i am new to subs and amps and i was wondering whats the difference between a 4 ohm dual voice coil subwoofer and a 2 ohm dual voice coil over besides the wiring configuration. i ask this question because i am going to buy either a kicker s12l5 4ohm dvc or a s12l7 2ohm dvc but i don't know the real difference. any answers are appreciated.