Hi, i bought this car and with it camewith 4" front speakers and 2 JBL full range speakers RMS= 150watts. I replaced the HU with a sony xplod that has an output of 52wattsx4, my plan is to power the two full range speakers and buy a subwoofer with RMS 200watts. how much power do i need, do i try to get as close to the RMS values of the speakers or a certain percentage of power is already enough to make the speakers work great? is it possible to use two amps and combine their wattage to power several speakers? thanx!