I do not agree that everything that is audible is measurable. First, we often/usually do not know the connection between measurements and what we hear, although that would probably not trouble Mijo. Second, what about persons that insist that one fuse can sound different from another or that fuses have directionality? I don’t doubt that they hear what they say they hear, but I do doubt that anyone could measure the cause of the phenomenon, except where some boutique fuses do not meet underwriters laboratory specifications for current rating and resistance across the fuse. And if you could measure it with an instrument, you still would not know that the difference in measurement has anything to do with the auditory differences claimed by those who claimed them without doing further tedious experiments . By posting this, I do not wish to start a battle with anyone who is a fuse fan boy. To each his own. I am just using the fuse thing as an example where you may hear something, but it is not necessarily measurable. There are really dozens of such examples I could have chosen.