im running an audiobahn amp that is providing 1200W RMS to my DVC boss 10" subs... and it does go veeery nice inside the car

however, when you're outside, and regardless of whether the boot is open or closed i get massive rattles pretty much everywhere, it just changes the rattle when it's open or closed
whats the easiest and cheapest (im a uni student) way to get rid of those annoying rattles?
cheers