What term describes a channel used to simulate the sound of thunder by running a cannonball through it?

The term that accurately describes a channel used to simulate the sound of thunder by running a cannonball through it is the "Thunder sheet." This device consists of a large sheet of metal or material that, when struck or manipulated, produces a sound similar to that of rolling thunder. The physical movement of the cannonball within a channel creates a resonant sound that mimics the rolling sound of thunder, which is why it is often employed in theatrical productions to add realism to storm effects.

Understanding sound effects in theatre involves recognizing how various tools and techniques can replicate natural phenomena. The thunder sheet’s function is specifically designed to create atmospheric audio experiences, making it an essential element in sound design for stage performances.