So I have my amp has my 2 6x9s and a small bass cannon running through it and i had the stereo since February and there was no problem. but the other day i was driving and my sub crackled a bit and then the whole amp shut off. so i went on my deck and shut off the sub and then tried playing the stereo again and the amp doesn't shut off. so does this mean my sub is shot or i gotta check the ground or what? Appreciate it. Ryan