I'm from Portugal, so sorry about any spelling mistakes or bad English...
I was running a Kenwood receiver and 4 Alpine speakers om my car,
everything was fine until I decided to install an Alpine Amp and a Subwoofer.
Now, (and I'm sure it comes from the amp, because before that I had no noise),
I have a noise that sounds like a miniature siren that rises in pitch with the speed
of the engine. It's not to loud, but it sure anoyes me!
What should it be the problem? Poor ground? Running a 12V power wire near
the rca's? What?
And what can I do to shut down this noise?