It’s not a figment of my imagination, it’s the tone I get when I play it unplugged. Very clean, very natural. Of course electronics will change that, I just want to get the least coloured and broadest dynamic range pickup to highlight the subtleties of the bass as much as possible.Lol i don't know how you expect people to answer this. "Natural tone of the bass".... even if you believe in the tonewood debate, its at best like 5-10% of the tone the other 90% is the pickups and strings (and obviously your touch). So by you changing the original builders configuration or pickups.. you are changing "the natural sound" and you clearly just have something in your head that you want the bass to sound like.
If you were using an active Pre-amp it would kinda make sense to swap it out for the passives of your choosing but literally whatever pickup you throw in there is what the the bass is ultimately going to sound like... and even then the difference in passive pickups is literally just a matter of magnets and how wound it is.
So in other words just go listen to some P pickup samples and if what in your head sounds close to one of them, thats what it will sound like. The "natural tone" of your bass is because its already just a figment of your imagination lol.. find a Pup you like, and it will sound like that.. I know Bartolinis are typically really mellow and smooth.
