The Z1 pickup spacing is modeled after the J style bass. The tone combinations will be familiar to anyone used to a J style bass.
The Z2 spacing features two pickups grouped together in the sweet-spot. The tone is more focused in the mid-range than the standard spacing. This tone will be familiar to anyone used to a MM SR tone.
The Z3 is a 3 pickup system that combines the Z1 and Z2 pickups. This system provides the ultimate in tone-shaping versatility. Almost any bass tone you can think of is available at your fingertips.