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      02-14-2016, 01:24 PM   #21
f_veloso
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Drives: E87
Join Date: Feb 2016
Location: Portugal

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I know this thread is old but as anyone been able to solve this problem ? I have the alpine retrofit kit on an E87 with the m-ask unit SA606 and I have this hiss from the speakers driven by the alpine amp even with the head unit coded to hifi alpine, which supposedly slightly decrease the gain and de-EQ the head unit signal. I know the problem resides in the head unit signal because my rear speakers also had that same hiss (although in a much lower level, I had to put my ear close to the speaker to hear the hiss)when the car was coded to stereo, know that is coded to hifi alpine I canīt hear the hiss from the rear speakers but I still can hear the hiss from the speakers driven by the alpine amp.