standard.

 

2. If you did somehow have delay issues (unlikely), even with this mandated lip syncing support among all eARC devices, you could correct this by sending PCM on as uncompressed 5.1 or 7.1 audio over the eARC standard as it has higher bandwidth and can support all uncompressed audio formats and even lossless formats such as True HD decompressed and sent as PCM afaik. 

 

So basically, eARC will allow all of us to send whatever kind of audio we want and still maintain our source channels, whether it be 5.1, 7.1, etc, due to higher standards and bandwidth. I am unknowledgeable on this however as it relates to higher channel inputs/outputs above 7 channel though. No longer will it matter what settings we want to use as the input/output (with my exception above regarding my lack of knowledgeable above 7 channel) as on the other side it should always work in theory. 

 

For people who aren't able to follow due to having a hard time understanding this...as it currently stands:

 

PCM means you are taking your compressed Dolby Digital or DTS format and decompressing it ("larger size" now) to send over a cable (HDMI ARC or optical) to your output device (sound bar, audio receiver, surround, etc.) at that larger size of data. Since the TV is processing both the video and audio, it knows how to time both of these and audio sync delays delays are not likely.

Bitstream means you are simply sending your compressed Dolby Digital or DTS format and sending it through to your output device (sound bar, audio receiver, surround, etc.) over HDMI ARC or optical. This supports more outputs and formats without 5.1 being converted to 2.1 since more cables can handle data that is compressed / "a smaller size". It is the surround receiver / sound bar that then converts this compressed audio, which is why we may have an audio delay on our tvs since the TV does not know how long this other device will take to process the audio (unless that device shares how long it is taking to process the audio, as is mandated by the eARC protocol).

 

Optical and ARC:

- Supports stereo

- Supports "compressed"  dolby digital 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- Supports "compressed" dolby digital plus and DTS 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- If you have a dolby digital or DTS 5.1 source and you choose to output as PCM over optical or ARC, it will output as stereo since the cable / standard doesn't support a PCM (i.e. uncompressed) signal due to bandwidth and limitations of the standard) - this PCM option however will resolve lip sync issues since the TV is sending the audio to the surround receiver/sound bar all "ready to go and play" as it's already been processed by the TV and that surround receiver / sound bar simply has to play the signal (assuming you haven't used any crazy effects that add on to that output) without doing anything to it. 

 

eARC:

- Supports pretty much everything necessary today

 

Just don't get confused with compressed and uncompressed with lossy and lossless. Two different things. Compressed audio is simply like a zip file on a computer. All of the data is still in that folder, just a smaller compressed size. The zip file would be like a dolby digital or dts format. Uncompressed audio would be one of those zip files (dolby digital or dts) being extracted into their actual audio files (PCM), which are actually directly usable by the computer or in this case, the audio output device, whether it be a sound bar or surround receiver. Lossy audio files (dolby digital, dolby digital plus, dts) are like jpg images. Lossless audio files are like Tiff, raw, dng, png images (Dolby True HD, DTS-HD). An exception is Dolby Atmos, which is more of a channel type / extension that allows for height and spatial sound that doesn't rely on traditional channels.

 

Hope this helps all novices since it took me awhile to grasp everything!

So eARC would solve my lip sync issues? I would consider returning my Philips TV for a model with eARC if it solves my issues.

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.

Incredible to me that 3 YEARS LATER this is still an issue. What’s the deal, Sonos?!

My situation… I have an LG 55C7P OLED TV. I have three peripheral devices connected to it via the C7’s HDMI inputs -- a DirecTV box, 4K AppleTV and a 4K Blu-Ray player. 

My Sonos Arc Soundbar (along with Sonos Subwoofer and two Sonos Ones as rears) is connected using the HDMI-ARC port on my TV. I continue to have major audio sync issues with all three peripheral devices when they’re playing content with Dolby Digital or Dolby Atmos audio. There are no sync issues when I use the LG TV’s internal apps. The only way I can get rid of the sync issues is by switching the peripheral devices to PCM, but that, of course, defeats the purpose of having this INCREDIBLY EXPENSIVE SOUND SYSTEM I BOUGHT THAT DOESN’T WORK WITH A TOP LINE TV!

