A preamp is a preamp, regardless of its physical location. Chronologically for electric basses, they were first mainly only found inside amplifier units, then some people started putting them into basses with the intent of them being talked to by a proprietary pickup which happened around when rack mount preamps also came along to color up rack mounted power amps, and as far as I’m aware pedal-form preamps came to the scene last.
There are a lot of bassists who are or have used a total of three or more preamps all at once as an always-on signal path. One I’ve seen used by more than a hundred other players: a StingRay into a Sansamp into a GK RB amp.
Pickups can have any type of natural voicing that’ll either accentuate or diminish aspects of the voicing of the physical bass guitar unit. It seems like most pickups designed with a proprietary preamp in mind are intentionally voiced with a dip somewhere between 250hz and 4khz yielding a remaining fat bottom and crispy highs and something unique to that design in that huge range of mids, though some are designed with a big bump in the mids as the priority which makes the highs & lows sound diminished to some ears and refined to other ears.
Of course there are intentionally passive pickups can and are designed with a mid dip or bump and definitely there are preamps available to be bass-mounted, rack-mounted, floor-laid, or amp-enclosed that will accentuate that dip or bump and there are many preamps that have such a strong dip or bump that it counters the opposite dip or bump in the pickup you’re using.
I’m thinking of that crisp tone with a touch of tenor, it is especially great for that punchy funk sound that slapping and popping brings out, but I wonder…
Is there a good way to get that sound out of passive pickups?
That’s pretty much the StingRay sound or Marcus Miller’s ‘77 Jazz Bass with either a Stars or Bartolini preamp loaded in by Roger Sadowsky before he had finalized his own preamp design which could be either bass mounted or floor laid and also works well with passive pickups for doing the thumpy snap & crackly slap & pop thing.
So…
Yeah, get a bass with two coils that can be wired in parallel and send it through some preamp that allows/encourages further mid scoop. It could just be a 1980s Mesa or Ampeg amp head with the bass & treble cranked and the mids cut and any Ultra Hi & Ultra Low switches activated, it could be a brand new John East inboard preamp and you’re plugging straight into the interface hooked to your laptop while recording into a DAW or plugged straight into a brand new QSC or Crown power amp. You could get silly with it and run a G&L L1000 switched to parallel into three BDDI’s one into the next all with the mids at 7:00 and the bass, treble, and presence at 5:00 and then into an SVT 4Pro and max out the smiley scoop on that. I’m honestly really curious how that’d sound live in a mix with either a horn & keys heavy Funk & Soul band and in a distorted guitars heavy rock & metal band.
Can the scoopy thing be done with an Overwound and Midrange-Bumpy (often referred to as being “growly”) single coil bass or O&MB series-wired dual coil bass? Definitely. It likely can also be done to weird mid-heavy active basses too.