I, being the skeptic I am, do not completely buy this. Such believers further suggest that some pickups (brands, types, and magnetic materials) are more susceptible to this. Because of this, some people suggest that the closer you adjust the pickup toward the string, the more chance you have that the pickup’s magnetic field will cause your strings to contract and expand, forcing them out of tune. Pickups are magnetic, and your strings are metallic. The closer you get the pickup to the string, the higher the output will be from the pickup (and thus, noise). Most players want their settings to be equally balanced, with the G-string and E-string having the same amount of volume in the output. E-string heavy, G-string heavy or equally balanced). Since there are two screws to tighten, you can adjust each side of the pickup to different heights, giving you options on why sort of tone and balance you want (i.e. So when you tighten these screws, you tighten the spring and thus lower the pickups, and vice-versa. The screws are usually passed through the spring. Underneath the pickups, there is some sort of widget to push your pickups toward the strings. Usually, the pickup cavity is routed a little deeper to allow for adjustment, should you decide to lower your pickups.

Most pickups are mounted with a few screws, usually on the top (E-string side on a 4-string bass) and bottom (G-string side on a 4-string bass). Review the manufacturer recommendations, but keep in mind: where the pickups should be set is entirely up to you.

Each manufacturer should have some recommended settings for their pickups.

Emg bass pickup height