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acoustic guitar works on acoustic methods in order to project the strings sound. These guitars were invented after the electric guitars. The Principle - We electric guitar all know that in all different kinds of guitars, the sound is produced by the string vibration, but as the strings can displace only a small air amount, the sound volume has to be increased so it can be heard. When we talk about an acoustic guitar, this part is accomplished through a soundboard and a sound box. The guitar body is hollow and the strings vibration drives its soundboard through the bridge (it makes it vibrate). The soundboard of an acoustic guitar has a larger area and has a larger air volume that produces a louder sound compared to the strings. When the soundboard vibrates, it produces sound waves from both the front and back sides. The sound box of an acoustic guitar provides the sound board a support and a resonant cavity and reflector for the sound waves produced on the back face of the soundboard. The air in this sound box resonates with the vibrational modes of the string increasing the sound volume again. The guitars back also vibrate to a lesser extent, due to the air in the sound box. Invention of Acoustic Guitar - The first acoustic guitar was invented by an Italian Gaetano Vinaccia in 1779. It has become popular since then. Today, a large number of music loving people practice music with cheap acoustic guitars. A distinct form of acoustic guitars is acoustic bass guitars, electric guitars for sale this is a bass instrument that has a hollow wooden body similar to a steel-string acoustic guitar. Alike the electric bass and the double bass, this guitar has four strings, which are normally tuned E-A-D-G, an octave below the lowest four strings of the 6-string guitar, which is the same tuning pitch as an electric bass. Low Priced Acoustic Guitars - People like to play guitars, but not every one can afford to buy expensive musical instruments. For this, there are several sources to get an acoustic guitar for low prices. Buying cheap acoustic guitars or used acoustic guitars are not a difficult thing to do, but you should take care of certain things when you buy acoustic guitar. Keep in mind that the price of a musical instrument depends on the materials used to build it. The biggest cost is the wood in a cheap acoustic guitar. If you want to know more details about the item, you can get it at : http://www.electric-guitar-guitar.com/ Thanks for you reading.