Grado Prestige 3 BlueBoth the Blue3 and Red3 use a four piece OTL cantilever that has a Grado specific diamond mounted on a brass bushing. The Red3 are hand selected from Blue3 production runs which meet higher test specifications. Approximately 10% of the run usually exhibits these specs and become a Red3. 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 technology
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