Most of the players I've seen complain about getting this killer signature bass tone have had nothing more than a generic P Bass and Ashdown rig with some crappy patches on a cheap pedal board thing, they insisted that the engineer takes at least post di if not a cab micd up only to have the worst bass sound out front all night that neither cut through the mix nor exhibited what the player was doing even when clearly playing some nice stuff, often too loud out front ruining the FOH mix because the amp was right next to the player and had to be loud for them to hear it.
Of course then if any of their fans say "you played great but the sound was terrible" guess what, it's the crappy sound crew because "we've spent ages getting the mix right in the studio".
I've even been that person in the past too.