Grado Prestige 3 GreenBoth the Black3 and Green3 use a three piece OTL cantilever that has a Grado specific diamond mounted on a brass bushing. The Green3 are hand selected from Black3 production runs which meet higher test specifications. Approximately 15% of the run usually exhibits these specs and become a Green3. Grados OTL, or optimized transmission line, technology provides an ideal transfer of signal from the surface of the LP to the generator of the system. This
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