Editing Double bass (section)

==Mechanism of sound production==
Owing to their relatively small diameters, the strings themselves do not move much air and therefore cannot produce much sound on their own. The vibrational energy of the strings must somehow be transferred to the surrounding air. 
To do this, the strings vibrate the bridge and this in turn vibrates the top surface. Very small amplitude but relatively large force variations (due to the cyclically varying tension in the vibrating string) at the bridge are transformed to larger amplitude ones by combination of bridge and body of the bass. The bridge transforms the high force, small amplitude vibrations to lower force higher amplitude vibrations on the top of the bass body. The top is connected to the back by means of a sound post, so the back also vibrates. Both the front and back transmit the vibrations to the air and act to match the impedance of the vibrating string to the [[acoustic impedance]] of the air.