How long should my impulse response be?

Capture at least about three times the expected T60 so the full decay is included.

RT60 Measurement Planner

Schroeder frequency, recommended measurement positions, and minimum IR length.

Length (m)

Width (m)

Height (m)

Estimated T₆₀ (s)

How the RT60 measurement planner works

From room dimensions and an estimated T₆₀, the calculator derives Schroeder frequency, suggests how many source-receiver positions to use, minimum impulse-response length, and a practical grid spacing for in-room measurements.

Key terms

Impulse response (IR) - recording used to measure decay; should be long enough to capture full reverberation (often ~3- T₆₀).
Schroeder frequency - boundary between sparse low-frequency modes and denser statistical behaviour.
ISO 3382 - standard family for measuring room acoustic parameters in situ.

Frequently asked questions

How long should my impulse response be? Capture at least about three times the expected T60 so the full decay is included.