The other day i was washing my lude and had the trunk open and i noticed that when i turned my subs up louder the actual sub rattled, its not loose or anything but somthing is rattling. They sound fine in the car and they arnt blown i dont think they still produce the sound fine but theres just the rattling. any idea what it might be???? thanks

 

Maybe the box?? maybe a little air escaping through the screw holes in the box??? Im not sure...its really hard to pinpoint with not being able to hear it