If you're experiencing audio delay issues, read this



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Sonos can only play a sound as quickly as it is handed the sound on a digital input. All analog inputs are subject to the 70 ms delay for buffering that Sonos requires. 

It is indeed unfortunate that there are many TVs that apparently can’t pass through an HDMI input without processing and delaying that input. 

Hi Bruce, sorry you’re right I didn’t make it clear, having read through this forum thread (and countless others) I completely agree it doesn’t seem to be a Sonos problem at all. In fact it seems to be somewhere between TV manufacturers and, in my case, Xbox. As all my media comes from the Xbox, I’ve opted for the optical adapter solution which has completely eliminated the problem.

Worth noting, I was still able to pair my TV remote for volume control via the Sonos app. The only real caveat of using optical over Arc is the loss of TV control via Google Assistant or Alexa. Neither of which was a deal breaker for me.

Sonos can only play a sound as quickly as it is handed the sound on a digital input. All analog inputs are subject to the 70 ms delay for buffering that Sonos requires. 

It is indeed unfortunate that there are many TVs that apparently can’t pass through an HDMI input without processing and delaying that input. 

I'm having the same issue. Just bought a new LG C7, Xbox One X. It is just terrible. You should plug in a pair of headphones into your xbox controller and you'll see just how bad it is. I haven't set up my Roku yet to see if I have the same issue, but it sounds like I will. Very disappointing. When I was playing Destiny it was crazy bad. My shots sounded like they were an echo.

Quite remarkably I came to this forum because I’ve just got a Sonos Beam with surround. An Xbox One X and noticed severe audio delay when playing Destiny. It’s unusable. However comforting to find I’m not the only one with the issue it’s exceptionally disappointing that your post was 2 years ago and the problem remains. What a shame

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Just to clarify, my ATV is set to output DD5.1. And my beam was connected using ARC. There is a lip sync issue with all apps except the TV+, which for some reason is perfectly in sync. Just thought it was strange. When I connect to the beam using optical everything is in sync anyway.
 

I was just experimenting as I would like to go back to ARC instead of optical as it’s just messy using audio extractors and optical switches, and would save a lot of excess cables behind the tv unit. 

I’m not sure if you mean no lip sync issues, or no lip sync.

If you set your Apple Tav’s audio settings properly, it will only send Dolby Digital audio to your TV, and the TV would then forward that to your Sonos.

That may be a moot point when Sonos releases S2, we don’t know yet, and it would also depend on your connection method. For instance, I have an optical connection, which I believe can’t carry Dolby Digital Plus anyway. 

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I found the weirdest thing today. Whenever I watch Netflix, Disney+, etc via my Apple TV I always get lip sync issues. However, when I watch something on Apple TV+ it will stream in 5.1 DD with no lip sync whatsoever. It’s really weird. One day I’ll figure it out but I will probably have got an eARC TV by then. 

@Marc_51, as soon as I find one, I’ll be posting it where ever I can. So far, nada. But then again, I suspect the market for such a device has increased many fold, so it would not surprise me to see something two or three months down the road. I’ll make do with HDMI-ARC for now. 

Hi,

 

Can B9/C9 owners confirm if audio sync is still a problem in those models? I’ve heard a firmware update fixed it. Thanks

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That device doesn’t create eARC, it merely passes it along when it’s connected to an eARC device that is sending it (via HDMI 1)

You’re right. Realised it today after reading up on the ARC input requirements of the Beam and Arc. What we need is a splitter that can mimic an eARC. 

That device doesn’t create eARC, it merely passes it along when it’s connected to an eARC device that is sending it (via HDMI 1)

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I took 10 minutes yesterday looking for such a device on Amazon, and could not find one.  Doesn’t mean they don’t exist, but Amazon US doesn’t seem to recognize the search terms I was using, I got a bunch of devices that can accept and pass an eARC signal, but none that could natively create that signal from an incoming HDMI input. 

I’d imagine there are some folks working on that right now, given there’s a rather pent up demand for such. It will be interesting to see what price point it comes in at, as most devices that include that type of electronics are TVs, and the opportunity for us to notice a significant price difference is low, since there’s so many other electronics in that package.  Perhaps someone like Flexson is already dealing with a purveyor that’s close to production? We just don’t know. 

Here is one I found earlier on amazon 

https://www.amazon.co.uk/dp/B07L3L9TF5/ref=cm_sw_r_cp_api_i_dJfTEb7ZM2KMV

 

XOLORspace 63021PRO 1x2 4K 60HZ HDMI Splitter YCbCr 4:4:4 8 bit HDR 1 HDMI input 1 HDMI audio/video output and 1 HDMI audio output only, with audio extractor Optical, stereo 

I took 10 minutes yesterday looking for such a device on Amazon, and could not find one.  Doesn’t mean they don’t exist, but Amazon US doesn’t seem to recognize the search terms I was using, I got a bunch of devices that can accept and pass an eARC signal, but none that could natively create that signal from an incoming HDMI input. 

