I would wire the coils in series and then the subs in parallel. I personally like doing this because then both the subs have direct access to the amp for its power, and not having to go through the other sub to get power. Its really a personal preference. I know other people that like to have their subs in series because if one sub blows, then it saves the other sub by cutting the power to it. Just some stuff to consider when you deside.