NRC Data (Noise Reduction Coefficients)

Noise Reduction Coefficients classes are designated A to E. Class A has the highest sound absorption and E the Lowest. In addition should also show the specified overall dept of system (o.d.s), this must always be stated for a given sound absorption class.

The ASTM standard C 423 specifies two different single values of sound absorption; the NRC (Noise Reduction Coefficient) and the SAA (Sound Absorption Average). Both values are calculated as an average over the frequency ranges (250-2000 Hz and 200-2500 Hz respectively).

But the Noise Reduction Coefficients is not the whole story. It just gives an overall indication to the materials absorption properties. In the case of acoustically treating a room you may need to be more selective than this. The document where the NRC data is derived from will also show the materials absorption at many different frequency responses. This is where you can see what the material will do at the frequencies you need to tackle.

In the case of acoustically treating your room you may not always want a highly absorbing foam tile. For example if you want to take some reverberation out of the room, yet still keep some liveliness, a thin foam tile with a class D rating might be just what is needed to take the highs out. A general rule is the thicker the tile the better it will deal with mid’s and lows. However highs will be dealt with just as well using a thin tile.

NRC Test Results

Below are the detailed independent NRC test results for our acoustic foam tiles and bass traps just click on the text to download the document.


Image of one AFW305 tile

AFW305/AFW45 – 45mm Wedge Tile

NRC 0.55 (55%) Class D

AFW100 – 100mm Wedge Tile

NRC 0.75 (75%) class C

AFW100 tile singular

Single AFP305 tile

AFP305/AFP45 – 45mm Pyramid Tile

NRC 0.50 (50%) Class D

AFP100 – 100mm Pyramid Tile

NRC 0.85 (85%) Class C

Single AFP100 tile

front view of AFBT02 bass trap

AFBT02 – Bass Trap

NRC 1.50 (150%) Class A

AFBTX – Bass Trap

NRC 1.45 (145%) Class A

front view of AFBTX

Single BLOCK45 tile

BLOCK45 – 45mm Block Tile

NRC 0.70 (70%) Class D

BLOCK75 – 75mm Block Tile

NRC 0.95 (95%) Class A

Single Block75 tile

Single Block100 tile

BLOCK100 – 100mm Block Tile

NRC 1.15 (115%) Class A

Social media & sharing icons powered by UltimatelySocial