Which upgraded fuse is recommended for an Onkyo and Elac setup?


I have acquired a mid grade hi fi system that I am going to put in my office. Its an Onkyo avr priced under $1000 ( purchased sometime in the last year by my brother) with some Elac bookshelf speakers priced around $500.  Not sure of the model numbers. 

In general...which fuse upgrade is recommended?  Trying to squeeze all I can out of this mid fi system. Thanks.
lightfighter2018
It would be a wonderful world if changing a piece of wire improved sound quality. Alas ...
roberjerman, It IS a wonderful world. Don’t be such a Debbie Downer. Remember the Little Engine that Could? 🚂 Get up off your LazyBoy and get to work. Wake up and smell the coffee! ☕️
imhififan
A Absolute Dream Power Cord can transform your $1k system to $10K!!!
https://www.thecableco.com/cables/power-cables/crystalpower-absolute-dream-power-cord.html
That's your claim perhaps, but not the one being made in the link you provided.