The difference between Reference and Prestige series, basically speaking, are stylus mass, tip mass, diamond shapes and size, different coils, different wires and compliance. The cost difference between the Reference and Prestige series are the closer tolerances, skilled technicians vs assembly line production, much higher parts cost and different design in the Reference series. The Prestige series of cartridges are designed for high output and excellent stability under severe use. A considerable tip mass reduction results in a frequency response to 55 kHz and beyond and tracking forces from 1-2 grams.
The Blue and Red models use a four piece OTL cantilever technology, standard oxygen free wire in the coils and Grado's specially designed elliptical diamond mounted on a brass bushing. The Red model is selected from the Blue production run and meet higher test specifications. Approximately 10% of the production run will meet these standards and become Red models.
Grado Blue & Red Technical Specifications:
Output at 1KHz 5CM/sec. 5mV Cartridge Type: Moving Iron Stylus Type: Specially designed elliptical diamond Wire: Ultra-high purity long crystal copper Frequency Response: 20~55,000 Hz Recommended Load: 47 Kohm Channel Separation at 1KHz 30 Imput Load 47K Recommended Tracking Force 1.5 Inductance 45mH Resistance 475 Compliance CUs 20 Stylus Replacement U=user U Mounting S/P Weight 5.5 Body: ABS plastic