Theoretically saying every conductor has chrystalic malstructures of the semi-conductor nature("impurities")
Let's consider these impurities as diodes(one-way conductivity devices) randomly connected in different directions of the current flow.
Even the cleanest 99.999% cooper conductor has these impurities despite of having almost no oxides. Within the break-in time we bypass such micro-diodes that are in direct connection and "electrically break" micro-diodes with the opposit connections relatively to the current flow.
That's why cables will have to be reburn for the opposite direction.
How it is different sonically?
I do not believe that human ear is capable to distinguish it even on $10k amps with $10k speakers for example.
Let's consider these impurities as diodes(one-way conductivity devices) randomly connected in different directions of the current flow.
Even the cleanest 99.999% cooper conductor has these impurities despite of having almost no oxides. Within the break-in time we bypass such micro-diodes that are in direct connection and "electrically break" micro-diodes with the opposit connections relatively to the current flow.
That's why cables will have to be reburn for the opposite direction.
How it is different sonically?
I do not believe that human ear is capable to distinguish it even on $10k amps with $10k speakers for example.