Skin Effect

The tendency of high frequency current to travel near the outside of an electric conductor rather than through its cross section. Skin effect increases the effective resistance of a wire at higher frequencies. While skin effect is a very important concern when working at the high frequencies of radio and television, it is widely considered to be a minor issue at the relatively low frequencies used in the audio world. There are many audio purists, however, who dispute this and claim that it still does make a difference.