Twin core figure of cable, copper conductors oversheathed with PVC Speaker wire is used to make the electrical connection between loudspeakers and audio amplifiers. Modern speaker wire consists of two electrical conductors individually insulated by plastic. Certain older designs also featured another pair of wires for a powered line to power an electromagnet in the loudspeaker before permanent magnets became economical to produce and use.The effect of speaker wire upon the signal it carries has been a much-debated topic in the audiophile and high fidelity worlds.