Ive had 6 different two 18 setups before. They got quite loud. 155+i'm sure some have loud 18 setups but haven't u noticed alot of systems with 18's are no louder than ones with 12's or 15's? i mean u were at like 157 with 8 12 seen peeps with 4 18's only do 153 (may just be because of wall/install but still) what about the fu 1200 the mms on that says it's very light u could do 10 of those.. or 20 of the 300's or pioneer 3004 lol.. saw a van with 50 sony subs many years ago only did 153 i wasn't impressed, point is sometimes less is better..