i have 2 12's in my tour with a 800 watt amp and it doesnt rattle. check for stuff in the spartire well and make sure other stuff isd secure. i also put lots of duct tape on the back of my tage and trimmed it with a box cutter.

98 contour s.e. sport mtx http://www.cardomain.com/memberpage/503352 all mods shown on page