I am considering an ext. cab for my tnt, and am wondering if I would be better off with a 2x10 or a 2x12... or whatever. I need more bottom end. I'm going to go avatar... So, the TNT is 150w at 4ohms, then 200w with an ext. 4ohm cab... so that is like 200w at 2ohms(?) Also, if you have a better suggestion, tell me.