![]() ![]() ![]() Noisier rooms may require a higher NRC rating, or more material. So, what is a “good” NRC rating when looking at acoustical materials? When you want to take meaningful steps to reduce echo and noise in a room, a good starting point would be materials with NRC ratings above 0.7. This is where acoustical products designed to effectively absorb sound, thus having a high NRC rating, are necessary. However, carpet alone is usually not enough to reduce echo and reverberation to a desirable level, or it may not be feasible to use it in a space, like in a gymnasium. For example, carpets have a relatively low NRC rating (0.15 – 0.30) but often cover an entire floor, which can have a large influence on reducing sound reflection strength within a room. It also matters how much of that material is present. It’s not as easy as saying the higher NRC rating the better. S tandards organizations are currently engaged in researching changes needed for the Noise Reduction (and Absorption) Coefficient methodologies to be more accurate for all cases of product ratings. The perimeter and thickness of the material being tested will cause an “edge effect” (diffraction), which can result in errors in the calculation used to arrive at the NRC rating, yielding results above 1.0. This doesn’t mean that the material can absorb more sound than that arriving at the material instead, it’s an issue with the testing standards used to determine the NRC rating. However, you may come across materials with NRC ratings higher than 1.0, which can be confusing. A 1.0 rating might represent something like an open window, where all the sound passes through the window opening and doesn’t reflect back into the space. A 0.0 rating might represent something like a smooth-finish concrete wall, where sound is completely reflected off the surface. NRC ratings vary from product to product and are affected by the type of absorbent material, its thickness, its density, and its mounting method.īy definition, the NRC rating is a mathematical coefficient and should range only from 0.0 to 1.0. The purpose of an NRC rating is to provide a simpler way to determine how well an acoustical product absorbs mid-range sound (generally thought of as the range of speech frequencies). What is an NRC rating and what does it stand for?Ī Noise Reduction Coefficient – commonly known as NRC – is a single number rating which represents the average of sound Absorption Coefficients of a material at specific mid-range frequencies (tested at 250, 500, 1,000, and 2,000 Hz octaves). Whatever project you’re thinking about, understanding what an NRC rating is and how it works will help you find the best acoustical product solutions you’ll need. Maybe you are trying to improve the acoustics at your workplace so people can concentrate more easily. Perhaps you’re starting a podcast or building a sound studio in your home. If you’ve found yourself looking into NRC rating, there’s a good chance you’re working on a project that requires sound absorption to reduce echo and reverberation in a room or space. Posted by AcousticalSurfaces on 2:09 pm | Leave a Comment NRC Rating 101 – Understanding the Noise Reduction Coefficient ![]()
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