It has more to do with power, or Wattage, where, Watts = Volts*Amps. The Factors have regulators that can handle 9-12 V. of input. The orginal supplies were 9 Volts, 1200 milliamps, whereas the powerfactor delivers 12Volts, 400 milliamps. The orginal supplies were a bit over-spec'd on what they could deliver too. Most of the demand for current is on powerup, and the specs are fine for MIDI (we've checked).
