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Originally Posted by Sensei Kreese
Changed out my factory HU to an Alpine W927HD, 7 inch touch screen. Instant alternator whine and the speakers sound like they are about to blow up. Wish I would have read this before I changed the HU and would have replaced the speakers at the same time. I've tried messing with the crossover, have downloaded what the exact specs should be and put it in the HU, still sounds like crap. It's embarrassing if I turn up the volume. Snap, crackle, pop.
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Did you ground your bose amp wire from the harness to the same place as your head unit? Is the ground a clean solid ground? This usually is the main cause.