Exploring Acoustics: The Truth About Noise Reduction Coefficient (NRC)

22 Mar 2021

In the recent years, acoustic design solutions have become a trend in Architecture. More and more architects and designers nowadays are specifying acoustic products as building or interior materials for their architectural design projects. Acoustic products are those ceiling panels or wall coverings that are constructed with sound attenuating materials, e.g. mineral wool, fiber glass, cork, and the likes.


More than the flexibility in design it provides, the rise of acoustic design solutions can be sourced from today’s awareness of its primary purpose - sound absorption. However, along with the overwhelming acceptance of the market, many manufacturers today are citing misleading information about their respective acoustic products’ performances and test results, making it difficult to navigate the best in the sea of available options. Some products are advertised or tested with workarounds to appear more effective while actually having an inaccurate sound absorption rating.


Inewvation International and Arktura would like to share the knowledge needed for further understanding of acoustic design solutions. In this blog, we’re defining NRC and identifying its importance, to help you in making an accurate, informed decision when selecting an acoustic system.



Noise Reduction Coefficient or NRC is an average rating of how much sound an acoustic product can absorb. It typically lies between 0.00 to 1.00. The materials that have a rating of 0.00 are those that reflect all of the sounds that hit it, while the materials that absorb all of the sounds that hit it receives a rating of 1.00. The higher the NRC rating number means the better the acoustic performance a product has.


Aside from NRC, there are additional performance metrics for acoustics set by American Society for Testing and Materials (ASTM), such as STC for sound transmission class and SAA for sound absorption average. However, NRC is an industry-standard in architecture because its focus is on sound absorption coefficients for the four fundamental frequencies of human speech: 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz.


NRC rating evaluations vary from product to product, and configuration to configuration, even within one space. If a certain acoustic product is perforated, installed, or formed in different ways, then the acoustic performance will definitely be different.



The NRC describes the average sound absorption performance of a material. It provides you an assurance that your acoustic products will perform as you need and expect them to. These materials are not just selected because of their designs, but also because they need to meet specified needs.



Arktura’s True NRC™ provides acoustic results that are transparent and accurate.


Born out of its commitment to transparency and accuracy in acoustic design solutions, Arktura developed the True NRC™ rating to help the market achieve a confident understanding of every product’s actual acoustic performance. This includes all acoustic products’ considerations and installation arrangements to provide a number that accurately reflects Arktura products’ acoustic performance.


745x420 Diagram 4


With all the misinformation out there, the real challenge for architects and interior designers has been specifying quality acoustic products for their architectural design projects.


745x420 Diagram 5


Arktura, together with Inewvation International, would like guide you with True NRC™ - making an increased awareness of how beneficial acoustic products are and a confident understanding of actual acoustic performance to make the most strategic selection and most informed purchasing decision.


Under Inewvation International’s Sustainable Building Solutions, Arktura is now available in the Philippines. It offers an expansive library of sound attenuating products for architecture, with high product quality and new standards of design aesthetic and adaptability.


Visit https://arktura.com to know more.