I know the guys on this forum will rip hard on me for this one but try 3 SSL CR4000.1's they are the best bang for the buck out there if thats what your lookin for. They are not sundown of coarse but they are far from junk. I have used one on a old BTL 15 and did a 145 off only 2300 watts. Only downfall is no subsonic filter and only 4 gauge inputs. http://www.youtube.com/watch?v=fU3nZ-l4vxg here is a vid