Sometimes it can be tricky to resolve this problem, but over the years of running an car audio shop, we know the solutions that you can attempt to replicate to fix this common car audio problem. The RCA cables are what carry signal from the car stereo to the amplifier. These are prone to picking up interference, cheap RCA leads are made from cheap wire and usually contain no shielding. The shielding is placed around the RCA positive and negative wires found inside the one length of cable. To describe this to you it is shiny and an foil that goes over the wire within the insulated jacket. This helps stop unwanted engine noise coming into your car speakers and the buzzing coming from an car amp. Upgrading to high quality shielded car audio RCA cables can certainly be an fix to this kind of car audio problem.
Always buy RCA cables from car audio manufacturers that you can trust, brands like stringer and vibe car audio are my personal favourite right now, both brands easy to get hold of in the UK. Another factor to consider is, to run the RCA cable down the separate side opposite to the side were the red thick 12 volt power cable goes into the car amp. Sometimes the power wire can leak out interferences that lines into the engine that can cause buzzing and engine humming noises. If you have used an better set of RCAs and ran them to the separate side and still get interference coming from your car speakers, try finding an better ground for your car amplifier. The best thing to do is find an seat belt bolt as this will be directly mounted on the car's metal chassis. Remove the bolt, use sandpaper to remove any dirt of excess paint before mounting the ground loop terminal onto the bolt found on the black ground wire. Make sure the bolt is nice and tight using an silver manual spanner.
If you have tried the above and still no luck, the best solution is then to use an noise suppressor device, this has an inline filtration circuit that helps out with blocking out noise. You simply connect it inline with RCA cable you are using to feed input signal into the amp. These devices usually work and are only a few pounds via ebay or amazon. They are great in most situations.
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