The problem is you need to match the HU output(volts) with the amp gain input.If the HU puts out 2volts max, then you set your amp to accept 2volts. Any less(which means turning the setting towards max) would result in possible clipping of the amp and signal.While the wattage would be the same the signal would be clipped. well, thats my understanding at least. either i get schooled or i get confirmation...