Fuses don't and will never have any meaningful effect on a well designed power supply when working to accomplish what fuses are actually designed for (protecting the component from catastrophic failure due to sudden power surges), have zero sonic effect on any signal if working as designed (with clean contact points and proper ratings), and to believe otherwise is silly. This is why very few high end component designers care about "premium" fuses in their products. It takes a lot of purposeful hyperbole to sell snake oil, and if that's entertainment for anybody, enjoy this space!