Set up low impedance speakers with thin 18 gauge speaker wire. This affordable solution is perfect for your vehicle's audio system. The 18 AWG speaker cables featuring dual conductors are a top seller. Four-conductor in-wall 18 gauge wire for speakers also available. Suitable for car and home audio wiring, these 18 AWG cables come in these lengths: 50foot, 100feet, 250ft, 300 ft and 500 feet.