I may try the HD Fury Arcana, although they tell me I need to also purchase one of their 4K HDMI switchers, which isn’t an ideal solution because, 1) it means I can’t adjust the video for each device since they’ll all be going into the same input on the TV, and 2) between the Arcana and the HDMI switcher we’re talking another $600!!!

So, two questions for SONOS, or for anyone here who might be able to help me solve this.

  1. Is Sonos planning on FINALLY, at long last, providing some sort of firmware update to the Sonos Arc soundbar (and their other soundbars) to fix this audio sync issue? I’m assuming the answer is no, but hey, I’d love to be wrong.
  2. Short of that, I’m considering upgrading my TV to a 65”. What TV’s, preferably an OLED type, work best with the Sonos sound system. I.E., they have ZERO audio sync issues? Can Sonos provide a LIST of TV’s that work best with the Arc Soundbar? Or, how about a list of TV’s that DON’T work with the Arc Soundbar? That feels like a reasonable request. (A Sonos rep I spoke to told me, on the sly, that the new Samsungs do not have issues. But then I read about all kinds of Samsungs that do. Has that changed?)

Thanks so much in advance for any help and thoughts on what I should do next. -- Ian

Believe it or not, this is actually an hdmi ARC protocol issue. The ARC standard does not mandate lip syncing and thus is not widely supported, or if it is, it's implemented differently among manufacturers. When you want to pass surround sound via Hdmi ARC, it must be done via bitstream (compressed audio such as 5.1 dolby digital) since arc does not support pcm uncompressed 5.1 (it is sent as two-channel stereo instead due to arc bandwidth limitations and other reasons I may be unaware of).

 

So if you want any audio delay issues to be 99% of the time fixed while utilizing Hdmi ARC / passthrough, you must send it as PCM two-channel audio. This is the downside of Hdmi ARC...it can introduce audio delays since when your TV has processed both the video and audio, it sends the compressed dolby digital or dts (both bitstream) to the audio receiver / sound bar and does not know how long that receiver or Soundbar will take to process that audio. Therefore, it is not uncommon for the audio to actually come after the video.

Unfortunately, most TVs are not able to delay the video to sync up with the delayed audio except for some very modern tvs (I believe samsung has a couple models that do this... They can delay both audio or video...so an audio delay and negative delay to match the video coming before the audio).

I am not sure why all TVs are able to delay audio but not the video since HDMI ARC has this common issue and nobody wants to output PCM uncompressed audio to their Soundbar receiver as it can only be passed through as two channel audio. It solves the issue of audio delay since the TV knows when it has processed each of the video and audio and can send both out at the same time and the receiver or sound bar simply has to then play the audio, rather than decompressing it from Dolby digital to output to its speakers as the directly playable pcm. 

To add to my earlier comment here and a mini guide on audio formats that is easier to understand (hopefully) than browsing websites and various forums to save people days on end:

 

1. eARC solves these issues. Lip syncing / AV sync is mandated for this standard.

 

2. If you did somehow have delay issues (unlikely), even with this mandated lip syncing support among all eARC devices, you could correct this by sending PCM on as uncompressed 5.1 or 7.1 audio over the eARC standard as it has higher bandwidth and can support all uncompressed audio formats and even lossless formats such as True HD decompressed and sent as PCM afaik. 

 

So basically, eARC will allow all of us to send whatever kind of audio we want and still maintain our source channels, whether it be 5.1, 7.1, etc, due to higher standards and bandwidth. I am unknowledgeable on this however as it relates to higher channel inputs/outputs above 7 channel though. No longer will it matter what settings we want to use as the input/output (with my exception above regarding my lack of knowledgeable above 7 channel) as on the other side it should always work in theory. 

 

For people who aren't able to follow due to having a hard time understanding this...as it currently stands:

 

PCM means you are taking your compressed Dolby Digital or DTS format and decompressing it ("larger size" now) to send over a cable (HDMI ARC or optical) to your output device (sound bar, audio receiver, surround, etc.) at that larger size of data. Since the TV is processing both the video and audio, it knows how to time both of these and audio sync delays delays are not likely.

