The sound of the Jazz Bass has been fundamental in the development of signature sounds in certain musical genres, such as funk, disco, reggae, blues, progressive rock, heavy metal and jazz fusion.First introduced in 1960 as the Deluxe Model, it was marketed as a stablemate to the Jazzmaster guitar which was also marketed as a Deluxe Model in its own right.featured a larger body shape, a 'curved' neck plate set into a chambered pocket for greater sustain and a 22-fret neck, similar to that of a Precision Bass Plus, with a standard vintage-style top-load bridge, two separate volumes and a master TBX tone circuit.Usually known as "Boner" Jazz Basses, these early American Standard models (designed by George Blanda, who was Fender's senior R&D engineer during that period) were discontinued in 1994 and shouldn't be confused with the Fender Jazz Bass Plus, which has the same 22-fret neck design, but utilizes a different (downsized) body styling, Lace Sensor pickups, Schaller "Elite" fine-tuner bridge on the four-string model or Gotoh high-mass bridge on the 5-string model, and Phil Kubicki-designed active electronics.While the Precision Bass was originally styled similarly to the Telecaster guitar, the Jazz Bass' styling was inspired by the Jazzmaster guitar, with which the Jazz shared its offset body and sculpted edges that differentiate it from other slab-style bass bodies.
The purpose of those mutes was to dampen the overtones and the sustain, and were screwed in place between the bridge and aft pickup.
It has a more focused tone than the Precision Bass, with less low end and low midrange.
Because of these tonal characteristics, the Jazz Bass is often preferred by bass players who seek a more noticeable sound, rather than serving as a background instrument.
A number of cosmetic changes were made to the instrument when CBS purchased the Fender companies in 1965.
During 1965/66 the Jazz Bass received bound rosewood fingerboards with pearloid dot position inlays (which replaced the older "clay"-style of the early 1960s) and oval-shaped tuning machines.