The extra pickup was added to the 4001 to widen tonal possibilities and up the bass frequency response. A great used bass.
Rickenbacker 4001 4003 Bass Pickup, bridge position
NOS 1976 Rickenbacker 4001 Bass Potentiometers Pots
1980 Rickenbacker 4001 Bass White w/OHSC
Bartolini 6RT Rickenbacker 4001 4-String Bass Ceramic Neck Pickup
Rickenbacker 4001/4003 Harness w/Vintage Tone - ROS w/SoZo Tone Caps
