Ive got a JB5 F type 1 set, nothing else to say but killin' pickups !! they will reproduce the natural character of your bass, depending on the woods used to built it. Punchy mids with ash body/maple neck, they can be really fat with alder body/ rosewood fibngerboard, but you can also do what you want with those pu's just by setting pu's height, large frequencies' range, what else, the nirvana ! sounds warm too
I Use a passive JB5 Fender with an EWS tri-logic preamp, pure tone ....