Played an older G & L at rehearsal last night...had a single MM style humbucker in the center sweet spot....I think it was passive, though...What a wonderful sounding bass! Endless sustain, and clear and clean as a bell.
That was either an L 1500 which has switching for active or passive along with a series parralel switch or it could have been an L 1000 which is no longer made and had one 3 position switch- parallel humbucking, single coil and single coil with bass boost but no series humbucking. The L 1500 pickup is in the music man spot while the L1000 pickup is closer to a P bass location. The L1000 was Leo's first G&L design and was phased out after introduction of the L2000.