Red River RCA (Pair)SOLID PERFECT SURFACE COPPER (PSC) CONDUCTORS Since the beginning, AudioQuest has pioneered the use of superior metals, yet even we were surprised by the huge leap in performance attained through the astonishingly smooth and pure surface of Perfect Surface Copper (PSC). Proprietary metal processing technology protects the wire's surface at every stage of drawing and fabrication. When high purity low oxide copper is kept as soft, pure, and smooth as