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High pitch hum from rear speakers

David T May 26, 2018

  1. David T

    David T New Member

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    hi all. I’ve recently changed the front speakers in my 2004 b6 a4, which has concert with half amplified rear speakers and subwoofer. I also replaced the headunit with an alpine cde178. Since being installed there is now a high pitched hum from the rears, the tweeters I think. The noise does not vary with engine speed or volume, it is constant when the headunit is on, whatever the source. Has anyone come across this? Is there a problem with upgrading front speakers if they are rated higher than the old ones? Any ideas would be appreciated. Thanks
     
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  3. perry30sport

    perry30sport Active Member

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    its nothing to do with the front speakers. it will most likely be the active adaptor that you have used to keep the active rear end still working. I have sen it a lot on a3's. what make did you use?
     

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