XcompX

Okay, I've seen a few people ask questions regarding this extremely frustrating problem. Alternator noise, or ground loop interference. This is easily fixed.

I found this site, seems to give the solution simply:
Proper Wiring

Amp Power Wiring

Hope this helps

MP3Car.com

 

VitalRyan

Lol... it's NOT easily fixed ... you can try to avoid it, but sometimes it just happens, it can be components, anything.

In my setup, I get the interference from everything, I have no idea why, my computer emits noise on it's audio cables, the head unit emits noise, etc... I had to use a total of 6 ground loop isolators to fix the issue, cut the noise right out. Nothing to do with wiring, **** happens and you gotta fix it.

HappyPills

I could fix everyones problem with noise if I was good at explaining things. I'm the type of person who has to be the one fixing it to fix it.

Out of the entire time I installed car audio I never had a problem with noise.

50% of the noise is from the installation and the other 50% is from ****ty cables.

TheLlama

Mine was actually poor factory wiring. I replaced the speaker cables and wired my own power to my amps before I even heard what the system sounded like. I had noise afterwords and it was the ground to my head unit. Took forever to track down, stupid factory.

MP3Car.com