"I am happy that your $200 fuse made such an improvement in your system. Now take that one out and put in a $3 Littelfuse and re-evaluate. Chances are you won't hear a difference."
I've done that. A couple of times, actually.
I can absolutely hear a difference.
If you'd like a demonstration, come on over and bring a six pack.
We can swap cables back and forth, too. (Won't THAT blow your mind!)
We'll make an afternoon of it.