Both "passive" and active basses are electric instruments.
They both use magnets and coils to turn string vibrations into an electrical signal.
They both run through pedals and an amplifier.
An active setup simply means there's an extra little preamp/EQ in the chain.
I always find it odd when passive basses are described as "raw" or more "natural".
Mostly because people either are using crappy preamps or a preamp that colors the tone.
A great passive bass will sound as same with a good preamp. A sucky passive bass will suck no matter the preamp you put in there.