I’d imagine there are some folks working on that right now, given there’s a rather pent up demand for such. It will be interesting to see what price point it comes in at, as most devices that include that type of electronics are TVs, and the opportunity for us to notice a significant price difference is low, since there’s so many other electronics in that package.  Perhaps someone like Flexson is already dealing with a purveyor that’s close to production? We just don’t know. 

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I have a 4 year old Panasonic dx902b. When I connect my beam via arc I seems to get a 250ms delay from externally connected hdmi DD 5.1 sources, however, internal TV apps will output DD5.1 perfectly in sync. 
 

At the moment I am running everything into the beam using an optical connection via a hdmi switch with optical output. The beam will now play audio with no sync issues. Bypassing the TV audio processing seems to solve the problem but this also means that I can not upgrade to the new Arc until I:

a) upgrade my TV as I will not be able to get atmos via optical input. 
b) accept the 250ms audio delay. 
 

Neither of these options seem likely. Does anyone know of an hdmi Splitter that can split the audio and video via hdmi rather than optical so it can be fed into the beam/Arc directly ?

@Airgetlam I don't fully understand the fundamental issue with HDMI ARC and the sound signals, but I was thinking perhaps a new product would bring a solution some other way. Thinking.only about the issues I've noticed... I don't get any lag over the PS4 with Linear PCM (but it's a Stereo 2.0 signal). I don't know if somehow the soundbar just doesn't do 5.1 unless it's Bitsteam, but my hope is for PCM 5.1 essentially, over HDMI ARC. Maybe it's a pipe dream, but I've got my fingers crossed something will get sorted out.


I am very much in the same boat as you! I’ve found the following on the LG forums

https://lgcommunity.us.com/discussion/4423/oled-c9-edid-limitation-regarding-hdmi-earc-pass-through

“LG will be introducing PCM Multi-channel support when using eARC in the 2 quarter of 2020. This will be possible via a software update for 2019 & 2020 TV that support eARC.”

Not sure but wonder if this will mean that the LG following update will pass a 5.1 LPCM signal? Also not sure how the Sonos soundbar will use it if it does...

Couldn’t agree more. I’m certain that Sonos isn’t instantaneous, either, but given how well it works in other TVs, as well as if you pull the audio out before it hits the TV, it’s hard to imagine anything other than the TV is the issue here. 

I appreciate the discussion from someone who is interested in the discussion, and is willing to consider all aspects of the situation. Rather frequently in these forums, people have decided that Sonos is the issue, and are not dissuaded by other perspectives. Sonos isn’t perfect, IMHO, but the fault on this issue is not them. But I’ve not found a better system out there, Sonos certainly meets the needs I have for now. Would love it to do more, and I hope in time, the opportunity for them to continue evolving will happen.

Stay safe, and have a lovely weekend!

Makes sense to me. It's a tough thing to get right. I hope LG, Sonos and Samsung can implement firmware or software solutions that work for the stuff everyone's already bought. I did some more googling and found a rather interesting blog from Dolby in 2018 that explains a lot of these troubles quite well. Worth a read for anyone else who winds up here.

Dolby blog link:

https://developer.dolby.com/blog/dolby-audio-over-hdmi-part-3-reality/

The blog has a sentence that makes for a decent tldr;

"Decoding audio and video in devices requires some processing time, and each process introduces different time delays, or latencies, in each device."

I’m not an electrical engineer, so take my assumptions as such, but it’s pretty clear to me that if stripping out the audio before it reaches the TV using an HDMI switch, it’s evident that there is an issue with the handling of the Dolby Digital signal inside the electronics of the TV. I’d expect that a stereo (PCM) signal gets handled by different electronics, which is why the Dolby Digital signal is delayed, and the stereo signal is not. I think that’s a fair indicator that the issue isn’t on input, as I suggested in my previous post, but there must be some additional processing / pathway occurring when the signal is Dolby Digital. 

But yes, if and when Sonos adds more options for encoding to the audio stream for their home theater products, it’s possible that the TV will not delay that stream, and present it at the same speed that they do the stereo stream. But that still depends on the capability of the electronics in the TV, and has nothing to do with Sonos, for all practical purposes. 

So far, the only mention I’ve seen from Sonos is inferred to be about music encoding, nothing but speculation, including my own, about the Home Theater stream getting extra codec interpretation. 

And even if that occurs, there will be a significant amount of frustration from owners who currently use optical, as most other codecs are not able to be carried by optical due to limitations in bandwidth. I’m not looking forward to the posts of condemnation for Sonos having chosen such a transport method, although I suspect at the time that the PLAYBAR was designed, HDMI-ARC didn’t exist, or if it did, it wasn’t in wide enough use to make sense from a cost perspective to put it in to Sonos, and it wouldn’t have sold because, at the time, the majority of TVs wouldn’t have supported it.

But certainly, if the maker of the TV set handles the new codec stream in a different manner than they do for Dolby Digital, you’re absolutely correct. I have my doubts that they do/will, but who knows, other than the folks who created the TV set. 

