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Now you can have an RT60 measurement tool for the iPhone. Another in the series of acoustic analysis and test applications from Studio Six Digital, RT60 measures reverb decay time for each octave band, 31Hz - 16kHz, by pulsing pink noise on and off, filtering the incoming signal by octave band, and measuring the timing of the decay of each octave band.

RT60 will measure down to 50ms, and up to 4 seconds. Results are displayed for each band above the band, and the overall RT60 is calculated and displayed on the top of the screen.

RT60 requires at least 24dB of headroom between the noise floor of the environment, and the level of the pink noise. Turn up the amplifier to get more headroom.

To use RT60, connect the iPhone output to the input of an amp and speaker, and carefully turn up the level after you tap the Play/Pause icon. RT60 smoothes the results of several readings to get a more stable result.

*** Screen Graphics

The yellow bars are the current SPL level for each octave band. The thin red bars show the most recently measured maximum dB level for that octave band that the RT60 calculation is using. The thin green bars show the most recently computed minimum dB level that is being used. The vertical red or green bars show the decay range that is available. If the bar is green, the decay range is sufficient for the RT60 calculation. If the bar is red, there is not enough decay range available -- either increase the pink noise level, or lower the ambient noise level. Note that in some situations, you may not be able to overcome the ambient noise level in the room to get a good reading in every band.

*** Calculations

If a valid RT60 time can be computed, it is shown above the thin red (max) bar. If it cannot be computed, no value is shown.

The overall dB calculation averages the decay times for all octave bands with valid RT60 times.

When your analysis is complete, you can save the graph image to your photo roll to include in a report.

*** Calibration & Microphone

Like all of the Studio Six Digital apps, RT60 can be calibrated. The calibration is on the flipside screen. We set this field to the typical iPhone value, but if you have access to a calibrated SPL meter you can adjust this number as needed.

There is a field to select Internal or External microphone. When Internal is selected, a compensation network is used to compensate for the response of the built-in or headset mic. When External is selected, no compensation is done.

See our web site for more detailed information.

Also, check out our other great audio and acoustics apps: SPL, RTA, ETC, FFT, Generator, and Speaker Pop.

And, if you are looking for a great range of high-quality, professional, audio test equipment, check out They sell the current versions of the Audio Toolbox, as the SoundPro line of audio test equipment.

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