I don't know, but I was wondering if high end manufacturers of audio components use high end fuses. I have McIntosh 601's. They are 10k + for the pair. You would think companies like this would have researched this potential improvement. Even if they dropped a couple hundred bucks more on a component and it made their product sound better than the competition, they would do it, and list it in their features. I don't remember any company doing this. But they may be trying to cut corners or just don't know about it. No, I haven't tried high end fuses, so that may disqualify me from this discussion. But if some high end companies (like McIntosh) try to weigh in here, ignore them, they probably have not tried them either.