Rooms & Echoes

Reverberation and concert halls

An interactive lesson with 8 steps, about 7 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Reflections within 0.1 s blend into reverberation; later ones are echoes.
• Sabine: $T_{60} \approx 0.161\,V/A$.
• Concert halls balance volume and absorption to get about 2 s.

Steps

1. Echo or reverberation?
2. A clap in a room
3. Shouting at a cliff
4. A distinct echo
5. Sabine’s formula
6. Design a concert hall
7. An empty hall
8. Doubling up