Ok here's the deal I have a dc lvl 4 XL 15 right now that's d2 on my aq 2200.. I planned on salin the dc and gettin 2 of em that r d4 then I had a offer today to trade my sub and amp for the newer re xxx 18 and $350 for a re m2d2 amp he has also. I want to b n the high 40's or n the 50's. I hit a 145 at 38hz with my setup. Lemme get some opinions. Thanks