I just got one of these amps from a friend and im running 2 mtx 15'' subs on it and it does not seem to have much balls. The subs are only rated for 150 watts and there 4 ohm so wouldnt that make the amp push more power? Im not sure it may be the enclosure( sealed 3.5 cubic feet ) But im not running a sub cable cuz i have not had a chance to buy one yet so im useing a rca does this make a difference???