ok see i need to know what is louder 4 8's or 3'10's the subs are ma audio xe subwoofers 20-800fz. sealed or ported box dont matter it will be in a single cab truck so wich will be louder and have better spl and soundqaulity?
If you have the same power running to the 4 8" and the 3 10" the 10s will be a little lounder due to a greater surface area. (less than a 3 db increase) Since a 3 db increase is the lowest detectable sound change you probably would not be able to tell a difference in volume. Between the 2 setup the 10s would extend to lower frequencies which is desirable.