Precisely because audio signals are so sensitive, we have equipped our Reference NF-202 audio cable with some highly-effective technology: optimum DUO-PE II insulation with air-filled PE tubes, an innovative GAP plug, but also in particular an extremely sophisticated, solid conductor made of high-purity OFC copper, which all ensure uniform transit times and crystal-clear signal transmission. The earth and signal conductors are the same size and arranged symmetrically. The PE network jacket prevents micro-vibrations. AUDIO: “The unobtrusive, clean sound of this cable fared extremely well in the blind tests. Without exception, every listener described the cable as pleasant, powerful and quiet, and that it had stable reproduction characteristics; a superior sound conductor.”