I don't know if anyone posted this before but I found another thing for our cars at Home Depot. I was walking through getting stuff for my trunk that I'm redoing, and found it by the spray paints. It's a multi-purpose rubber coating for like tools and stuff. Well, I picked it up and started reading it and it lists all these different uses. Sound deadening was one of them. I had to test it. I had an extra box from my old speakers, so I painted the stuff on and let it sit for like 4 hours to dry. Then I hooked them up, and My God, what a difference. I think I'm gonna do my whole trunk with it while I customize. If anyone has any questions about this stuff, let me know.