soundboard; sounding board; resonator
Technical term for a board or plate that resonates to amplify sound, such as in a musical instrument or acoustic device.
The violin's soundboard amplifies the vibrations of the strings.
This speaker uses a wooden sounding board.
Compound of 共鳴 (resonance) and 板 (board, plate). The exact historical derivation is uncertain, but the term is a straightforward technical compound.