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I have installed the kit on my f21 and the difference with the previous sound is great. the only thing that I have a problem m, when I don't play music I have a constant buzz that although it is small is annoying. I don't know where the problem is coming from. but I'm thinking that it comes from the Insulate branch A4 cable, what should we do with it? I have it simply disconnected, just like the cables I replace with those of the kit in the door frames. Should I put electrical tape on them? Regards, and thank you very much
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