Magnifi mini speaker high pitched squeal

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I have a problem in that my speaker will just start squealing a high pitch squeal when the system is in use. The only time I can stop it is when I unplug it. It will not turn off with the remote nor the off button on the speaker. I enjoy this system however the squeal is deafening. I worry it will start squealing when I’m in the next room and upset my neighbors.

This is a perfect system for condo life so I hope Polk can help me please.

Thank you

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