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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Acoustic Facts main location is in Sweden but we work all over the world. Our goal is to be able to help customers all over the world to get a sustainable sound environment.  To find a contact person in your country please go here.  If you can't find and contact person in you country please email your inquiries to us and we will get back to you as soon as possible.  

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