This weekend, I decided to play around with my passive basses and several capacitors. I noticed that 2 of my P basses had very low, thumpy bass tone with the tone knob rolled off. The other two had a very honky midrangey tone with the tone knob rolled off. I recenlty bought a prewired kit for one of my jazz basses with a push/pull pot for series/parallel wiring. This came with a .022 cap and I noticed it still had a LOT of aggressive mids with the tone knob rolled off. This got me researching and experimenting. My two honky midrangey P’s had .05 caps in them. The two super low bassy P’s had .1 caps in them. All of my J’s had .05’s besides the one I had just rewired with a .022. I decided to order a handful of capacitors ranging from .022, .033, .047, .068, and .10 to see what sounded best in which bass. My findings were, the .068 sounded great IMO in a P bass. I thought the .047 was too honky and the .10 was too flubby and undefined. A .068 seemed to be perfect in a P bass. Big fat tone with the tone knob rolled off but kept enough definition to not be muddy. Next on the jazz basses, I also found to .047 (or .05) to be too honky and it lost too much of the Jazz Bass growl with the tone rolled off. The .022 seemed to retain all the growl. But, was almost too aggressive and didn’t have that buttery feel you kinda look for when you roll the tone off. I tried a .033 cap in the jazz basses and they were IMO perfect. With the tone rolled off, they sounded super fat and still had that aggressive jazz growl. Anyone who has a couple dollars and free time should experiment. You’d be amazed what a difference changing a capacitor will do. For me, a .033 in a jazz bass and a .068 in a P Bass was pretty life changing.