Published at Friday, August 31st, 2018 - 20:09:40 PM. . By Alison Shell.
Setting correct pickup height is vital to a good round sound and volume. The standard jazz bass pickup will come with four screws (two on each side). The screws adjust the pickup up and down. On the shafts of each screw are springs. Those springs provide tension which keeps the pickup from falling down to the bottom of the body cavity. The springs also provide upward and downward pressure. When you loosen the screws the tension from the spring pushes up on the pickup allowing the pickup to rise, when you tighten the screws down the springs are compressed and the pickup goes down.
There are some important things here to note. First, the pickups are actually out of phase. When both pickups on a Jazz bass are turn up full on, the pickups cancel out any hum that may be in the area. If you use one coil only, it will be in single coil mode, and you can pick up hum. If you like the sound of only one coil, and hate the hum, try using a split coil Jazz Bass pickup, and wire them in hum-bucking mode. Dimarzio make these, and they are a very good sounding pickup. I have used them on previous Jazz Basses, and they work well. I especially like the adjustable magnetic pole pieces, which are easily adjusted with an Allen screw driver. Secondly, the control knobs shown (above) are wired in the Jaco Pastorious prefered fashion: Volume, Volume, Tone. The standard method is to have: Volume, Pan, and Tone.
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