DiMarzio introduced the world’s first Fender Jazz® bass replacement pickups at the NAMM show of 1977. DiMarzio invented the dual bar ceramic magnet structure for extra power and included twin hum-cancelling coils for decreased noise. The DiMarzio Model J™ is 50 percent quieter than the original Fender Jazz® bass single coil pickups, and it's 60 percent louder. They also added adjustable pole pieces to improve the string balance and designed them in our signature cream color. At its introduction, the DiMarzio Model J™ immediately become an industry standard and has been the pickup of choice on thousands of hit recordings. With the introduction of the Relentless™ P bass® pickups, co-designed with Billy Sheehan, DiMarziio began to think how they could make their Jazz Bass® pickup even better. As with the Relentless™ pickups, DiMarzio removed all the hard edges from the standard J Bass® pickup and added an arch to the top of the pickup to bring the sensing coils and pole pieces closer to the strings. These improvements increase the dynamic range and make active circuits unnecessary. DiMarzio invented (patent pending) parallelogram-shaped coils to add dimension, punch, and dynamics to the Relentless™ J sound, and we incorporated metal covers with foil-shielded cables to further suppress the background noise.
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