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<blockquote data-quote="forbidden" data-source="post: 601755" data-attributes="member: 552189">I was going to guess that you had a PIoneer head unit, no BS. Pioneer has notoriously poor internal ground planes that can result in a breeding ground for noise. Most head units are made for the people that will never use them with an amp or amps, thus no noise is ever heard as there is no difference in ground potentials. My guess is that you have a major difference in ground potentials between the amp and the cd player. Check the grounds on both. Remove the cd player from the dash and ground it to the amplifier. Make sure the cd player does not have the antenna plugged in and is not touching metal of any kind (gearshift for example or keys). Do you still have noise.The amp ground is highly important. It needs to be clean and as low a resistance reading as possible. There is a thread started just above / below this one that you should read about grounding. It will give you some good info. With multiple amplifiers the chance of a difference in ground potentials is that much higher, with a sigle 6channel amp, I am immediately drawn to the good ol&#039; Pioneer and it&#039;s known ground plane issue and the ground of the amplifier.</blockquote>

[QUOTE="forbidden, post: 601755, member: 552189"] I was going to guess that you had a PIoneer head unit, no BS. Pioneer has notoriously poor internal ground planes that can result in a breeding ground for noise. Most head units are made for the people that will never use them with an amp or amps, thus no noise is ever heard as there is no difference in ground potentials. My guess is that you have a major difference in ground potentials between the amp and the cd player. Check the grounds on both. Remove the cd player from the dash and ground it to the amplifier. Make sure the cd player does not have the antenna plugged in and is not touching metal of any kind (gearshift for example or keys). Do you still have noise. The amp ground is highly important. It needs to be clean and as low a resistance reading as possible. There is a thread started just above / below this one that you should read about grounding. It will give you some good info. With multiple amplifiers the chance of a difference in ground potentials is that much higher, with a sigle 6channel amp, I am immediately drawn to the good ol' Pioneer and it's known ground plane issue and the ground of the amplifier. [/QUOTE]

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