Frequenty Asked Questions
SIS (Swedish Standards Institute) is a member-based, non-profit association specialized in national and international standards. The market leader in standards in Sweden, SIS is recognized for its professionalism, expertise and openness in relation to customers, employees, suppliers and partners. Read more about it here
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Sabine's reverberation equation was developed in the late 1890s. It established a relationship between the Reverberation time of a room, its volume, and its total absorption (in sabins).
The total absorption in sabins (and hence reverberation time) generally changes depending on frequency (which is defined by the acoustic properties of the space). The equation does not take into account room shape or losses from the sound travelling through the air (important in larger spaces). Most rooms absorb less sound energy in the lower frequency ranges resulting in longer reverb times at lower frequencies.
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