Quote Originally Posted by Macca View Post
My understanding is that it is all about impedance. Skin effect increase impedance and we don't want high impedance. The higher the frequency the higher the impedance. So it is more of a problem at high frequencies. At audio frequencies it only adds a tiny amount of impedance that is swamped by the impedance of the amplifier, the wire itself and the loudspeakers. You're never going to be able to distinguish the tiny contribution it is making.
A bit of light reading for anyone interested: