This happened to me the first time I got a sub setup for my truck, I bought and installed all the stuff myself, the amp was too weak (nobody told me to get one with a higher rating than the sub, especially if you're buying a crap one, also nobody told me Jensen was crap amp) basically I didn't study up on it enough. I don't know what your particular problem is, but I turned my gain down and it mostly took care of it. Every once in a while, I would have to shut everything off and back on for some reason, I probably had something hooked up improperly. Tell us what your setup is, and how you have everything wired.