IE: ALTERNATING CURRENTThat is the key word! Current alternates direction. Yes, DC power does exist, and transformers are DC to keep from blasting everything with a 60 cps hum, but interconnects and speaker wire? NO! Think about it. Current for a 400 cps signal, for example, goes back and forth 400 times per second. It does not flow like water. The current driven magnetic force pushs the speaker out 400 times a second and pulls it in 400 times per second. It does not push and rest. Directional wiring for alternating currents, such as for fuses, speaker, and interconnect wires, is pure witchcraft, i.e. fantasy. If you do not grasp this, I have some magical, one direction, magiquark driven fuses for sale. Call 1-800 One Muon.
power cord directionality
IF power cords do indeed have preferred directionality, and one is inadvertently flipped for a few hours, does it "harm"it?