Originally Posted by integralsgreen
i get alot of engine noise comming out of my speakers while my car is running. it makes a a frequwncy noise that gets higher and lower with my rpms (verry anoying especially with a honda). anyone know what causes this or how i could get rid of it? could it be an issue of not having enough power for everything?
What you could try is running whats called a trace ground. Where you run a new ground wire (16 gauge would be fine) from your deck all the way back to your trunk and ground it with the ground for your 4-ch amp. If there is even a 1 volt difference in grounds, you will get engine noise. Make sure the ground for your amp is screwed directly to body metal (ie. trunk floor or floor pan under rear seat, etc.) with the paint scraped away.
I have two amps and an EQ (with inline power filters on the power wires) all running off the factory head unit and I have no engine noise.