Quote:
Originally Posted by Hawaiian
Well, The rasp is more of a static noise than a vibration noise. It's almost impossible for me to replicate other than the fact it only happens when I have a device plugged into the USB port, and it only occurs when i drive. I'm guessing it's a bad wire that's causing feedback somewhere.
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Look up ground loop isolators. That should solve your problem. They're cheap and easy to install.
Link
here for example. Don't get one from there, though, those are pretty overpriced. Should give you an idea what to look for though with a good explanation of who/what/why. I'd recommend one for any car audio application.