sharmask

I removed my headunit and connected a wire to one of the rca's and earthed it onto the headunit. This has cut down the interferance a lot. (I was getting a lot of interferance and the more i revved the car, the more interferance i would get). However there is very little interferance now. Is it ok to do this or is it dangerous?

And the very small amount of interferance, is it actually just supposed to be there? There is an electrical sort of buzz noise which comes through the speakers when the car is switched on and then when the key is pull out. Is this normal?

B5S4_Oz

Make sure you only earth the common ground lead from your rca's to your h/u. Anything else and you could do damage to your audio system.

sharmask

What do you mean by the common ground lead from the rca's??

Its earthed from one of the rca connectors.

avincar

RCA's have two center pins which are +, one L, one R. Then there are two outer shield rings. These are grounded.

Since they are both grounded, they are connected together, or in electrical parlance, "common".

We HOPE that's what you are grounding with your setup.

Usually, grounding like this is only a test to verify that a ground loop is indeed the problem or part of the problem. Since it does so verify, you have a ground loop.

I've posted an explanation of how to approach this problem several times and I don't see that it is helping you, so I hope you figure it out, but I'm taking a break on this one. Good luck.