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<blockquote data-quote="mikescanlon" data-source="post: 1153084" data-attributes="member: 562799">that is alternator whine, it&#039;s cause by alot of little bad things going wrong.you can take the RCA&#039;s outter barrel that goes to the 4 channel&nbsp; and ground it out with a piece of wire and the noise 9 times out of ten will go away.if that doesn&#039;t work, you can buy a ground loop eliminator, but those things rarely work compared to grounding out the RCA negitive.you could also check your grounds on your new amp, your old amp and your headunit to make sure everything is grounded to bare metal on the car&#039;s chassis system.grounding your battery negitive terminal to the chassiss in 4 or 0 gauge never hurts either.if you have really cheap RCA&#039;s(like walmart brand) this problem can come from running the RCA&#039;s too close to the power cable, but if you have anything &#039;shielded&#039; that problem wont exist.i hope some of these solutions help, let me know, there&#039;s more things you can do, but those solutions should solve your problem, and i&#039;d suggest doing them in that order&nbsp; : )</blockquote>

[QUOTE="mikescanlon, post: 1153084, member: 562799"] that is alternator whine, it's cause by alot of little bad things going wrong. you can take the RCA's outter barrel that goes to the 4 channel and ground it out with a piece of wire and the noise 9 times out of ten will go away. if that doesn't work, you can buy a ground loop eliminator, but those things rarely work compared to grounding out the RCA negitive. you could also check your grounds on your new amp, your old amp and your headunit to make sure everything is grounded to bare metal on the car's chassis system. grounding your battery negitive terminal to the chassiss in 4 or 0 gauge never hurts either. if you have really cheap RCA's(like walmart brand) this problem can come from running the RCA's too close to the power cable, but if you have anything 'shielded' that problem wont exist. i hope some of these solutions help, let me know, there's more things you can do, but those solutions should solve your problem, and i'd suggest doing them in that order : ) [/QUOTE]

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