I want to get the Pioneer Premier 12'' Shallow Mount once I get some money together. I've looked around and I figure I need a 700 watt amp @ ??? ohms?? The Subs are rated for 1400 watts @ 4 ohms. I think. I also need a box to fit behhind my seat and i'd rather just buy one rather than building one. It would have to be around 3'' at the top and like 7'' at the bottom with chambers probably around .85 for each side. I have a bench seat and I wanna keep the seats all the way back. any thoughts.