Bitstream means you are simply sending your compressed Dolby Digital or DTS format and sending it through to your output device (sound bar, audio receiver, surround, etc.) over HDMI ARC or optical. This supports more outputs and formats without 5.1 being converted to 2.1 since more cables can handle data that is compressed / "a smaller size". It is the surround receiver / sound bar that then converts this compressed audio, which is why we may have an audio delay on our tvs since the TV does not know how long this other device will take to process the audio (unless that device shares how long it is taking to process the audio, as is mandated by the eARC protocol).

 

Optical and ARC:

- Supports stereo

- Supports "compressed"  dolby digital 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- Supports "compressed" dolby digital plus and DTS 5.1 (aka bitstream option - i.e. sending the compressed signal as is)

- If you have a dolby digital or DTS 5.1 source and you choose to output as PCM over optical or ARC, it will output as stereo since the cable / standard doesn't support a PCM (i.e. uncompressed) signal due to bandwidth and limitations of the standard) - this PCM option however will resolve lip sync issues since the TV is sending the audio to the surround receiver/sound bar all "ready to go and play" as it's already been processed by the TV and that surround receiver / sound bar simply has to play the signal (assuming you haven't used any crazy effects that add on to that output) without doing anything to it. 

 

eARC:

- Supports pretty much everything necessary today

 

Just don't get confused with compressed and uncompressed with lossy and lossless. Two different things. Compressed audio is simply like a zip file on a computer. All of the data is still in that folder, just a smaller compressed size. The zip file would be like a dolby digital or dts format. Uncompressed audio would be one of those zip files (dolby digital or dts) being extracted into their actual audio files (PCM), which are actually directly usable by the computer or in this case, the audio output device, whether it be a sound bar or surround receiver. Lossy audio files (dolby digital, dolby digital plus, dts) are like jpg images. Lossless audio files are like Tiff, raw, dng, png images (Dolby True HD, DTS-HD). An exception is Dolby Atmos, which is more of a channel type / extension that allows for height and spatial sound that doesn't rely on traditional channels.

 

Hope this helps all novices since it took me awhile to grasp everything!

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.

Incredible to me that 3 YEARS LATER this is still an issue. What’s the deal, Sonos?!

My situation… I have an LG 55C7P OLED TV. I have three peripheral devices connected to it via the C7’s HDMI inputs -- a DirecTV box, 4K AppleTV and a 4K Blu-Ray player. 

My Sonos Arc Soundbar (along with Sonos Subwoofer and two Sonos Ones as rears) is connected using the HDMI-ARC port on my TV. I continue to have major audio sync issues with all three peripheral devices when they’re playing content with Dolby Digital or Dolby Atmos audio. There are no sync issues when I use the LG TV’s internal apps. The only way I can get rid of the sync issues is by switching the peripheral devices to PCM, but that, of course, defeats the purpose of having this INCREDIBLY EXPENSIVE SOUND SYSTEM I BOUGHT THAT DOESN’T WORK WITH A TOP LINE TV!

I may try the HD Fury Arcana, although they tell me I need to also purchase one of their 4K HDMI switchers, which isn’t an ideal solution because, 1) it means I can’t adjust the video for each device since they’ll all be going into the same input on the TV, and 2) between the Arcana and the HDMI switcher we’re talking another $600!!!

So, two questions for SONOS, or for anyone here who might be able to help me solve this.

  1. Is Sonos planning on FINALLY, at long last, providing some sort of firmware update to the Sonos Arc soundbar (and their other soundbars) to fix this audio sync issue? I’m assuming the answer is no, but hey, I’d love to be wrong.
  2. Short of that, I’m considering upgrading my TV to a 65”. What TV’s, preferably an OLED type, work best with the Sonos sound system. I.E., they have ZERO audio sync issues? Can Sonos provide a LIST of TV’s that work best with the Arc Soundbar? Or, how about a list of TV’s that DON’T work with the Arc Soundbar? That feels like a reasonable request. (A Sonos rep I spoke to told me, on the sly, that the new Samsungs do not have issues. But then I read about all kinds of Samsungs that do. Has that changed?)

