I posted about this earlier, but now I have a different problem. I'm using a JL 500/5 amp, which is pretty heavy. It's currently mounted on the back of the rear seats. The problem is that the back of those seats is like cardboard, and the amp is too heavy, so the screws wont stay in...any suggestions?

 

What i did to mount my amp was make a false floor on the trunk in the back 2 feet or so and mount it flush under there. It looks really nice and you only looks 2" or so of trunk depth in the back. I aslo put hinges on the floorboard so i could still have access to the spare.

 

if you want to stick with the back of the seat try the wall anchors for the sheetrock in your house walls should hold the amp

 

What I'm thinking about is creating a false back to the back seats, out of some sort of fiberboard, light wood, etc. That would mean that the seats wouldn't fold down separately, but they're not doing that now with the length of the amp anyway. I would use the steel frame around the edge of the seats to secure the back, then mount the amp onto that....