if your h.u has the option then try lowering the hpf for all 4. preferably have the 6x9's set at a lower hpf point than the fronts too. dont have it set too low for either tho or you'll run a risk if you like to play your music loud..

seems odd that youre aiming for the stock fd system mark.. more weird that you took out the sub&amp, saying you didnt feel the need for them but then ask how u can get more bass..

i rkn put em back in, you dont need a false floor, just a way of securing the subbox down. if you need the bootspace for baby pushers or groceries or whatnot then forget what i said.