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