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I had the new amp installed today and the car does sound 100X better but when I left the shop and went down the street I heard the alternator whining through the speakers. I'm taking it back on Monday to have the shop fix it, my question what would cause this condition? Everything is grounded properly.
 

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Ah the joys of the alternator whine :)

Several reasons, one being like warlord said, your rca's run next to the power cable.

Other reasons: Bad ground cable to amp. Antenna ground leaking into signal ground. Bad ground on alternator to chassis ground, inductive pick-up from cheap RCA cables. Poor power supply design of your head unit, amp, eq or any other device that handles you audio signal, and possibly even a noisy alternator.

75% of the time its low quality (or faulty) RCA cables.

If a shop is doing it they should fix it, if you were on your own they can be very fustrating to get rid off. :)
 

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Depending on the wiring you have, it could be just a cheap'o'. But If you get a RCA filter it will get rid of the whining noise..... the Filter has a male RCA connecter on one side of it, and a female RCA connecter on the other side of the filter... All you have to do is just unplug the RCA wire from the amp and plug the Male end of the filter to the amp, and plug the RCA wire that you just unpluged from the amp to the female end of the Filter... That will stop the whining. :eek:
 
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