RT60
0.68s
Volume
85 m³
Absorption
20 sabins
Reverberation Time (RT60)
0.68s
Good for speech and small rooms
Volume
85 m³
Absorption
20
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Inputs
Result
Volume = 6.1×4.6×3.05 = 85.6 m³. Total absorption = walls × 0.05 + floor × 0.55 + ceiling × 0.05 = 26.6 sabins. RT60 = 0.161 × 85.6 / 26.6 = 0.52s.
Inputs
Result
Concrete α = 0.02. Very reverberant, needs significant acoustic treatment for music use.
RT60 is the time for sound to decay by 60 dB after the source stops. It determines how "live" or "dead" a room sounds. Studios aim for 0.3-0.5s. Lecture rooms need 0.6-0.8s. Concert halls are 1.5-2.5s.
| Room Type | Ideal RT60 | Volume | Treatment |
|---|---|---|---|
| Vocal booth | 0.2-0.3s | <50 m³ | Heavy absorption |
| Control room | 0.3-0.5s | 50-150 m³ | Balanced absorption |
| Classroom | 0.6-0.8s | 150-500 m³ | Ceiling panels |
| Concert hall | 1.8-2.2s | >5000 m³ | Diffusion + reflection |
RT60 = 0.161 × V / A, where V = room volume (m³) and A = total absorption (sabins). Absorption = sum of each surface area × its absorption coefficient (α). Higher α means more absorption.
Room modes are resonant frequencies determined by room dimensions. The first axial mode = 343/(2×L) Hz where L is the dimension in meters. A 6m room has a first mode at 28.6 Hz. Modes cause bass buildup at certain frequencies.
Add absorptive materials: acoustic panels (α = 0.85), heavy carpet (α = 0.55), thick curtains (α = 0.50). Focus on first reflection points. For bass, use corner bass traps. 2" panels absorb 500+ Hz; 4" panels absorb 250+ Hz.
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Last Updated: Mar 26, 2026
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