What is the average RT60 in a classroom?

What is the average RT60 in a classroom?

• A. 0.4 to 1.4 s
• B. 0.2 to 0.6 s
• C. 1.6 to 2.0 s
• D. 0.6 to 1.0 s

Answer: (A)

RT60 is the time it takes for sound to decay by 60 dB after the source stops. In a classroom, how long that decay takes depends on room size and how much sound-absorbing material is present—carpets, curtains, acoustic panels, and even furnishings all dampen reflections. Smaller, well-damped rooms can have much shorter reverberation, around 0.4–0.6 seconds, while larger or more reflective spaces can extend toward 1.0–1.4 seconds. When you look at typical classrooms overall, the range most representative of real-world variation runs roughly from about 0.4 to 1.4 seconds. This is why that option is the best pick: it covers the common spectrum of classroom environments from quieter to more reverberant spaces. The other ranges either miss the lower end, miss the upper end, or are too narrow to reflect how much classroom acoustics can vary.

RT60 is the time it takes for sound to decay by 60 dB after the source stops. In a classroom, how long that decay takes depends on room size and how much sound-absorbing material is present—carpets, curtains, acoustic panels, and even furnishings all dampen reflections. Smaller, well-damped rooms can have much shorter reverberation, around 0.4–0.6 seconds, while larger or more reflective spaces can extend toward 1.0–1.4 seconds. When you look at typical classrooms overall, the range most representative of real-world variation runs roughly from about 0.4 to 1.4 seconds. This is why that option is the best pick: it covers the common spectrum of classroom environments from quieter to more reverberant spaces. The other ranges either miss the lower end, miss the upper end, or are too narrow to reflect how much classroom acoustics can vary.