one more thing about the brands. ive heard lots of different kinds. Perhaps there are better subs than JL. I know there are louder ones. ive heard 2 kicker solo x 18,s running on 5000 watts each. ive heard rockford fosgate. ive heard pioneer subs. JL just sounded the clearest to me and in the ported box specially designed by JL auido, it was an amazing 13 inch sub. but although i want SPL, i want to maintain some sound quality as well. I plan on deadening the whole vehicle. think of money not being an issue. because im sort of nuts with trucks and audio and i dump lots of money into it. however, i am smart so help me out bros