if turned in one direction, the dimensionality (and general sonics) sound "off," or, as others put it, "flattened," I don’t know the mechanics
There are no mechanics just AC mains theory, which needs brushing up on.
Mains in US changes it’s flow direction 60 x a second, 50 here in Au.
To be able to hear if a mains fuse "is" directional, you would have to pull it out and change it's direction 60 x's in one second and! to stay in sync with the mains doing it!!!
Cheers George