Pop open your trunk with your subs very loud and you'll see 2 rubber stoppers up where the trunk creases. IF you don't know what I mean, when you take the trunk covering part itself, it's shaped like an L, the rubber stoppers are on the point of the L, the crease, one is on the far left, the other on the far right....Just twist them around and play with them till you have the least rattle possible.