Soundboard

A sounding-board.

To many a row of pipes the sound-board breathes. Milton.

n. 1. A thin board which propagates the sound in an organ, violin, or other musical instrument.

2Sense 2. A board, or structure with a flat surface, suspended behind or over a pulpit or rostrum to give distinctness and effect to a speaker’s voice.

3Sense 3. (pl.) Boards used in floors for intercepting the passage of sound between the different stories of a building;—called also sound-boarding.