Power handling of the subs you go to is going to make a big difference in whether you get louder or not. I went from a pair of RF P312s, to a 15" Mojo and got WAY louder. P3s are rated at 500w rms each, but the Mojo is 1500w rms. Had to be very careful not to hit the P3s with too much power. What's more, I definitlely prefer the sound of the 15" over the 12s. Plays stupid deep and and can handle gobs of power. I have a Sundown 1200 on it now but have considered going to the AQ2200. The cone area advice is correct, but big difference in a pair of 12s getting 600w each and a 15 getting 2000w. Either go big 15 or upgrade the 12s.......
