Okay Im gonna post a question and hopefully I dont get a lot of "use the search button" responses lol... I tried

If I want a 12 inch sub in my car, (08 acura TL) what would be the best setup for sound? Would it sound better in a box?

How about the set up on the #6 post on this thread ---- http://www.acura-cl.com/forums/showthread.php?t=720022

would it sound good like that without a box?
I am pretty much looking for something that would sound good (no rattles either) and still give me trunk space. Thanks guys