Odd Buzzing noise coming from speakers

[JeffM 10+ year member]

I have had my system installed for 2 months now, and have not had a problem until now. A friend was getttin in the passenger seat, and when the door opened, a loud buzzing noise came over the speakers. Turning the volume down on the headunit had no effect on the noise. I then tried to find out what was causing it. The noise only occurs when the front passenger door is opened up all the way. Anyone know why this would be happening?

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