Though STC and SRC suggest how perfectly noise passes by way of different products, NRC (Noise Reduction Coefficient) measures how properly products quit sound from reflecting (just how much sound they will take in). The NRC is the percentage of sound that a floor absorbs (Basically, hits a surface area https://quiet-living05059.blogvivi.com/32503985/double-glazing-benefits-things-to-know-before-you-buy