Following in the footsteps of its predecessor, the Rickenbacker 4003 bass guitar offers updates to the 4001 just as the 4001 upgraded the 4000. Though the 4001 went out of production in the '80s, the 4003 lived on to become Rickenbacker’s most popular bass model. The cresting wave body shape remains consistent between the 4001 and 4003, but the 4003 bass changes up the truss rod system. The 4003 has collected a number of famous fans, including Geddy Lee, Chris Squire, Paul McCartney, and more.