The only difference between steel string guitar and the acoustic bass guitar is there will be a big hollow inside the wooden body of the normal guitar. As the sound produced by this is very low, there is a built in sound amplification mechanism along with each acoustic bass instrument. Acoustic bass came into existence from the mid 20th century and came as a successor to electric bass instrument. The acoustic bass are fretted and consists of a small metal bar which produces the desired pitch when the string is stopped by the finger at the metal bar. Like electric bass guitar, the acoustic bass guitar also has 4 strings tuned to E-A-D-G. It is not possible to produce the resonance at lower B because of the size of the instrument. In that case an extra high string is added.
The acoustic bass instruments are generally used in Mexican music and acoustic music performance. Baja Sexton and Guitarron are some of the bass instruments used. Enjoy the melody loops acoustic bass music loops.