||This customer wanted an Aguilar OBP-3 installed into his Fender 5 string Jazz bass. The OBP-3 is a great little 3-band preamp that cuts and boosts 3 bands - low mid and high.
To accommodate the added controls I move the input jack from the front control plate to the side. This gives us an extra place to put a potentiometer in line with the other pots (a convenient trait of Fender basses - having the jack on the front like that).
This preamp runs on 9 or 18 volts, and this customer wanted 18v. So we need a cavity for the battery compartment which I placed in the back. I also added a toggle switch in the front above the control knobs. This switch changes the frequency bandwidth controlled by the "mid" control knob.
Fender MIM Jazz bass vs Warwick Corvette and Markbass ...
Moisés Cerezo (Demo) Fender Jazz Bass American Deluxe"