Sound tests accoring to SS-EN ISO 354 have made it possible to

divide the fabrics in different audio classes from A-E depending on

how well they absorb sound.



Diagram according to Vilano 



Sound class A-B

Class A αw: 0,9 och 1,0

Class B αw: 0,80 och 0,85

Sound class C-D

Class C αw: 0,60 - 0,75

Class D αw: 0,30 - 0,55 


Sound class E

Class E αw: 0,15 - 0,25  

Studies show inferior work performance in environments where acoustics are poor.
Because of that Almedahls developed already in 2005 a concept for measuring our products acoustic effect. In practice, we measure the reverberation time of sound at different frequency levels. For work environments it is important to reduce the reverberation time, especially for high-frequency sound through our textile products that can be both hanging textiles (curtain), and carpets mounted on wall or floor. Currently we offer about 80 products in hanging textiles that are acoustic-tested. Our carpets are also very effective as sound absorbers.
The sound absorbing effect generally depends on the product's weight and structure. As you can see, we have now divided our sound absorbers for hanging textiles into 4 acoustic-classes to make it easier for you to find the right combination of acoustic power and another function. For example, if you want an excellent sound-absorbing effect in combination with light transmission, we recommend our products in acoustics Class C which corresponding to the isolation of 30-70 mm mineral wool.

Looking for advice on sound absorbers? Please contact our sales consultants who have extensive experience in the use of textiles as a sound absorbent in public spaces.
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