Have a 2002 a4, non Bose with an aftermarket jvc head unit (I purchased the car this way) When I start the car the rear speakers (subwoofer im guessing) makes a popping sound, then there is this electrical noise coming from the rear speakers (as if standing next to a powerbox in the front yard for underground powerlines zzzzzzz) even if I turn the radio off. then when I step on the gas I hear this high pitch whining noise from the speakers(volume of that noise increases with rpm). Then when I turn on the headlights and fogs that electrical noise gets 3x as loud. anyone?

 

Youre Screwed!!!

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JK dude... cant say I hve had this problem in my 2000 a4 2.8

 

yeah, I just putan oem head unit and all is well. I hate having a ton of cds in my car some im just gonna wire up the ipod adapter and call it a day.

 

it is the ground system the audi has, mine dose it too, i was told adding a groung kit can help resolve the problebut i hardly notice it.