Thanks so much in advance for any help and thoughts on what I should do next. -- Ian

Believe it or not, this is actually an hdmi ARC protocol issue. The ARC standard does not mandate lip syncing and thus is not widely supported, or if it is, it's implemented differently among manufacturers. When you want to pass surround sound via Hdmi ARC, it must be done via bitstream (compressed audio such as 5.1 dolby digital) since arc does not support pcm uncompressed 5.1 (it is sent as two-channel stereo instead due to arc bandwidth limitations and other reasons I may be unaware of).

 

So if you want any audio delay issues to be 99% of the time fixed while utilizing Hdmi ARC / passthrough, you must send it as PCM two-channel audio. This is the downside of Hdmi ARC...it can introduce audio delays since when your TV has processed both the video and audio, it sends the compressed dolby digital or dts (both bitstream) to the audio receiver / sound bar and does not know how long that receiver or Soundbar will take to process that audio. Therefore, it is not uncommon for the audio to actually come after the video.

Unfortunately, most TVs are not able to delay the video to sync up with the delayed audio except for some very modern tvs (I believe samsung has a couple models that do this... They can delay both audio or video...so an audio delay and negative delay to match the video coming before the audio).

I am not sure why all TVs are able to delay audio but not the video since HDMI ARC has this common issue and nobody wants to output PCM uncompressed audio to their Soundbar receiver as it can only be passed through as two channel audio. It solves the issue of audio delay since the TV knows when it has processed each of the video and audio and can send both out at the same time and the receiver or sound bar simply has to then play the audio, rather than decompressing it from Dolby digital to output to its speakers as the directly playable pcm. 

Adding my name to the list, 49SK8500PLA (LG 2018 nanocell) and Sonos Beam. HDMI devices such as FireTV stick and BT TV box show significant (300ms or so) audio delay when set to dolby digital, fine with stereo. Tried all the settings under the sun to try and get the TV to passthrough the audio as is, adding no delay. Tried talking to LG support but they said they couldn’t reproduce the issue.

 

Here’s hoping we get some kind of help for this, as it looks like a serious problem.

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I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

I picked up a cheap HDMI splitter/audio extractor and it fixes the audio delay issues I had, unfortunately, there are issues with the transfer rate of 4K video using the splitter that cause a flickering screen, which is to be expected from a £16.99 splitter!

There are many splitters out there, and some (like mine) advertise as working with 4K@60fps, but they are hit and miss I feel and mostly seem to be cheap and nasty solutions.

If you only have one external device to hook up you could try the HDFury Arcana, but it’s expensive.

My ultimate solution is a new TV, but I am due an upgrade anyway.

I have three devices (set top box, PS4 & TV) which I would need to connect. I have just found out that the HDFury Arcana doesn’t support the Beam anyway sadly. A new TV may be the best option for me but it’s a lottery as I would have no way to know which TV’s/males have this issue and which ones don’t.

I think your best option is to try a splitter/audio extractor. Are you using a base PS4 or Pro? I ask because if you don’t need 4k support then there are more options available.

I have been recommended this which may be similar to what you’re referring to maybe? https://www.amazon.co.uk/dp/B08611PJKR/ref=cm_sw_r_u_apa_fabc_Jdh9FbPPR6B7K?_encoding=UTF8&psc=1

I think if I used that I would connect the Beam to this via optical, and then connect the TV, PS4 & Satellite to this via hdmi, with 1 hdmi from this to my TV.
I have a PS4 currently but I hope to get a PS5 in the near future.

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I don’t think this is purely a Sonos fault. I have a panasonic OLED and does the same as LG tvs. But apps on the TV itself works fine. There’s >100ms sound delay when using the PS5. It’s very annoying. But I don’t think this is purely a Sonos issue. It’s LG, Panasonic, Samsung etc. All have issue with it. Even going from optical out on the TV. There’s something in these TVs that are causing the delay to the beam.

 

These TVs don’t like dolby bitstream. Linear PCM (2.0) is fine no delays whatsoever.

