How many are you going to run?
In 11 cubes, with 2 18's...I may be wrong, but after port displacement and subwoofer displacement, I don't think you'd have enough cubes to play 2 18's correctly. You'd be choking them a bit, I think?
I'd go for the 15's...Still get stupid loud and don't require as much space to do it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif