The absorption spectrum is wide and over 500 HZ.High-Density material,which is higher than the industry standard of 30%. The principle of the soundproofing foam is that the sound inside the sponge is repeatedly reflected back and forth, thereby achieving the effect of noise reduction and sound absorption.the acoustic panels not only have effective sound absorption characteristics, but also will not cause any harm to our body.The high quality material studio foam can keep its sound insulation function permanently.
eBay