I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

I picked up a cheap HDMI splitter/audio extractor and it fixes the audio delay issues I had, unfortunately, there are issues with the transfer rate of 4K video using the splitter that cause a flickering screen, which is to be expected from a £16.99 splitter!

There are many splitters out there, and some (like mine) advertise as working with 4K@60fps, but they are hit and miss I feel and mostly seem to be cheap and nasty solutions.

If you only have one external device to hook up you could try the HDFury Arcana, but it’s expensive.

My ultimate solution is a new TV, but I am due an upgrade anyway.

I have three devices (set top box, PS4 & TV) which I would need to connect. I have just found out that the HDFury Arcana doesn’t support the Beam anyway sadly. A new TV may be the best option for me but it’s a lottery as I would have no way to know which TV’s/males have this issue and which ones don’t.

I think your best option is to try a splitter/audio extractor. Are you using a base PS4 or Pro? I ask because if you don’t need 4k support then there are more options available.

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I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

I picked up a cheap HDMI splitter/audio extractor and it fixes the audio delay issues I had, unfortunately, there are issues with the transfer rate of 4K video using the splitter that cause a flickering screen, which is to be expected from a £16.99 splitter!

There are many splitters out there, and some (like mine) advertise as working with 4K@60fps, but they are hit and miss I feel and mostly seem to be cheap and nasty solutions.

If you only have one external device to hook up you could try the HDFury Arcana, but it’s expensive.

My ultimate solution is a new TV, but I am due an upgrade anyway.

I have three devices (set top box, PS4 & TV) which I would need to connect. I have just found out that the HDFury Arcana doesn’t support the Beam anyway sadly. A new TV may be the best option for me but it’s a lottery as I would have no way to know which TV’s/males have this issue and which ones don’t.

Adding my name to the list - received an Arc SL for Christmas and have it connected to my LG C8 77 OLED via ARC and am seeing fairly significant audio delays with both external HDMI inputs (ie: cable box) and internal apps (Netflix, Disney +). I’ve tried all the suggested settings, especially the AV Audio Delay with Bypass which helped but unfortunately didn’t solve all the issues. I’ve tried contacting LG who were less than helpful given my TV is out of warranty (purchased in 2018) and Sonos said they could only recommend using the audio delay function in the app, trying a factory reset and contacting the TV manufacturer.

I’d really like to avoid having to purchase additional hardware (ie: HD Fury Arcana) to solve this - any other ideas or anything I can do to escalate?

Thanks!

I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

I picked up a cheap HDMI splitter/audio extractor and it fixes the audio delay issues I had, unfortunately, there are issues with the transfer rate of 4K video using the splitter that cause a flickering screen, which is to be expected from a £16.99 splitter!

There are many splitters out there, and some (like mine) advertise as working with 4K@60fps, but they are hit and miss I feel and mostly seem to be cheap and nasty solutions.

If you only have one external device to hook up you could try the HDFury Arcana, but it’s expensive.

My ultimate solution is a new TV, but I am due an upgrade anyway.

I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

Obviously the sonos receiving device will only play the (sent) audio when it gets it from the connected TV - a splitter/extractor will make no difference to inbuilt TV Apps/TV audio, but may make a difference for cable TV boxes and other devices etc that are normally connected to the TV and pass their audio through the TV ports… it’s often that pass-through of the audio where the delays occur with some TV’s and a splitter/extractor will bypass the TV ports. Some TV’s now have pass-through options too one example which I use is an LG C9 TV but a splitter/extractor is a worthwhile consideration if you don’t wish to change TV.

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I have the same issue with a Philips OLED TV. I complained to Sonos & Philips. Sonos said it was the TV. Philips sent me an upgraded TV but the issue remains. Sonos say it is the TV that is the causing the issue when trying to process the 5.1 signal. My workaround is an optical splitter which isn’t ideal. They say TV’s with eARC are preferable but I don’t know if that’s true.

Is a HDMI splitter a better option?

I am contemplating asking Philips to take the TV back and I will get another TV (with eARC). But reading the forums I may get another make TV with the same issue. So frustrating.

