It is how you design the box to work with the vehicle so you don't be fighting to gain 1-2 db at a time remember the loudest guy in the world done it with one 15
Wanting to build the loudest musical jeep cherokee also seen that new EMF subs and would like to see what's the max you can put on them before they give up
hey rusty have u figure out what the RMS of the 8m3 going to be will it be a contender for new 2500 dd 8 but the sub looks great would like to get 4 when u start selling them