As the title says, my speakers pop and get static when I use the brakes, the turn signal, the air conditioner, the window switch, the trunk release, YOU NAME IT.

A little about my audio set-up:
I have aftermarket door and rear deck speakers, front speakers amped at 75W RMS per speaker. The ground for that amp is the front seat bolt.

I have 2 12" MTX Thunder 8500 series subwoofers in the trunk amped by a Rockford Fosgate 2000W RMS amp. This amp is grounded to the trunk by a grounding block.

I know you guys are mostly auto/engine guys but SOMEBODY has to know something about the electric system in this car.

The battery is a (1) year old Interstate battery, the alternator was replaced last year.

 

clean ALL ground points that you can get to...engine bay, interior...especially the amp ground in the front seat bolt.

You're getting interference, and one of the easiest ways to get interference is with a poor grounding plane.



Did it ever work properly? And if so, what changed from then until now?

 

Yeah it worked great for the first few months that I had the amp installed, but it slowly progressed from having a little underlying static in the front passenger speaker, to having that speaker cut out at low volume, to both speakers only playing clear sound when the volume is cranked. The speakers cut out unless the volume is really loud.