Noun
sound box (plural sound boxes)
(music) The open chamber (resonator) of a stringed musical instrument, which intensifies its tone.
Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. Source: Internet
It originally served to conduct actual sound waves from a purely mechanical "pickup" called a sound box or reproducer to a so-described "amplifying" horn. Source: Internet
His version of the instrument replaced the gourd with a drum-like sound box and included four full-length strings alongside a short fifth string. Source: Internet
The drum-like sound box on the banjo made it louder than the acoustic guitars that were common with early jazz bands, and banjos were popular for recording. Source: Internet
On acoustic instruments, the bridge performs an equally important function of transmitting string energy into the "sound box" of the instrument, thereby increasing the sound volume. Source: Internet