Reduces hum, increases tonal range, and adds growl.
The Bartolini 9J1 4-String Jazz Bass Pickup Set features a hum-canceling dual in-line coil design. The 9J1 has a bright Neck tone and deep Bridge tone. The #1 windings yield much more "growl" from the Bridge pickup. They are very similar in tone to Bartolini's 94J 4 string pickups, just ever so slightly brighter at the bridge.