fast shipping got 2 of these n 4 dayz, hooked em up easily with the single 4ohm. sound great only had the bass gain 1/4 up. and u can tell these subs can bang. had the RF r2d2-12 previously and they blew n 2 dayz with the gain halfway. i will take my time breaking these in. (my first system i had the mtx 10's and they beat pretty good for about 3 years.) so i figured why not get the 12's.