What is NRC?

In the simplest possible terms, an NRC (or Noise Reduction Coefficient) is the number that represents the effectiveness of a material at absorbing sound. The NRC is a single-number determined in a lab test and used for rating how absorptive a particular material is. This industry standard ranges from 0 to 1*. It is simply the average of the mid-frequency sound absorption coefficients (250, 500, 1000 and 2000 Hertz).

*Based on the testing methodology, and depending upon the material's shape or surface area, some products can test at an NRC above 1.

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