I have tested directional wires, all this means is the wire was drawn and Angeles
In that direction , and through my Electrostats speakers most any changes can be heard . Slightly better a bit more pronounced . BUT, if you leave opposite for 24 hours everything is pretty much =. It is Not a permanent change, Cryogenic immersion is a permanent change for example and + result For example.
>>>>The problem with your test is that when you disrupt the sensitive physical/electrical interface of the cable connections when reversing cables it takes at least two days to reestablish those interfaces. So any conclusions you might draw initially within the first 24 hours should be disregarded. Same with Cryo, you should never judge the effects prematurely since it can take up to a week for the materials involved to recover from the thermal shock of Cryo.
Also, since cables that have been in use for MANY YEARS exhibit directionality - when the sensitivity of physical/electrical interfaces are observed - obviously the change is permanent. Ditto for fuses, even stock fuses, that have been in use for MANY YEARS. They exhibit directionality when reversed, for better or worse, and MAINTAIN that directionality. HiFi Tuning used to think their fuses would eventually break in whichever direction they were installed. Later they recanted and now think their fuses, and all fuses, are directional, directional in the PERMANENT sense. Which is why they mark their fuses with a diode symbol.