Yeah, I also have a hard time believing anyone isn’t hearing a difference unless they are putting them in a router or something. In every component I’ve used aftermarket fuses had an equivalent effect as a power cable, and each one sounds different. They also create what absolutely must be measurable differences in frequency response and transient energy. There are enough YouTube videos put there comparing different ones, and the difference clearly comes through even over compressed video.
I mean it’s wild, even the shade of light and contrast in the LCD displays changes.
The main components I understand are quartz sand, as a vibration damper, and various ferrite-like minerals that reduce noise. They also seem to greatly increase the current a component can draw from the wall.
I'm interested in how the Pink sounds, esp if it corrects the midrange excess of the Purple.