Recently I noticed crackling coming through my sub-woofer. I can not hear it when the music plays. But right when I turn my cars power on (key to on) my stereo beeps then while it is loading my cd the sub-woofer has significant crackle. I am sure it is doing it while the music is playing, just cannot hear it. I have completely replaced the amp wiring kit. All wires are hooked up correctly and I have a great ground connection. Just wondering what peoples thoughts are I am pretty sure I have a coil going bad. It still works fine but makes the loud crackling. Thanks for your time.