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Acoustic guitar

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An acoustic guitar is a musical instrument within the string family. It relies on physical vibrations to create sound rather than electronic amplification. This distinction is why the term "acoustic guitar" is often used as a retronym. It helps people differentiate these instruments from electric guitars. The instrument is prized for its unique timbre, which is the specific quality or color of its sound.

Acoustic guitars in store 20180625
Acoustic guitars in store 20180625

The mechanism of sound production involves several complex steps. When a musician plucks a string with a fingertip or a plectrum, the string vibrates. This vibration travels from the bridge to the top of the instrument. The top acts as a soundboard, which is a large, flat surface. The soundboard performs a process called mechanical impedance matching. This allows the large surface to move the air much more easily than a thin string could. The vibration also travels to the sides and back of the body.

Pattern on Acoustic Guitar
Pattern on Acoustic Guitar

The hollow body of the guitar serves as a sound box. This cavity contains air that resonates with the vibrations of the strings and soundboard. This interaction can act like a Helmholtz resonator. This is a device where air vibrates in or out of a hole. Depending on the phase of the movement, the sound can change. When the air moves in phase, the volume increases by about 3 decibels. If the air moves in opposing phase, the volume decreases by about 3 decibels. The sound eventually exits the instrument through the sound hole.

Ovation acoustic guitar
Ovation acoustic guitar

The history of the guitar traces back to Spain in the early 16th century. It likely derived from an instrument known as the guitarra latina. During the Spanish Middle Ages, small instruments called gitterns were played.

Dusepo gittern
Dusepo gittern

These early instruments often had round backs similar to a lute. By the Renaissance, the vihuela became a common string instrument in Spanish culture. Some vihuelas were played with a bow, while others were played by hand. These were known as the vihuela de mano. By 1790, six-course vihuela guitars were the primary model in Spain. These used six unison-tuned pairs of strings.

Modern guitar construction was shaped by several key innovators. Around 1850, the Spanish maker Antonio Torres Jurado established the modern form. He increased the body size and altered its proportions. He also utilized fan bracing to support the instrument. Bracing refers to the internal wood reinforcements that prevent the top from collapsing. This design improved volume, tone, and projection. Later, the firm C.F. Martin introduced steel strings to increase loudness. This required adding a steel truss rod to the neck for stability. These changes allowed guitars to compete with banjos in jazz bands.

Today, acoustic guitars are categorized by their string types and body shapes. Nylon-string guitars include the classical guitar and the flamenco guitar. Steel-string guitars include the western or folk guitar.

Acoustic guitars in store 20180625
Acoustic guitars in store 20180625

There are also many specialized shapes. A parlor guitar is small and produces a delicate tone. A grand concert shape is mid-sized and useful for recording. The dreadnought is a much larger body style.

Body Shape Guitars
Body Shape Guitars

This larger size helps produce a greater volume of sound.

Technology has also changed how these instruments are amplified. While they are acoustic, many are now "acoustic-electric" guitars. These use pickups to connect to amplifiers. Piezo pickups are often mounted under the bridge saddle. Magnetic pickups are sometimes placed in the sound hole. In the 1960s, the company Ovation introduced parabolic bowls to reduce audio feedback. Feedback is a common problem when amplifying acoustic instruments. Some models, like the Adamas, used carbon-based composites to create many small sound-holes. This helped increase volume while further reducing feedback issues.

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🖼️ Images & Media (5)
File:Dusepo gittern.jpg
Dusepo gittern.jpg
File:Ovation acoustic guitar.jpg
Ovation acoustic guitar.jpg
File:Pattern on Acoustic Guitar.JPG
Pattern on Acoustic Guitar.JPG
File:Acoustic guitars in store 20180625.jpg
Acoustic guitars in store 20180625.jpg
File:Body_Shape_Guitars.jpg
Body_Shape_Guitars.jpg
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