Theories are nice.....but the only way to know what something does audibly....is to listen.
All wires sound different.....all strandings sound different, all insulation sounds different, all wires (single strand or multistarnd) are directional (will sound different each way used). The vibrations in wires seriously effect sound. Getting wires off the floor or away from most things opens up the sound. If you cryo a wire it will sound different. YOU HAVE TO LISTEN. I have been listening to wires since the 70s......There is still no "perfect" wire......pretty darn good these days tho.....several of the suggested above are very, very good.