Here's the lowdown: I have two Orion XTR124D 12"s in a ported box and they're rated at 600w rms each. The amp I have is a planet audio AC4000.1D which handles 750w@ 4ohms (which is way under the combined sub rms of 1200w) but on the other hand, the amps output at 2ohms is 1500w which is just a tad higher than the previously stated 1200. The subs are usually run at near full volume as I host football tailgates and built the system specifically for that. With that being said, sinc I'm running near max volume for longer periods of time, should I be running the subs at 750w rms or 1500? Thanks.