Published at Friday, August 31st, 2018 - 20:15:17 PM. . By Esperanza Roux.
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.
With the help of the installed pickup springs turn a phillips head screw driver to move the pickup up or down. Moving the pickup higher or up towards the strings will yield a louder over all tone. Moving it away or down from the strings will result in a quieter volume. You want to strike a balance between the two which I find can be done by making your pickups like a ramp. You want to give the lower E and A strings plenty of room to vibrate so keep that end of the pickup just a bit lower, while making the D and G string side just a tad higher. It shouldn't be extreme but all the strings need to clear the pickup otherwise the case for the pickup itself will get scratched and the sound of your fingers hitting the top of the pickup will make an unwanted "thump" sound, that is unless you want that thump sound.
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