so i have an Acura MDX and i want to put a single 12" sub in it. the car already has a stock sub in it, so my question is, how do i put an aftermarket box in? can i remove the speaker and run its wires to the new amp? if the car has an amp for the sun that it there, can i disconnect that and use its input wires on the new amp? im lookn at a 300watt system.