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Speakers hum

Electrical and Electronic

Model: Boxster, Year:2009, Mileage:1800, Type of use:Street use only
I have a 2009 Boxster with the sound package plus and base radio receiver. Whenever the cars running or the auxiliary powers going, the speakers make a humming sound regardless if the radios on or off. My local dealership had no 09 or 10 Boxster with the same receiver and speaker combination, but none of their other Porsches made that humming noise all of the time. Is this normal a 2009 with the base receiver and sound package plus?

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