Sound waves reflect off hard walls and lose energy at absorptive surfaces. The Sabine equation estimates how long a room "rings" after a sound stops.
RT60 = 0.161 · V / (Σ α·S)
- Room size — sets the floor plan's width/depth (2.8 m ceiling assumed); bigger rooms need more absorption for the same RT60.
- Absorption panels — fraction of wall area treated with absorptive foam (raises average α, shortens RT60).
- Wavefront particles — number of simulated sound rays bouncing between walls (visual density only).
- Source mode — pulse emits one burst to watch decay; continuous keeps re-emitting for a steady-state view.
Real-world use: acousticians use RT60 targets (~0.4-0.8s for classrooms, ~1.8-2.2s for concert halls) to size absorptive treatment during studio and auditorium design.