My friend recently got a 15" Power Akoustik PW2 for free and he built a sealed box for it and I already have a 10" Kicker L5 in a sealed box. I was wondering which one is better overall? The box that he has now is too big for my trunk and he was thinking about making a smaller box (he doesn't have a car....) so it will fit in my trunk. I'm skeptical on which one to choose and don't want to make a whole new box just to put a crappy sounding sub. in my car.