The 2500 uses a nude, square shank, natural diamond stylus in a diagonal orientation with a proprietary 2SD line-contact profile. The stylus only contacts the groove wall along the short radius ridges which are so fine that it can accurately trace details down to 4 microns – enough for replay of quadraphonic records. Because the contact area is elongated along the complete side wall of the groove it is twice that of an ordinary elliptical stylus; mid-range tonality is incredibly accurate and precise and any high frequency sibilance or distortion is banished.
