ctviggen - That's why I told jtwrace that it was a tedious and time consuming work. You are dead wrong in even implying that a square wave is not a true representation of real life music/signal... What does that even have to do with anything? This is to test current limiting. Using a square wave, or testing high frequencies makes it easier to see the effects that the Zero Surge unit will have on a power amplifier. If the square wave, or high frequencies look better without the Zero Surge unit, then case closed, it limits current. It will limit current all the same, weather you test with square waves, high frequencies, or music.
What's most depressing here and sad is that everyone fails to see that the Zero Surge has a series inductor. Any time there is an inductive element, it's slow to react to short impulses. This is extremely common sense, yet jtwrace wants someone to conduct this nonsensical experiment. For what? If you know even the most basic electronics, then you know an inductor is current limiting.
