Bartolini Pickup Set for Jazz Bass #9J, Black. These are single coil units with strong lows and low mids. When used together they will have very low hum and noise levels. The tone of these pickups is deeper than vintage pickups; their strength is in the lows and low mids. The Neck and Bridge coils are equal as in the original Fender pair. Using either Neck or Bridge pickup alone will result in some hum and noise. -Our single coils are quieter than traditional single coils but not quiet enough to be recommended for use with electronics.The 9J1 has bright Neck tone and deep Bridge tone. The #1 windings yield much more "growl" from the Bridge pickup. They are very similar to our old 94J pickups, just ever so slightly brighter at the bridge.