nobody can explain the technical design aspects of "special" fuses ....FWIW, I for one certainly can’t. I’ll say also that it seems to me that audio is somewhat unique in that there are countless technical variables that can be cited for which it is not readily possible to define a quantitative threshold separating what may potentially be audible in some systems from what is unquestionably insignificant. In the absence of that kind of quantitative perspective there is essentially no limit to what a perceived or claimed sonic effect can be attributed to. Or misattributed to.
Best regards,
-- Al