Thread: Another yet speaker noise problem, not sure if it's ground loop

Well that confirms that you will need some sort of switch. And I still think a transistor will be your best bet.

Either that or just throw in a manual switch to "un-plug/plug-in" your input.

I have the same problem. I am using an external soundcard. While the pc is booting I get alternator whining/buzzing/clicking until windows starts.

I have a switch to keep the amp off until Windows start but it is still a PITA. What about grounding the external soundcard or PC?

Is there an RCA off switch?

Originally Posted by ArcaneDreams

Well, your first test would be to unhook the auxiliary input, and see if you still have the noise.

If the noise goes away then this method should work.

I tried it today and the noise disappeared, so you were right. I'll try to do this mod as you said, thanks.

Instead of making a new thread I decided to bring up this one...
OK, so, it's been a few months since I took off the head unit, upgraded carpc, installed amp, sub etc.
But...
I still cannot get rid of that buzzing noise. I tried ground loop isolator - the noise became even louder. I tried to ground the RCA negative to the chassis - didn't help.
It's definitely pc sound card gives this problem because once I unplug rca from pc, the noise disappears. Oh yeah, it's built in sound card and connected to the amp thru 3.5mm to RCA Y-adapter. The pc powered thru inverter and inverter is grounded. However when I power pc from outside there is no noise...
Any help appreciated.