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Sometimes an average is not enough

Low-frequency sound can have a major negative impact on students and teachers' work days. It not only blurs speech and makes communication much harder. It also makes students and teachers lose focus and become tired.

Therefore, it is important to reduce these kind of sounds in order to create a good sound environment for teaching and learning. To do this, one must consider the type, amount and positioning of the absorption material. But in order to make the right choice, it is also important to consider the method used to assess the performance of the absorber.

An acoustic panel's sound absorption performance can be measured and presented in different ways. Two common methods are NRC and sound absorption classes.

NRC is measured at 250, 500, 1000 and 2000 Hz and is presented as a value between 0 and 1, or 0 and 100%. Absorption classes include a broader range of frequencies, measured from 250 to 4000 Hz, and are presented in classes ranging from A to E. Absorption classes graphically show how the panels perform in each frequency, whereas NRC displays an average.

 

Absorption classes graphically show how the panels perform in each frequency, whereas NRC displays an average.

 

Since NRC only shows an average, a panel can have a high NRC value but still have a poor ability to absorb low-frequency, making it unsuitable for spaces that needs low-frequency absorption. Absorption classes can in this case provide more  of how the absorber performs at the different frequencies.

Do you want to know more?

Or if you want help, guidance or inspiration to support the creation of a good sound environment, please contact our acoustic expert. Just fill in your contact information and questions below and we will get back to you!

 

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 Saint-Gobain Ecophon AB
 5th Level, Leela Business Park,
 Andheri Kurla Road,
 Andheri (E) 
 Mumbai - 400 059
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Contact us

Phone:
+91 22 40212121
Fax:
+ 91 22 40212392
   
Address:
 Saint-Gobain Ecophon AB
 5th Level, Leela Business Park,
 Andheri Kurla Road,
 Andheri (E) 
 Mumbai - 400 059
 INDIA