SP395 SoundPro Audio Integrator Form7492 Operation Manual
49
This should produce a Decay Range reading of at least 26 dB. The greater the decay range
the more accurate is the extrapolated RT60 measurement. You may find that low frequency
room noise does not make it possible to achieve a 26 dB range in the lowest octave bands.
7. Run. Upon setting the maximum pink noise level the test begins to “RUN”. The pink
noise generator cycles on and off as readings are taken. The “Range” column displays the
decay range obtained for each octave band. The “Decay Time” column displays the actual
time in milliseconds for the sound field to decay by the decay range amount. The RT60
time column shows the extrapolated time for the sound to decay in the room for each
octave band, if a full 60dB decay range were available.
8. Stop. To stop the analysis and freeze the current test readings, change the test control
mode from “Run” to “Off”
Note: When looking at reverb times, keep in mind that low frequency energy can vary quite a
bit and still be inaudible to the human ear. This can cause the results to vary in the lower
octaves. Sources of low-frequency sound include heating and air-conditioning systems,
traffic, and even people walking in other parts of the building.
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