So i've had my EMP system hooked up for about 4 days now, and have noticed that the sub box is rattling pretty good. I've determined that it is coming from the back panel as i can put pressure on it with my hand and the rattling will go away. I took my screw driver to the panel to make sure everything was tight and found that in the bottom corner there is a screw that will not tighten, it will just spin freely. Anyone got a solution for this? or should i just send it back as a defective sub?