-> http://hyperphysics.phy-astr.gsu.edu/hbase/Acoustic/revtim.html
Highlights
- RT60: time to drop 60 dB below original level.
- For a general purpose auditorium for both speech and music: 1.5 to 2.5 seconds.
- Longer RT: richer musical sound, more difficulty understanding speech.
- Shorter RT: clearer speech, loss of richness and fullness.
- Reverberation time approximation: Sabine formula, RT60=0.16VSe, Se is the effective absorbing area, a is the absorption coefficient. Se=a1S1+a2S2+a3S3+⋯. -> http://hyperphysics.phy-astr.gsu.edu/hbase/Acoustic/revmod.html#c2
- Examples of reverberation times:
- Vienna, Musikvereinsaal: 2.05 seconds
- Boston, Symphony Hall: 1.8 seconds
- New York, Carnegie Hall: 1.7 seconds