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In designing 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 they incorporated metal covers with foil-shielded cables to further suppress the background noise.

DiMarzio’s extra shielding makes the Relentless™ J better for both recording and stage performances. They mounted it onto a robust .09375” thick circuit board base plate so they could eliminate the annoying protruding mounting screws — ultimately creating a more comfortable and consistent foundation to rest your fingers on.
To improve the balance when both pickups are used together, DiMarzio made the bridge position pickup louder than the neck position pickup. When the pickups are blended, you get a better volume match.
The Relentless™ pickups incorporate Neodymium magnets and produce 70 percent more output than traditional passive pickups, and they’re dead quiet. DiMarzio has expanded the mid-range punch, adding snappy highs and precise lows. These pickups have a broad magnetic field so you can even bend notes without volume drop out.
Relentless™ J pickups will breathe new life into any bass, increase playability, and work well for any style of music from Motown to metal.
**Sorry international bassists, but US Dealers are not authorized to ship DiMarzio pickups outside of the US.
Please contact us if you are having trouble finding DiMarzio products in your home country.
Size (Bridge):
3.73" [94.74mm] Long
.725" [18.42mm] Wide

Size (Neck):
3.61" [91.57mm] Long
.725" [18.42mm] Wide

These Jazz Bass® pickups from DiMarzio are very hot. They offer more mid-range than other DiMarzio pickups, and have a top end roll off. These are a powerful pickup that has a percussive feel - surprising since the top end is slightly shy…but the mids carry the tone really forward. Excellent choice for rock, punk and other genres.
Put on a good set of headphones and check out the audio demo below to hear it for yourself.
As always, keep in mind that these are generalizations. Your experience could be different depending on many factors.