ok so right now im building a wall(as some my have seen from befor) well im thinking about getting 2 more subs so ill 3 yea they are not expensive but i like them but i was going to get 2 more sony xplods 1300 watt per plus my alread 1200 watt but i was wondering what i should get to push it? like 1 more ampp or 2 more and what kinda battery source would i need to push all of it?

If you are using Sony subs, hard to tell from your typing, use a potatoe to power them.

Seriously, get better subs. You can get better subs for $50 each.