I occasionally get a loud buzzing over the audio from Beam connected with HDMI

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I'm not happy about setting my tv out put to PCM  as the quality is not as good. I'm still feel the update is to blame here. I repeat there was no issue before the update. 

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It is possible that the update may have reset the CEC connection between your TV and the Beam but the only change consistently reflected in the data is the formatting of the signal coming into the Beam from the external HT source.

Other than that, I could not say.      

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Hello Jean, 


If this is the case why has it only happened since the Sonus 2 update. I never experienced any difficulties before the update.

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Hello all,

I’ve looked over the submitted diagnostics and have this to offer:

If you have only a Beam and no bonded surrounds, make sure that your TV is set to output PCM rather than Dolby Digital or “Auto”.

If you have bonded surrounds, make sure that it is not set to “Auto” but to either PCM or Dolby Digital. 

If this issue is only occurring on certain sources e.g. PBS content or YouTube (or Netflix or Prime) check to see if you can adjust the audio format for that account or streaming app.

If you have a Samsung TV, does switching to the provided optical adapter change anything?

Have you fully rebooted your TV since this issue began (unplug completely from power then plug it back in)

In most cases this issue has entirely to do with the audio format that the TV is passing on to the Beam and this is reflected in the diagnostic data as well.

If all suggestions in this thread have been exhausted, please reach out to us directly for one-on-one support. 


Same issue here, started when using YouTube App on Samsung TV, unfortunately disconnecting and reconnecting does not resolve the issue, even temporarily

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I'm now also getting issues with the sound not playing when I turn my tv on. I have to pull the HDMI Arc cable then reconnect it. This has happened 6 times in the last 10 days. 


Also, it seems Sonus have turned their backs on this issue for the time being as I've not had an up date in over a week. Over £600 spent on Sonus equipment since last Christmas and all the problems started after the S2 update.

I can confirm that as well as seeking backwards in the Prime app on my TV triggering it, I too get the issue when using the YouTube app.

Today my wife and kids resorted to simply unplugging the Beam and not using it. It's turned into a rather expensive ornament.

The Beam is the only Sonos product I own, so there's no tangible benefit (as far as I can see) to me using S2. Is there a way of simply rolling it back to S1 firmware? I suspect that'll fix it.

I have the same issue after updating Sonos. LG TV, YouTube, loud buzzing. It has been continuous. Tried disconnecting and also turned off the Quick Start option as mentioned, but buzzing still happens. 

Diagnostic confirmation - 1686699081


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This has happened to me a couple of times with Beam connected to Samsung ks7000 via optical cable.


Pulling the power fixes it, it doesnt happen 99% of the time - v odd

So this happened to me again this evening when using the Amazon Prime Video app on an LG TV. Specifically it happened when I paused the programme and attempted to seek back a few minutes.

Once the buzzing started it continued even when closing the prime app and switching on the Sky box. Anything that used the HDMI connection the buzzing was there.

Unplugging the Beam was the only fix.

Diagnostic report of the buzzing occurring: 1534378377

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Sonus seems to have gone quiet over this issue. Please could we all have a further update.

Same problem as described in various comments here.


Music plays fine without the buzzing but once the TV (Samsung QLED) is switched on, the buzzing starts even without opening Netflix or Youtube. 

Submitted a diagnostic report: 1755628959

I have had the exact same issue 3 times since the S2 update, though I'm yet to grab a diagnostic of it happening.

I have a Beam connected via HDMI Arc to an LG TV. In all 3 cases it's happened when using the Prime Video app on the TV itself (although even this doesn't happen every time).

Turning the TV off stops the buzzing, but as soon as the TV is switched back on again the buzzing returns, even when just viewing a menu. Similarly, unplugging the TV from the mains and plugging it back in again, as soon as the TV is switched on the buzzing returns.

Disconnecting and reconnecting the HDMI leads from both ends doesn't fix it. As soon as the HDMI is reconnected the buzzing restarts.

As others have mentioned, if I switch the TV off and then get the Beam to stream some music, it sounds fine. Turn the TV back on again, and the buzzing returns.

