The Reference NF-102 consists of solid, high-purity OFC copper which is covered with DUO-PE II insulation. The PE tubes illed with air, an innovative GAP plug, the exact arrangement of all elements, in particular the very sophisticated centrally-located, solid signal conductor all ensure uniform transit times. The PE network jacket prevents micro-vibrations. AUDIO: “As a speaker connect ion, the Reference series from in-akustik has long been a hit, having put the audio cable in its shadow. However, now the NF-102 counts among those which put others in the shadows. ... the sound remains free of harshness of any sort. In fact, the clarity, contour and the effortless resolution were all pleasing - a real all-round cable.”