Originally Posted by XS Steve

First off, you have all good equipment. Noise enters through your rca's in most cases. When running four channel amp's, placing your wires is very important. If you ran your rca's and power down opposite sides of the car your on the right track. When running rca's, I tape all three neatly together(front,rear,and sub). The reason is noise is picked up between the positive(center wire) and negetive(out side wire that looks like shielding)wire. When you only run one rca's, the noise you pick up is very low, but when you run two or three(in your case) rca's you have three positives and three negatives. The more space between your rca's the more noise you pick up. When I put mine together I tape the rca's 6 to 8 inches from the cd player to 6 to 8 inches from the four channel amp. You have to have a longer sub rca, so you can run it over to your sub amp. There are also better rca's you can buy called(twisted pairs). They are designed to cancel noise and any good stereo shop should have them in stock. Even if I use them I still tape them together. When running the rca's to the back of the car, keep them on the oposite side of the car from the power wire and away from any factory harnesses. Try to avoid power wires at all costs, but if no other way you have to cross a power wire, cross it at a 90 degree angle. That covers the rca's. If you do this there should be no reason to put any filter in, besides filters are just bandaids. They do not get rid of noise. There are a couple of other ways noise can get in. If the four channel amp is screw down to the body of the car you may be getting a ground loop there. Unscrew both amp to check this. If they are screwed into a box or any wood piece(making sure the screws don't go through the wood and touch metal) they should be alright. Now when fusing ampifiers, less is always best. Fuses are resistors that drop voltage, and the more that are in line on the way to your amp, they can cause the amp to pick up noise. The reason is there will be a difference in voltage from the cd player to the ampifier. It gets worse with more components(eq's, crossovers, line drivers, etc.). So when fusing, put the right fuse for the amplifiers at the battery. Do not use fuse block in the back, if you have to divide the power wire use powerblocks, or better yet a cap. Now with grounds on the ampilifers make sure they are tight and not anywhere that they can rust. One more thing to check is to see if your cd player is grounded properly. Take the player out of the dash and unhook the antenna. If the cd still powers up, your ground should be good. Last thing is setting the amplifiers properly. Turn all your gains on the amplifier right down, then set the cd players(bass, treble, loud,eq's)settings to flat or off. Next turn your decks volume full out, then back it off 2 or 3 digits. That's where your deck should be set to, now slowly turn the gains for front then rear up slowly making sure the sound is clean. After set your sub level. You should be done. Hope that helps you out.

Originally Posted by Haunz

You have a ground loop...

in some cases if there is a fault in the decks signal ground return hooking the signal ground of the RCAs directly to chassis ground can solve the problem.... IIRC this is most common with pioneer decks......

Originally Posted by Kaiser

I like that but how do you charge it? Not with the alternator...right

Originally Posted by hott-nix

how do you do that? just wrap a wire around the rca connector and ground it off somewhere?