Or it is possible that he and I hear the differences and no existing scientific measure can explain it. As I have suggested there is directionality to wire also and there is a draw direction of wire. Some manufacturers go to great means to assure the direction of the wire draw is that used consistently in their wire. Micro Omega is one such company. Perhaps there is a direction to the fuse conductive element.
One final suggestion. Since I suspect that you have failed to hear the direction of a fuse, or perhaps never even tried to do so, you may merely be imagining that you hear no differences.
One final suggestion. Since I suspect that you have failed to hear the direction of a fuse, or perhaps never even tried to do so, you may merely be imagining that you hear no differences.