In the famous HiFi Tuning measurements of electrical characteristics of fuses of many brands including stock fuses, the lower resistance direction was always consistent with the direction that sounded the best, both for DC circuits and AC circuits. But as noted on the HiFi Tuning data sheets, the rather small differences measured did not account for the relatively significant differences heard in listening tests of “directionality.” And as fate would have it that’s how directionality can be controlled, by controlling the manufacturing process starting with the wire as it comes off the final die. I.e., it’s predictable. Hel-loo!
