Originally Posted by Xpress
Sounds like that speaker may be grounding out somewhere, or the plugs on the back are shorting. Simplest thing you can do is unplug the speaker and the noise will go away entirely..
No.. it is not the speaker..if it was grounding out, you would get very little (if any) sound from the speaker.
I get a similiar issue with my after market stereo and stock infinity amp. Sometimes I get a constant electrical noise that comes on with the headlights, but it is not alternator whine that varies with RPM..I have not had it for a couple of months now, but it will return again whenever it feels like it.
I have a filter to put on the 12v main going into the stereo, but I have not been motivated since the noise is not currently present.