I have lip sync issues using a 2016 Panasoni Viera TV with 5.1 audio from an external source. Interestingly, when I output sound via the TV speakers and lower my Sonos Beam volume, the audio delay is still present. Also, when I use built-in TV apps with 5.1, and output audio over Sonos Beam, there is no delay.

In summary, it is an issue with the TV and nothing to do with the Sonos.

There is so much discussion on this topic that I’ve covered and I’ve come to the conclusion that there are two solutions.

  1. Use a TV that supports 5.1 pass through over ARC/Optical with no delay (best).
  2. Use a HDMI splitter with audio extractor (workaround).

I’m going for option 2 in the short term, option 1 longer term.

There is an interesting post above whereby a user describes how a recent Roku TV update has fixed the issue, I may look to TVs supporting that.

 

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Were there any recent official Sonos replies to this issue?

We are in the Official Sonos community page, aren’t we? :thinking:

LG NanoCell 85, Xbox Series X, Sonos Beam.

Sync issues using built in apps, external apps, and Series X. Have tried all the settings and recommendations (HDMI Arc, Optical out, tried all settings on both TV and Series X).

Seems like this has been an issue for multiple years so will likely never be resolved, kind of a joke that this product is even on sale. Wish I had done more research before purchasing, but luckily I can return it with no issue.

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Joining the thread with my Xbox Series X, Sonos Arc + Sub Gen 3 + LG 65 CX.

Suffering from audio sync delays occasionally, since I’m new to this setup, I still can’t describe exactly when it occurs.

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Hi there,

 

Same problem for me with a OLED 55GX from LG and Sonos Beam+Sub+2play:3. All outputs set up in HDMI Dolby Digital 5.1. With gaming it becomes a bit difficult to play when you have half a sec delay on door opening sounds and etc…

Problem does not happen on streaming services, I did not notice a major issue with lip synch. The Air play works well via the TV or directly to the Sonos environment. (then I loose the 5.1). 

Solution for me was to put a headset on the PS4 controller.

All set up is up to date.

Any news from LG?

 

Regards,

Eric

Hello there!

So i had Xbox One X with Samsung TU8500 and Sonos Beam: same audio delay issue we’re discussing here.
But today i bought Xbox Series X and that’s bad but the problem is identical and Series X doesn’t have an optical output

Any updates/news/taken actions, Sonos?

It might be easy just to switch to other vendor and get rid of Beam, but i wouldn't do that if fix arrives

I’m actually curious if Sonos can actually do anything about this at all. If the sync is being added because the tv is processing the audio by decoding and re-encoding it, I’m not sure how they could fix that.

I have a TCL s403 which is a Roku tv. Just a couple of weeks ago it got the roku 9.4 update, which adds the option to pass through the audio without processing it. This fixed the sync issues I had there so I assume this will be the same on any TCL tv that can get that 9.4 update (which should be everything that is from 2017 and up, if not a little older).

I can tell you what does have audio sync issues and that is the Sony x750h that I just took back to Best Buy. It does not have an option to not process the audio and seems like even when outputting to PCM through optical (from the back of the Tv) it had sound delay when I was using my Xbox Series X. Unfortunately, both the new consoles no longer have optical ports so it’s pretty imperative to get something that works through the HDMI-ARC, so at this rate I kind of want to upgrade to a 6 series TCL. Unfortunately it’s a little bit more than I was hoping to spend (was hoping to get a deal during black November or whatever the sales are called now).

Does anyone know if the Vizio m-series has this issue? I see some good deals for a 65 and the hdr brightness seems ok. The instruction manual shows audio options of setting to output bitstream so I don’t know if that means it will process it and add the lag.

I hear you. Thanks for the response. Nice to know I’m not screaming into the void. To your point, this is why Sonos should make it clear which TV makes/models work with their soundbars. OR, work with the TV manufacturers to solve this problem already. Because it’s making them all look bad and leaving a lot of their best customers - people who want a high quality audio solution - super frustrated and feeling ripped off.

I’m actually curious if Sonos can actually do anything about this at all. If the sync is being added because the tv is processing the audio by decoding and re-encoding it, I’m not sure how they could fix that.

