Monthly Archives: July 2012

Sound class and weighted alpha

19 July 2012 | Category: Uncategorized

As well as ASTM has its terminology on how to express the absorption of materials and how to define this, the International standardization organization ISO got one as well. When ASTM talks about NRC to express the sound absorption of a material, ISO talks about Sound class and weighted alpha. NRC is explained in a […]

NRC, weighted alpha value, sound absorption class, what does it really mean? pt 2

2 July 2012 | Category: Interesting facts, How does it really work, Interesting facts, How does it really work

Acoustical ceilings are very often accompanied by mystic terms and expressions but what is really the practical use of all these expressions and how do i know how it will affect my sound environment. In the previous post we tried to explain Sound absorption. If you missed it, catch up here. Let’s see if we […]