you'd get a fair amount more of performance if you made a larger box for your SE 12's.. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifOriginally posted by Miller alright...last question, How much louder on average do you think 2 15's are over 2 12's????noticeablly (12" SE's vs. 15" SE's). box obviously bigger with the 15's...thanks