Get the most out of your home audio system with high quality, oxygen-free, pure bare copper speaker wire from Monoprice! This speaker wire features two conductors made of high purity (greater than 99.95 percent pure), oxygen-free bare copper. Pure Bare Copper is a superior conductor to the copper clad aluminum (CCA) conductors used in most other inexpensive speaker wire. CCA is only about 68 percent as conductive as pure bare copper. This additional resistance is added to the impedance of your speakers and can negatively affect the sound. For the wire to have no audible effect, the total wire resistance should be no more than 5 percent of the lowest impedance of your speakers. Even speakers rated for a nominal 8-ohms, may dip to as low as 4-ohms at some frequencies, which further reduces.