The only thing that fixes it is pulling the mains on the Beam.

I have a Sky box and a PS4 plugged into the TV via HDMI too, and have tried disconnecting these in case the TV is trying to pass nonsense from one of those (both are on standby), but again the buzzing continues.

I had no issues of this kind with the S1 firmware so can only assume that the S2 firmware is causing the issue.

It's set to auto sound everywhere.

Like the post above, it's only on YouTube and Netflix so far, it will play music and TV fine, but if you go back into those services it will buzz again until powered off. 

Also YouTube and Netflix have a different buzz.

If there's anything else I can test to help, let me know

If it’s any help, but slightly off-topic, I’m having a similar issue intermittently with my PlayBase since upgrading to Sonos 2. I’m using a TOSlink connection from a Sony TV. The audio format is Dolby Digital 5.1. The set top box and TV are connected via HDMI (non-ARC).

I have the problem only when watching PBS stations. It goes away if I switch to a non-PBS channel but returns when I switch back to PBS. It goes away on the PBS channels as well if I put the TV and STB to sleep then wake them up.

Could it have something to do with the way British TV programs are re-encoded for broadcast in the USA?


same problem here - couple years old Samsung TV and Beam connected with ARC - got first humming problem this morning, got 2nd time after couple of hours.

Some details that might help:

Humming is only on right channel while left channel is playing what seams to be correct sound.

When noise started second time tried changing output settings on TV - originally had Dolby Digital and when changed to PCM the hum frequrncy/pitch changed and when switched back to Dolby Digital pitch went back. Toggled this setting couple of times and it was constant behaviour like this.

Hum appeared only when there was sound coming from TV - no hum while in TV menus, only when Plex playback was active in my case. 

Played some audio from Sonos app - no problems, switched back to TV - hum came back.

Reconnected HDMI - silence when discinnected, hum when cinnected back.

Powercycled TV - no change.

Problem went away when powercycled Beam.

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No update for my LG tv recently.

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Hello @montrano, Thank you for the new reports. 

The audio format from your TV is reading as “silence” in the data, can you double check to see what audio format the TV itself is set to output?

@Vosabhoy, as soon as we can pin down why this is happening, it can be fixed. right now the issue seems to be limited to certain TV manufacturers and systems. believe me, I appreciate the fact that it was working before. Did your TV receive any kind of firmware update around the same time that the Sonos system upgraded?    

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The long and short is that I didn't have any issues before the latest Sonus update. What are Sonus going to do to do about this fault????

My TV doesn't have the quick start option, its a couple of years old. 

Ive tried restarting the router and the TV, the only thing that seems to get rid of it is power cycling the beam. Interesting that it was almost exactly 24 hours since it last happened. 

I did a couple more diagnostic reports to try and narrow down the issue, one while its buzzing and one after a restart.


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When you are watching TV, is this coming from a smart app on your TV or from an external streaming device like a Roku or cable box or game system?

Are you able to look at the audio format settings of any app, service or device to make sure that it is in a format supported by the Beam. 

If your TV audio format is set back to “Auto” make sure that any sources aren’t passing an incompatible audio signal.   


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Problem arose again tonight watching television channel. Had to pull the power cable on the beam then reconnect. Convinced it's a problem with the recent update.

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Hi, the HDMI cable is secure. PCM source sound quality is not as good as auto. I was playing music through the speakers and all seems well so far.

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Ah, thank you @Vosabhoy.

You had said that the only options available for the HDMI/ARC out were PCM or Auto, correct? 

If it is still set to “Auto” does  changing it to PCM make any difference? 

Do you notice any audio issues while your home theater source is playing or only when it is off?

Can you double (triple) check that the HDMI connection itself isn’t loose on either end. 

If you begin playback on a music source, does this audio disturbance persist while playing other sources?

I know this feel like 1,000 questions. I’m trying to pin down why disabling the Quick Start+ didn’t work as it should in your system. 

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Diagnostic 1485429350