at low volumes, i can hear static. when i rev my car, the static ticks faster. what should i be checking? i think i should recheck the ground wire to the stereo. i noticed it after i had my timing belt and water pump replaced, but i don't think that has anything to do with the stereo. btw, the stereo is an alpine cda-9835 and the car is a 91 honda accord. thanks guys.