Music Production
Convert RT60 decay time into milliseconds and samples.
Useful for reverb tails and impulse responses.
Reverb decay time measures how long reverberation continues after the original sound stops. It's a critical parameter in audio engineering that determines the 'liveness' of an acoustic space or digital effect. Decay time affects how natural or artificial a reverb sounds and influences the perceived size and character of a space. Short decay times (0.5-1.5 seconds) simulate small rooms and intimate spaces, creating clarity and punch in recordings. Long decay times (3-5+ seconds) simulate large halls and churches, adding grandeur and sustain to instruments. Understanding decay time helps producers choose appropriate reverb settings for different instruments and genres, ensuring vocals sit properly in a mix and instruments blend naturally without sounding washed out or overly dry.
Reverb decay time is calculated based on room dimensions, absorption coefficients of materials, and the frequency being measured. The calculator uses the Sabine formula, which accounts for volume and surface absorption. You input room length, width, and height, then select materials (drywall, carpet, foam, glass) for each surface. The calculator estimates decay times at different frequencies, as reverb typically decays faster at higher frequencies. Results show how long sound takes to drop 60 dB (RT60 standard) below its initial level, providing a clear measure of reverberation characteristics.
RT60 = 0.161 × V / (A × c), where V is room volume in cubic meters, A is total absorption area, and c is speed of sound. The calculator iterates through frequency ranges, applying absorption coefficients for each frequency band to account for realistic frequency-dependent decay.
RT60 (reverberation time at 60 dB) is the standard measure of decay time used in acoustics. It measures how long sound takes to drop 60 dB below its initial level. All decay time references typically use RT60.
High-frequency sounds are absorbed more readily by materials and air than low frequencies. This means high frequencies decay faster, creating a natural 'darkening' of reverb over time that matches real acoustic spaces.
Match decay time to your song's tempo and style. Generally, faster songs work with shorter decay times (0.5-1.5s), while ambient or orchestral music benefits from longer decay times (2-4s). Shorter times keep mixes clear; longer times add space and sustain.
Yes, using a sound level meter and tone generator, you can measure your room's actual RT60. Play a 1 kHz tone for several seconds, stop, and measure how long it takes to drop 60 dB. Real measurements are more accurate than calculator estimates.
