Bass bodies are typically made of wood, although other materials such as graphite (for example, some of theSteinberger designs) have also been used. While a wide variety of woods are suitable for use in the body, neck, and fretboard of the bass guitar, the most common type of wood used for the body is alder, for the neck is maple, and for the fretboard is rosewood. Other commonly used woods include mahogany, maple, ash, and poplar for bodies, mahogany for necks, and maple and ebony for fretboards.
Other design options include finishes, such as lacquer, wax and oil; flat and carved designs; Luthier-produced custom-designed instruments; headless basses, which have tuning machines in the bridge of the instrument (e.g., Steinberger and Hohner designs) and several artificial materials such as luthite. The use of artificial materials (e.g., BassLab) allows for unique production techniques such as die-casting, to produce complex body shapes. While most basses have solid bodies, they can also include hollow chambers to increase the resonance or reduce the weight of the instrument. Some basses are built with entirely hollow bodies, which change the tone and resonance of the instrument. Acoustic bass guitars are typically equipped with piezoelectric or magnetic pickups and amplified.
Instruments handmade by highly skilled luthiers are becoming increasingly available. Exotic materials include woods such as bubinga,wenge, ovangkol, ebony and goncalo alves. Graphite composite is used to make lightweight necks. Exotic woods are used on more expensive instruments: for example, Alembic uses cocobolo as a body or top layer material because of its attractive grain. Warwick bass guitars are also well-known for exotic hardwoods: most of the necks are made of ovangkol, and the fingerboards wenge or ebony. Solid bubinga bodies are also used for tonal and aesthetic qualities.
The "long scale" necks used on Leo Fender's basses, giving a scale length (distance between nut and bridge) of 34", remain the standard for electric basses. However, 30" or "short scale" instruments, such as the Höfner 500/1 "violin bass" played by Paul McCartney, and theFender Mustang Bass are popular, especially for players with smaller hands. While 35", 35.5" and 36" scale lengths were once only available in "boutique" instruments, in the first decade of the 21st century, many manufacturers have begun offering these lengths, also called an "extra long scale." This extra long scale provides a higher string tension, which yields a more defined tone on the low "B" string of five- and six-stringed instruments (or detuned four-string basses).
Fretted and fretless basses
Another design consideration for the bass is whether to use frets on the fingerboard. On a fretted bass, the frets divide the fingerboard into semitone divisions (as on a guitar). The original Fender basses had 20 frets, but modern basses may have 24 or more. Fretless basses have a distinct sound, because the absence of frets means that the string must be pressed down directly onto the wood of the fingerboard as with the double bass. The string buzzes against the wood and is somewhat muted because the sounding portion of the string is in direct contact with the flesh of the player's finger. The fretless bass allows players to use the expressive devices of glissando, vibrato and microtonal intonations such as quarter tones andjust intonation.
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Some bassists use both fretted and fretless basses in performances, according to the type of material they are performing, as with Pino Palladino, whose performance on the fretless bass during the 1980s made him a highly desirable session player backing high profile musicians that included Eric Clapton and David Gilmour. However, the late 1990s showed a shift toward fretted basses as well, as he branched out into a wide variety of genres. While fretless basses are often associated withjazz and jazz fusion, bassists from other genres use fretless basses, such as metal bassistSteve DiGiorgio and Colin Edwin of modern/progressive rock band Porcupine Tree.
The first fretless bass guitar was made by Bill Wyman in 1961 when he converted an inexpensive Japanese fretted bass by removing the frets. The first production fretless bass was the Ampeg AUB-1 introduced in 1966, and Fender introduced a fretless Precision Bass in 1970. In the early 1970s, fusion-jazz bassist Jaco Pastorius created his own fretless bass by removing the frets from a Fender Jazz Bass, filling the holes with wood putty, and coating the fretboard with epoxy resin. Some fretless basses have "fret line" markers inlaid in the fingerboard as a guide, while others only use guide marks on the side of the neck.
Tapewound (double bass type) and flatwound strings are sometimes used with the fretless bass so the metal string windings don't wear down the fingerboard. Some fretless basses have epoxy coated fingerboards to increase the fingerboard' durability, enhance sustain, and give a brighter tone. Although most fretless basses have four strings, five-string and six-string fretless basses are also available. Fretless basses with more than six strings are also available as "boutique" or custom-made instruments.
