well since i have a car i figure that box size would play a role as would the weight of the sub plus weight of box i want something to hit lows very well because from what ive been reading my component set can take care of the higher bass freqs and the sub and component set can meet in the middle for my mid bass i dont like turning my volume past 25 at the most so basically i want a woofer that bangs well between 15 and 25. i want a sub that punches hard which in my opinion would be a hard thud i listen to smooth rap music as well as straight spl rap music. so to sum that up i want a sub that hits harder or just as hard as my 2 l7 12s because thats the measuring stick im using.