Sound boxTo Hear Sound

Sound box is used to hear sound through it and if it contains the amplifier then it can supply the sound loudly.
A sound box or sounding box (sometimes written sound box) is an open chamber in the body of a musical instrument which alters the instrument's tone quality by modifying the way the instrument resonates. Most instruments respond more strongly to vibrations at certain frequencies, known as resonances. The sound box typically adds resonances at lower frequencies, enhancing the lower-frequency response of the instrument.