RT60 is a standard measurement used to specify the time it takes for a reverb sound to decay by 60 dB. In general here is a common reference for RT60 times:
For example, if you were to clap your hands in a generic large hall and it takes 2.5 seconds for the early reflections to decay to a level of -60 dB, then we can say the RT60 has a time of 2.5 seconds (or 2500 ms).
| Space | Time |
|---|---|
| Generic room | 0.8 seconds (or 800 ms) |
| Generic medium hall | 1.2 seconds (or 1200 ms) |
| Generic large hall | 2.5 seconds (or 2500 ms) |
For example, if you were to clap your hands in a generic large hall and it takes 2.5 seconds for the early reflections to decay to a level of -60 dB, then we can say the RT60 has a time of 2.5 seconds (or 2500 ms).
