Noise grrrr, Sound system noise Options

[insec7]

Ok I got a weird problem that I cant crack. I hear this annoying noise out of my speakers wevery time the car is turned on, the pitch of the noise increases as I rev but it doesnt get louder.
Now I know improper ground causes this to happen, but I know I did ground my head unit properly so the other day I did a little test.


So I took out my head unit, and disconnected the ground from the chasis, but the head unit did not turn off, there was absolutely no change in sound/performance of it.
Then I started disconnecting other cables to figure out what grounding it. Finally when I unplugged the antenna cable, the headunit stopped working, this made me go WTF because it just doesnt make sense (to me anyway) So its obvious that the antenna is causing the noise because it serves as the ground.

Does anyone have any experience with this? Any tips/pointers would be greatly appreciated.

Thanks in advance.

[brento_bot]

Firstly, what head unit are you using, because certain brands of head units have a poor ground plane. meaning the ground inside the unit is poor, so no matter how good the ground you have wired to the ground wire, it wil still produce the whine. A ground loop isolator is a band aid solution, it will not fix the problem it will disguise it. And you will loose sound quality.

I had terrible whine in my 4 amp system for ages, not being able to fix it. Until one day i read about the poor ground plane in Pioneer head units. So what i did was, I undid one of the screws in the back of the head unit, attached some wire to it, then attached the other end to the outer metal of the RCA wire plugged into the head unit, and alas sound gone. It worked for me, could work for you.

Hope this makes sense, hope it helps