Come on now... Use some common sense here. //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gifi was going to go with a pair of 18" but what do they sound like compaired to a 15" of same power so i guess my ? is 15" or 18" but i have heard that on 18"subs you dont get alot of in car sound compared to say 12's or 15's