How is NRC different from STC?

The key difference between NRC and STC is that NRC is used to rate materials that absorb sound, while STC is used to rate materials that block sound. The design of Snowsound® Acoustic Panels to absorb sound rather than eliminate sound was intentional: the panels purposefully allow some of the high frequencies to persist, in order to keep the acoustics balanced and prevent the muting of these essential sounds. The goal of Snowsound® is therefore not to eliminate sound, but to clarify it and enhance it, to make for a more pleasant and comfortable acoustic environment.

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