Strings and tuning
The standard design for the electric bass guitar has four strings, tuned E, A, D and G, in fourths such that the open highest string, G, is an eleventh (an octave and a fourth) below middle C, making the tuning of all four strings the same as that of the double bass. This tuning is also the same as the standard tuning on the lower four strings on a six-string guitar, only an octave lower. String types include all-metal strings (roundwound, flatwound, groundwound, or halfwound), metal strings with different coverings, such as tapewound and plastic-coatings. The variety of materials used in the strings gives bass players a range of tonal options. In the 1950s and early 1960s, bassists mostly used flatwound strings with a smooth surface, which had a smooth, damped sound reminiscent of a double bass. In the late 1960s and 1970s, roundwound bass strings similar to guitar strings became popular, though flatwounds also continue to be popular. Roundwounds have a brighter timbre with greater sustain than flatwounds.
A number of other tuning options and bass types have been used to extend the range of the instrument. The most common are four, five, or six strings:
- Four strings with alternative tunings to obtain an extended lower range. Tuning in fifths e.g., CGDA gives an extended upper and lower range.
- Five strings usually tuned B0-E1-A1-D2-G2, which provides extended lower range. Five string basses tuned to B-E-A-D-G (and sometimes A-D-G-C-F) are often used in contemporary rock andmetal alongside seven string guitars, baritone guitars, and otherwise downtuned instruments. Another common tuning used on early five-string basses is E-A-D-G-C, known as "tenor tuning". This is still a popular tuning for jazz and solo bass. Other tunings such as C-E-A-D-G are used though rare. The fifth string provides a greater lower range (if a low B or A is used) or a greater upper range (if a high C string is added) than the four-string bass, and gives access to more notes for any given hand position. The earliest five string was created by Fender in 1965. The Fender Bass V had the E-A-D-G-C tuning, but was unpopular. The common low B five string was created by Alembic for Jimmy Johnson as a custom instrument, and later Yamaha offered the first production model as the BB5000 in 1984.
- Six strings are usually tuned B0-E1-A1-D2-G2-C3. The six-string bass is a four-string bass with an additional low "B" string and a high "C" string. While much less common than four- or five-string basses, they are still used in Latin, jazz, and several other genres, as well as in studio work where a single instrument must be highly versatile. Alternative tunings for six-string bass include B-E-A-D-G-B, matching the first five strings of an acoustic or electric guitar, and EADGBE, completely matching the tuning of a six-string guitar but one octave lower allowing the use of guitar chord fingerings. Rarer tunings such as EADGCF and F#BEADG provide a lower or higher range in a given position while maintaining consistent string intervals. The original six-string bass was created by Danelectro in 1958, as a guitar tuned down an octave (EADGBE). In the 70s, Anthony Jackson worked with Carl Thompson and (later) Fodera in cooperation with Ken Smith to create the Contrabass guitar, which evolved to the modern six-string bass (BEADGC).
- Detuners, such as the Hipshot, are mechanical devices operated by the thumb on the fretting hand that allow one or more strings to be quickly detuned to a pre-set lower pitch. Hipshots are typically used to drop the "E"-string down to "D" on a four string bass.
[edit]Alternative range approaches
Some bassists have used other types of tuning methods to obtain an extended range or other benefits such as providing multiple octaves of notes at any given position, as well as a significantly larger tonal range. Instrument types or tunings used for this purpose include basses with fewer than four strings (one-string bass guitars, two-string bass guitars, three-string bass guitars (E-A-D);) alternative tunings (e.g., tenor bass, piccolo bass, and guitar-tuned basses) and 8, 10, 12 and 15-string basses, which are built on the same principle as the 12-string guitar, where the strings are grouped into "courses" tuned in unison or octaves, to be played simultaneously.
Extended Range Basses (ERBs) are basses with between six and twelve strings—with the additional strings used for range rather than unison or octave pairs. A seven-string bass (B0-E1-A1-D2-G2-C3-F3) was built by luthier Michael Tobias in 1987. This instrument, commissioned by bassist Garry Goodman, was an early example of a bass with more than six single course strings. Conklin builds eight- and nine-string basses. The Guitarbass is a ten-string instrument with four bass strings (tuned E-A-D-G) and six guitar strings (tuned E-A-D-G-B-E).
Luthier Michael Adler built the first 11-string bass in 2004 and completed the first single-course 12-string bass in 2005. Adler's 11- and 12-string instruments have the same range as a grand piano. Sub-contra basses, such as C#-F#-B-E ("C#" being at 17.32 Hz (C♯0)) have been created. Ibanez had released SR7VIISC in 2009, featuring a 30" scale and narrower width, and tuned as B-E-A-D-G-C-E; the company dubbed it a cross between bass and guitar. Yves Carbonne developed 10 and 12 string fretless sub-bass guitars.
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