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There’s a buzzing noise coming from my Sonos Amp, any idea what it might be?

https://youtube.com/shorts/1UXykGnOiC0?feature=share

You have nothing plugged into the line-ins, the noise comes from the amp, and it’s higher than 60 Hz.  Sounds like a coil whine to me.  Assuming it’s under warranty, you should submit an RMA. If it’s not, you could attempt to repair it yourself.  You would need to disassemble the amp.