First, if the article were correct then the voltage drop would be observable via measurement at the equipment end of the cord. Second, competently designed consumer devices are carefully made to work with a variety of input line voltages simply because the voltage presented at the service entrance itself can vary by more than 10 volts.
Snake. Oil.
Originally posted by Videodrome:
As for determining my results, that's simple: listening. My ears are the final arbiter of the sonic differences between components ....
That's entirely reasonable as long as it's a proper double blind test, the results are statistically significant, and it is repeatable. Harmon Intl. uses a system a lot like this and gets valuable information this way.