This is a new type of indoor soundproofing panel that combines sound absorption and sound insulation. Just attach it to a wall or other for an effective soundproofing effect. Recommended for those who are concerned about machinery and other places such as rooms that play musical instruments and other homes. Not only is it the most annoying high-frequency area (2 KHz - 5 KHz), it also has excellent sound insulation against less than 2 KHz which is difficult to soundproof.
Note: Does not have effect on heavy bass. This product is not completely block or silent.