Hi, my name is Hans and I have a question.
My system is Beam with 2x Era300
When i play TuneIn radiostations then there is very often a short beep around 7 kHz when the music plays in that range.
It seems like a feedback error, as if an microphone is to nearby speakers.
This is my 3th installation and also complete reset to default, on different locations and wifi networks with different speeds and internet providers.
Its started directly after first installation (a few months ago when i bought this system).
It seems to me it has to do with sample rate of radiostations or the Sonos system, but its very annoying.
Is there anyone who is familiar with this problem?
Or is it my lack of experience with Sonos ??? 
Hope you have an solution.