i put 2 6x9's under there in a panel i made sounds good. im thinking of removing the seat bottom and making a box to fit the contours of the floor with the right cu. ft. so i can put my 12 down there then put the pad back.i know it will raise it up a lil bit but i dont sit there.the box i have now is heavy and i would like to get the weight in front of the rear wheels