Such refreshing honesty. If a device really does sound or measure differently with a different power cable, it probably has a poorly designed or defective power supply. A well engineered power supply is robust and filtered so that it isolates the device from typical power line variations. So long as the power cable is thick enough to pass the current the device needs with minimal resistance and heat, and grounding is properly wired, it should make no difference. Think of all the cables the power travels though before reaching your wall socket. Miles of high voltage lines, transformers, etc. None of it is fancy audiophile cabling, it is simple copper wire sized for the application and properly grounded. Then after traveling through miles of all this stuff, somehow the last 12 inches of wire before it reaches the device makes a difference? It would be an understatement to say that is implausible.