I am an amateur radio operator and when I operate on frequencies 4 mHz or below, my arc sounds the Alexa beep and the surround speakers make rapid drumming sounds (this is with the system off). When the system is on, the volume will increase to maximum. This occurs at very low transmitter power (10 watts RF out). I called Sonos support and after about an hour and talking to two different people, they said they had never had this issue and that it was outside their support. Any other hams have this issue? I find no FCC acceptance stickers on the Arc, Sub or Surround speakers. My transmitter is properly grounded (for RF suppression).
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