there are 3 bolts in the door panel that secure them to the actual door on top of the numerous clips, i would try tightening these bolts and snugging up the speaker screws themselves, this may take care of most of the problems, as for the one behing the seat try snugging thoose screws up making sure that there isnt anything for them to vibrate against (possibly something behind them) there is a large cavity behind the rear speakers. past that dyna mat lol.