i currently have a hsu vtf-15h sub. it sounds fantastic, but when i really want to crank it up my drop ceiling is vibrating. i dont think the tiles are vibrating, i think its the frame. but last night i put 2ft 2x4's on each of the tiles to weigh down the frame. but i am still getting vibrations. since the tiles are the cheap 1/2 inch fiberglass could they be the ones vibrating? or can i use some rubber cement on the ends where the frame meets the parimeter? also dont they make clips for the tiles?