you get what you pay for thats why JL stuff costs so much and JL hits like a ***** with the best sound quality out there well the 15 fi q is strictly spl but personally i think the 13w7 sounds alot better and hits just as hard easily
you could do 18" btls for about 400-500 ea shipped they run at 2000 watts rms at 1 ohm so there strictly spl but they hit hard and best bet if you want spl.