Where do the longest reverberation times tend to be?

• A. Cathedrals and large concert halls
• B. Open fields
• C. Soundproof rehearsal rooms
• D. Small classrooms

Answer: (A)

Reverberation time depends on how much sound energy is reflected versus absorbed in a space, and on the room’s size. Large spaces with hard, reflective surfaces let sound bounce around for a long time before it dies away, so the reverberation lasts longer. Cathedrals and large concert halls fit this profile: they have immense volume, stone or plaster walls, high ceilings, and relatively little soft absorption. In contrast, open fields have no enclosing surfaces to reflect sound, so there isn’t a lasting reverberation. Soundproof rehearsal rooms are designed to absorb sound, dampening reflections quickly, which shortens reverberation. Small classrooms are more compact and often contain materials that absorb sound, also leading to shorter reverberation times.