Help with car audio problems in a ford focus?

Question

Why do i keep hearing my doorlocks through my subwoofers.

Answer 1

you might have ran a wire near  or 2 close to the door locks. I had this problem with my breaks.. when i press on the breaks it would create noise in my speakers I moved my speaker wires away from the break pedal wires an it fixed it.

Answer 2

You've probably got your RCA's ran too close to another wire try running them in a different route.