Interesting post. I now have a collection of SR fuses that are worthless. I guess they go to my fuse grave. I understand technology but I can not be switching fuses every 18 months. That is one of the reasons I like QSA.
So here is a question....if you have multiple different fuses in your system, how do you know which one is really making the impact on your sound? Let me give you an example. I have an SR orange in my Music Server, and my DAC and my mono amps and pre-amp. I went to QSA yellow one component at a time. After changing the source which was my Lampi Pacific, I did not hear any change. After a couple of weeks, I added it to the Pre-amp. Again not much of a change. I finally added to the monoblocks. Once I had the same fuse in all of my components did I hear a noticeable difference.
Based on my experience, I would find it hard to believe, that if you only placed an upgraded fuse in only one component, you would hear a difference. Now I am also of the opinion that upgraded fuses will help lower-end systems more than high end systems but that is another debate.
Thoughts?