We’ll have to see. My crystal ball seems to be broken ;)
 

@Airgetlam I don't fully understand the fundamental issue with HDMI ARC and the sound signals, but I was thinking perhaps a new product would bring a solution some other way. Thinking.only about the issues I've noticed... I don't get any lag over the PS4 with Linear PCM (but it's a Stereo 2.0 signal). I don't know if somehow the soundbar just doesn't do 5.1 unless it's Bitsteam, but my hope is for PCM 5.1 essentially, over HDMI ARC. Maybe it's a pipe dream, but I've got my fingers crossed something will get sorted out.

Let me modify that. If the TV has a separate process for handling eARC, and the new Sonos sound bar accepts such a signal, it might make a difference. Right now, it appears that any HDMI input on several TVs is impacted by this delay. Until there is a Sonos or other speaker that works via this third output method, we have no real proof if it is an issue on input to the TV, or an output issue. 

The problem isn’t in the Sonos, so a new version of one of their sound bars won’t change anything. 

My setup:

LG OLED 55C8

Sonos Beam Connected via HDMI ARC

2x Sonos One SL (5.1) connected via WiFi

Chromecast Ultra, Sony PS4 Pro, Nintendo Switch

I read through about 5 pages of this thread. I really don't wanna go out and buy anything like a HDMI audio extractor to fix it. Tried a few things and the only way I could get rid of the delay is physically bypassing my TV with the provided HDMI-Optical cable to get a Digital 5.1 signal from my PS4 straight to the beam. HDMI ARC, optical/HDMI thru TV all produce a slight ~250ms lag. Linear PCM has no delay, only when the beam is running in Digital 5.1 do I notice the issue. I've tried LG's sync delay bypass to no avail as well... Beginning to think there's no fix here. 

Ah well. Maybe they'll announce a new soundbar on the 6th and I'll just buy that, or just use something else. If anyone thinks there's a solution though I'd love to hear it. For those of you who have had luck with the LG Bypass option I'm glad, but no dice for me.

 

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SOLVED ????

 

I was looking in the wrong spot.   My LG OLED menu under audio had a choice between AUTO and PCN for optical out

 

But looking under the Lip Sync adjustments in another menu, there is a BYPASS OPTION !!!

 

When I chose it, all seems OK now.    

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I’m looking at something like this

 

https://www.amazon.com/J-Tech-Digital-Premium-Quality-TOSLINK/dp/B00HQ2R37S/ref=sr_1_1_sspa?dchild=1&keywords=toslink%2Boptical%2Bswitcher&qid=1587104842&sr=8-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExWlo3RklMUUVOMkU5JmVuY3J5cHRlZElkPUEwNDYxOTYxMlNWSVdKTlhTUk83QSZlbmNyeXB0ZWRBZElkPUEwMzY0MTc0M1U4NVRTM1FFUzJKTCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU&th=1

 

 

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While I agree with your irritation, this isn’t something that Sonos can be involved in.

 

 

Well…..if Sonos is aware of it, they should state the product works fine on TVs A, B, C, but not on E, F

They are counting on a Toslink output without a cross manufacturers standard.  

 

This is annoying to me because I have the same TV and I had no sync problems before Sonos.      

 

 

 

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Voice sync delay issue  Sonos Playbar, Sun, 2 Play:1s, Sony Bravia TV and Xfinity cable  

I am having the same problem with a Playbar, Sub and 2 Play1s as many others. For months, A temporary fix for me has been to change the channel and then immediately come back to the channel I was watching. And it’s fixed for a little while. Then the delay returns. Thinking it was the cable box I called Xfinity and got a replacement cable box. That didn’t fix it. Then I played with the delay options in the Sonos settings. That didn’t work. So I disconnected the optical cable and went back to TV audio. Guess what?  No sync issues Sonos!  So I’m guessing that it’s the optical interface that’s the problem. I am really angry about this because a lot of people are experiencing it, not just me or us. I am referencing your case # 171023-002526 and will post my own on this  

Sonos, please help us. 

 

vinman61855,

 

  1. https://www.amazon.com/NewBEP-Switcher-Selector-Extractor-Splitter/dp/B07438WJ8G/ref=sr_1_7
  2. https://www.amazon.com/AV-Access-Extractor-Splitter-Amplifier/dp/B07D9BNVM1/ref=sr_1_21_sspa
  3. https://www.amazon.com/Extractor-Koopman-Optical-Converter-Supports/dp/B082KW5MXS/ref=asc_df_B082KW5MXS

 

I think you hit the nail on the head.   Seems logical that the TV isn’t processing fast enough.   But I don’t have a problem with my Apple TV -- only my cable box.   I’ll test a BluRay later today and report back

 

The first choice in extractors above is the only 4 port 4K/Dolby Vision and it isn’t available anymore.   All four of my sources have optical out so I can test if it is my LG OLED output that’s the problem by just temporarily bypassing the TV optical out.  

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