OK, Well I have tried a few things and nothing worked. But first I will tell you my situation. I have a 92 Ford Ranger xlt and a FI BL 15 in THIS Box with a Pyle Audio 2200 amp. My problem is that When the box and sub are in the cab of my truck and the head unit is off or on it doesn't matter. I receive a very loud buzzing sound when I turn the key on. Here is a video below to explain what happened. http://www.youtube.com/watch?v=4JuZPgoYyYk Please help me as much as you guys can.