sounding board

1. A thin board that forms part of the resonating chamber of a musical instrument and serves to reinforce its sound.

   (music) resonator consisting of a thin board whose vibrations reinforce the sound of the instrument

2. A structure that reflects sound towards the intended listeners. Abatsons.

3. (broadly)Any device or means used to spread an idea or point of view.

4. A person, or group, whose reactions to a new idea or proposal serve to assess its acceptability.

   a person whose reactions to something serve as an indication of its acceptability

regular

• sounding-boardalternative