Even though STC and SRC show how properly noise passes via diverse elements, NRC (Noise Reduction Coefficient) steps how nicely products cease sound from reflecting (just how much sound they're able to soak up). The NRC is The share of sound that a surface absorbs (Quite simply, hits a floor https://elliotgmrvx.blogoxo.com/32074263/the-best-side-of-acoustic-performance