![]() ![]() NRC ratings – Whereas STC ratings are used to demonstrate how much sound is blocked, noise reduction coefficients (NRCs) describe how much sound will be absorbed, which relates to minimizing acoustic effects like echoing.A material’s impact insulation class (IIC) rating will inform you of how effective the material is at stopping this type of noise. IIC ratings – Not all sound is transmitted via the air some is due to the vibrations caused by impacts. ![]()
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