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

1 page and a couple other threads vs. 100 pages+ and dozens of other threads.  I know where I'm putting my money.

This is only a temporary solution as it happened again with me 2 days later. Definitely down to the Sonus 2 update.

Happening to me as well and I have the exact same setup as the original poster. Samsung TV connected over HDMI ARC, beam, sub, 2x1’s. 
 

only noticed today but definitely believe this is an S2 issue or at least a recent update that caused it. 
 

same tests. Unplugged HDMI and no issue. Plugged in HDMI. issue. Streaming Music, no issue. 
 

to the Sonos support team this was definitely not an issue with config or tv settings as these haven’t been changed in… forever. I’ve had this setup for a while.  

Hello @Murpa,

Since your set-up does not include any bonded surround speakers, switching your audio format to PCM (or Stereo as @Ken_Griffiths points out) was going to be my next suggestion, you just beat me to it. 

Please keep us posted on if this resolves your audio issues.

@Vosabhoy, are you able to set your TV audio format specifically to Dolby Digital rather than PCM? Previously the TOS link status on your beam was “inactive” which is why i suggested rebooting yoru TV along with checking on the specific audio format.

Most of the issues I’m seeing with home theater audio have to do with the TV not passing the correct codec on to the Beam and then chaos ensues. Whether this is is a purely “local” issue or something tripped by the update and adjustments made in how we are processing the signal, I am not sure.    

Hi, the options are PCM or auto for digital sound out via HDMI ARC. I currently have the setting at auto.

Getting an identical issue on my Samsung TV. Only happens w/sound over HDMI-ARC, not streaming, so it’s not the speaker.  Just noticed it today, everything was peachy until the Sonos 2 update.  HDMI ARC set to PCM.

Diagnostic 1305211937

Same issue here. The beam makes a buzzing and popping sounds intermittently when the TV is off and there is nothing else pushing sound through it.
In my case I noticed it first when I replaced my TV, not the sonos software. Just upgraded my TV to an LG C9 and I’m using eARC for the first time (I was using optical before). Resetting the TV does not do anything to fix it. From the TV’s HDMI ARC options, I can only select PCM, Pass-through, or Auto. The only option that works (produces any sound at all) is PCM, so that is what I selected. eARC is On. 

i just submitted my diagnostics: 700268017

Hello @mgeis 

Thank you for reaching out with your diagnostic number and welcome to the Sonos Community.

I do see that your Sonos set-up does seem to be one speaker short of a 5.0 surround system. 

Can you check to see that both of your rear surround speakers are powered on and within 10-15 feet maximum of your Beam?

Does this audio issue persist if you switch your connection from HDMI/ARC to Optical?

Hello to you too @rixcc 

Since you have an LG tv, can you check to see if you have a “Quick Start+” option in your settings?

To disable Quick Start+ setting on the TV:
Settings -> All Settings -> General -> Quick Start+ (toggle to off)  

If you see this setting and can disable it, does this audio issue persist?

Hello @Vosabhoy,

I’m looking your system diagnostics back over. Your situation is a little bit different since you are using the optical adapter rather than the HDMI/ARC connection. 

Have you checked connection on the optical adapter itself to make sure that it is firmly plugged in on both ends and that the HDMI cable is firmly in the back of your Beam?

Does anything change if you move back over to the HDMI/ARC port rather than the optical connection? 

As I have suggested above, look for the “Quick Start” setting in your LG TV and be aware if your TV has any “Stand-By” or “Sleep Mode” settings that could be signaling to the Sonos Beam. 

Hi, I have disconnected the optical cable adaptor and the beam is connected via the HDMI - ARC.