New Synergistic Master Fuse

If you replace a blown fuse you will notice an immediate improvement to the sound since when the fuse is blown there is no sound at all. 

A live test is a test in real time with people in the room. 

Do a live test of fuse directionality with any group of serious listeners and you will notice that no consensus regarding audible differences of fuse direction will occur. I dare anybody to try this (I did). And Dabel, since you're apparently incapable of noting sarcasm, by "special" I imply special listening skills claimed by the Fuser community, not your pseudo spiritual claptrap.

Always buy the most expensive fuse that SR dishes up every couple of years as although they do nothing (except some previous versions I tested extensively did blow as they were rated improperly), the higher price does increase your expectation bias and thus the imagined improvement. Especially when fuse direction is tested...you know you can hear the difference because you know you’re Special, and although fancy fuses have been rejected by the vast majority of audiophiles and manufacturers (and really, what the hell does Nelson Pass know anyway?) you feel better...and people respect you (maybe)...you’re smart and a little more sensitive...you do get a 30 day trial period to return them, possibly casting doubt on your Specialness, and hey...you don’t want that.