hey everyone. well i have a friend that me and him go back and forth on competing in speakers likes who's has better bass mostly. today he bought 2 pro studio speakers that have 2 15 inch subs in them. that's 4 15 inch subs together. they are like dj speakers. and he is only using a receiver that pushes out 400 watts. i have a Sony 12 inch powered sub that's it and so far I've been beating him until now. what the heck can i get to beat him that's not costly cause his speakers were only 100 and they are about 70 pounds and HUGE!!!!!! PLEASE HELP.