hey, i was going to get the earhquake ph5000w amp but i heard theres a bigger one, i checked it out and theres a earthquake ph10000w2 so i looked at the specs, and it has the same RMS wattage except it says somthing like when its linked its 10000 watts rms? and it has a built in X over or sumpthing....im not sure and its only a bit more then the phd5000w which should i get?