Quote Originally Posted by kexodusc
This begs the question, in practical terms, if each wire is going to see more than 1 individual frequency at a given point in time...
Correct me if I'm wrong, but is this a correct assumption? We do fourier analysis when looking at signals, but really, it's still and always will be one signal. A difference potential across the outputs of the amplifier will send electrons scurrying ("...scurrying..." at the speed of light, that is) across the wires to create an analogous potential drop at the other end of the wires, back-EMF notwithstanding. The only multiple-frequency situation will be at the point where the back-EMF interacts with the incoming current.