AudioQuest 's Golden Gate mini cables feature Perfect-Surface Copper (PSC) conductors and gold-plated RCA plugs for a marked sonic improvement over standard mini cables. PSC lowers distortion to levels even further than AudioQuest 's Evergreen cables. The Noise-Dissipation System ensures that RFI noise is a thing of the past, while Foamed-Polyethylene Insulation keeps Golden Gate 's sound focused and sharp. Perfect-Surface Copper has an astonishingly smooth and pure surface. 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 possible, it becomes a wonderfully low-distortion conductor. For over 30 years AudioQuest has pioneered the use of superior metals; yet even we were surprised by this huge leap in performance. PSC clearly outperforms previous AQ metals that cost over ten times as much. Electrical and magnetic interaction between strands in a conventional cable is the greatest source of distortion, often causing a somewhat dirty, harsh sound. Solid conductors are fundamental toward achieving Golden Gate's very clean sound. Any solid material adjacent to a conductor is actually part of an imperfect circuit. Wire insulation and circuit board materials all absorb energy (loss). Some of this energy is stored and then released as distortion. Golden Gate uses air-filled Foamed-Polyethylene Insulation on both conductors because air absorbs next to no energy and Polyethylene is low-loss and has a benign distortion profile. Thanks to all the air in Foamed-PE, it causes much less of the out-of-focus effect common to other materials. 100% shield coverage is easy. Preventing captured RF Interference from modulating the equipment’s ground reference requires AudioQuest 's Noise-Dissipation System .