ok right now i got a planet audio high current amp. it is kinda a cheater amp it is rated like 25 times 2 at 4 ohms but it is doubled every time and can go down to a quater ohm load.... and i want to purchase a planet audio 18 inch fu sub... i know i will not be able to give it enough power but for now it will work. i was just wondering if i will need a dry cell or bigger altinator or anything to help this out. any suggestions would be great