I just watched a Dennis Foley Acoustic Fields video, in which he makes his case against the claims made for Green Glue. I can’t speak to that product, but can to another wall damping material: Wall Damp, made by ASC, Acoustic Sciences Corp., the Tube Trap company. It is a viscoelastic material made to be installed between double layers of sheetrock. I heard a room so constructed employing Wall Damp, that of Audiogon member folkfreak. I rapped my knuckles on the walls of his room, and it was like stone: very close to absolutely non-resonant.
