Let's talk power cords

@atmosphere-thinking more about the diode effect analogous to a fuzz pedal, what if the effect was much more subtle than a fuzz pedal yet still perceptible to the human auditory system?  Possible? Could it be measured, and if not with current technology, still be audible?  This is the part that I find truly fascinating: that we may be able to hear very subtle differences that we have yet to measure accurately enough or even account for.