Abstract: A string instrument providing sound amplification without distortions by body formed of a belly and a back connected to each other by a rib such that the belly and the back are disposed at an angle relative to each other and wherein at least one sound opening is provided in the rib at the largest distance between the belly and the back.

Abstract: A musical string instrument (1) having a resonator (3) including a belly (5) and a back (7) connected by a side (9) and provided with a sound hole (17) to resonate vibrations induced in a string (13) strung over at least part of the resonator (3). Within the resonator (3) there is mounted a plate member (19) in a downwardly inclination disposition relative to the belly (5) to divide the interior of the resonator (3) into at least two chambers (21, 23) connected to each other in a region forwardly of a free edge of the plate member (19) to form a sound bell of a width continually increasing towards the sound hole (17) for amplifying low frequency tones and improving bass resonance of the vibrations of the string (13) in the resonator (3).