OK so im wanting to buy two 12" L7 kickers but i dont know if i should buy the dual 2 or dual 4,which one will sound and pound better,i dont know if this matters but i only have one amp right now,and the subs will go into a nice ported box,i am wanting to get another amp but not for another couple months what should i get the dual 2 or 4 for best results??? Thanks