I have a TCL s403 which is a Roku tv. Just a couple of weeks ago it got the roku 9.4 update, which adds the option to pass through the audio without processing it. This fixed the sync issues I had there so I assume this will be the same on any TCL tv that can get that 9.4 update (which should be everything that is from 2017 and up, if not a little older).

I can tell you what does have audio sync issues and that is the Sony x750h that I just took back to Best Buy. It does not have an option to not process the audio and seems like even when outputting to PCM through optical (from the back of the Tv) it had sound delay when I was using my Xbox Series X. Unfortunately, both the new consoles no longer have optical ports so it’s pretty imperative to get something that works through the HDMI-ARC, so at this rate I kind of want to upgrade to a 6 series TCL. Unfortunately it’s a little bit more than I was hoping to spend (was hoping to get a deal during black November or whatever the sales are called now).

Does anyone know if the Vizio m-series has this issue? I see some good deals for a 65 and the hdr brightness seems ok. The instruction manual shows audio options of setting to output bitstream so I don’t know if that means it will process it and add the lag.

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.

Incredible to me that 3 YEARS LATER this is still an issue. What’s the deal, Sonos?!

My situation… I have an LG 55C7P OLED TV. I have three peripheral devices connected to it via the C7’s HDMI inputs -- a DirecTV box, 4K AppleTV and a 4K Blu-Ray player. 

My Sonos Arc Soundbar (along with Sonos Subwoofer and two Sonos Ones as rears) is connected using the HDMI-ARC port on my TV. I continue to have major audio sync issues with all three peripheral devices when they’re playing content with Dolby Digital or Dolby Atmos audio. There are no sync issues when I use the LG TV’s internal apps. The only way I can get rid of the sync issues is by switching the peripheral devices to PCM, but that, of course, defeats the purpose of having this INCREDIBLY EXPENSIVE SOUND SYSTEM I BOUGHT THAT DOESN’T WORK WITH A TOP LINE TV!

I may try the HD Fury Arcana, although they tell me I need to also purchase one of their 4K HDMI switchers, which isn’t an ideal solution because, 1) it means I can’t adjust the video for each device since they’ll all be going into the same input on the TV, and 2) between the Arcana and the HDMI switcher we’re talking another $600!!!

So, two questions for SONOS, or for anyone here who might be able to help me solve this.

  1. Is Sonos planning on FINALLY, at long last, providing some sort of firmware update to the Sonos Arc soundbar (and their other soundbars) to fix this audio sync issue? I’m assuming the answer is no, but hey, I’d love to be wrong.
  2. Short of that, I’m considering upgrading my TV to a 65”. What TV’s, preferably an OLED type, work best with the Sonos sound system. I.E., they have ZERO audio sync issues? Can Sonos provide a LIST of TV’s that work best with the Arc Soundbar? Or, how about a list of TV’s that DON’T work with the Arc Soundbar? That feels like a reasonable request. (A Sonos rep I spoke to told me, on the sly, that the new Samsungs do not have issues. But then I read about all kinds of Samsungs that do. Has that changed?)

Thanks so much in advance for any help and thoughts on what I should do next. -- Ian

So now I'm reading that the new consoles won't have an optical out port. This somewhat scuppers me as my current setup is my devices connected to an optical splitter and then to the beam. Going through Arc adds a delay so that's not really an option for me. I'm a bit of a noob when it comes to AV stuff, does anyone have any suggestions? 

Playbar with lg c9. same issues. heavy sound delay when using external sources like ps4

Just ordered a Beam and 2 one SLs, this will be my plunge into the Sonos ecosystem but I have read that Sony Bravia TVs seem to have some lip syncing issues. I have had similar issues with an HDMI ARC soundbar (TCL) that I just returned that was used with our 55” Sony X900E and this had lip syncing issues that I could not solve. I understand that it is the TVs fault in the way it processes the audio. To keep this short and sweet I will be using this with a 65” Sony X900H what is the best option to remedy this issue? Audio extractor, switch, etc? How does this affect controlling the volume on the beam as well?

Just looking to figure this all out before we move into our new home in November!

Beam should be here tomorrow.

Thanks,

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