So, on a whim I purchased a HiFi Tuning (Supreme) fuse from Michael Percy audio as I had a credit to use up. I haven't read much, if actually anything about these fuses nor had I read any reviews. However, curiosity got to me and I figured it would be an interesting experiment. Well, it came in this morning and install was quite easy. However when I powered up my amp (the one I put the fuse in) I sensed an immediate improvement in low level resolution and clarity. Now bear in mind, I'm very familiar with the sound of my speakers as I've had them in this office setup for nearly 7yrs now. They also happen to be the most resolving speakers I'm aware of, within sane money of course. Couple that with near-field placement and I'd say I know them quite personally. So I went on the hunt as to WHY am I hearing a difference and it seems to be that nobody really knows. Other than the fact that this fuse is solid silver, tip to tip, including the filament. Not silver plated. It has also been cryo'd and is in a special mixture of ceramic for the body. 99% Silver, 1% Gold. Could this little 5mmx20mm fuse actually make a difference? I was skeptical at the very least, but now I am just shocked at not only that it actually made a difference, but that it seemed as if the (get ready for a cliche) veil has been lifted. Music sounds more open, more detailed and more dynamic. Especially at low volumes that I listen to. So, these fuses are expensive. Not for everyone, but considering the cost and the performance I'd say worth it. However, that put me on the chase for a more reasonable fuse that may make a difference as well. Mouser.com stocks Schurter which is a military spec fuse that uses a similar ceramic body but the end caps are gold plated copper. Doesn't say what the filament is though I'd assume it's copper as well (probably wrong). If anyone has any experience with tuning fuses or has any sort of explanation other than the common "you can't hear a fuse, expectation bias, blah blah blah" I'd like to hear it. Best, Steven Z.