thing is the subs need to be around 500watts rms for 4 12's and around 1000watts rms for 2 15's
if u decide on going with 4 12's go with DC lvl 3's, RE SE's, DD 1512's
if u decide 2 go with 2 15's then id go with DC Lvl 4's, Fi Q's or BL's, DD 3515's