sounds like a blown speaker

Probably Sonos Support can, if you were to call them. 

Is there a video, or audio, recording of the setup playing these things somewhere uploaded online where we can hear these things ourselves and can you name the track/audio source where we can perhaps try to reproduce.

Is your Sonos setup playing with all default settings? Any Trueplay tuning settings etc? Is it a bonded Home Theatre setup, or is the playback across grouped rooms?

I actually have diagnostic reports and attempts of calling Sonos support both with chat and telephone. I even got to a place where tier one Support acknowledged. They didn’t know what to do and assign myself to tier 2 never got a call back that connected.

Ken-

yes, all settings are set to default and have used true play  on both channels this is happening on: surround and separate pair of 300’s. I can easily identify the sources; Apple Music and Apple TV that I have successfully used before updated without an issue but had not connected any 300’s. While that might have been an issue, it’s happening on movie streams on independent channels.

If you switch the speakers, so what’s now Left channel becomes Right channel, does the problem switch sides? If so it certainly indicates a faulty speaker. 

nik-

that would be a great idea but it’s happening on a beam and 300’s separately and from multi streaming music and or movie tracks too, so while I can switch on the 300’s, obviously not able to  do on the beam. Keep in mind this was not an issue before the update with the beam.

Not sure what you mean here. A separate 300? Or a stereo pair of 300s? Or only when bonded as surrounds? If the last of these are you saying both Beam and a 300? Still can’t see why you can’t set them up as I suggested?

Haha! I have in multiple occasions but tier one support is unable to help and tier two has never successfully returned their forwarded calls after multiple disconnects. 

Other peoples’ threads with similar issues have suggested posting their diagnostics report: 

Here is mine from good morning right have the sequence I repeated twice. 
 

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Moderator edit: diagnostic number recorded and removed

​@CitizenB1,

So it’s all three speakers, playing each/every kind of audio source, is that what you’re saying?

Any chance of you making a video recording and posting it online? - it may go onto help with your support case with Sonos Level-2 engineers, perhaps, particularly alongside a diagnostic submission report too.

My Beam and Era 300’s seem to be okay here - have you suffered any power surges/outages where you are?