9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
After 5 months, new 6.5" speakers, 2 different amp1 units, and new EHU, I finally figured out what the problem with my door speakers were. It hit me after I had 2 different amps giving the EXACT same 'popping noise' in the door speakers. Turns out there was something wrong with the wires going...