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Single crystal copper (OCC) for the production of audio wire, is a major breakthrough in recent years audio wire and cable manufacturing industry. Scientific experiments prove that: single crystal copper is a kind of high purity oxygen-free copper (purity as high as 6N), the whole copper rod by only one or a few grain composition, no "The grain boundary" or "A few grain boundaries" ("The grain boundary should to cause signal reflection and refraction, sequentially signal attenuation) therefore the signal transmission performance of the OCC is the extremely high.