Speaker cloth or speaker fabric (itâ??s also referred to as grille cloth, acoustic cloth, or speaker mesh) is specifically designed to allow for easy sound transmission through the material. The thing isâ??just about all fabric will let some sound through (called sound transmissibility), but speaker fabric is specially made to equally allow all frequencies through from 20Hz to 20 kHz. It also is available in a variety of colors to match the aesthetics or look a loudspeaker manufacturer (or interior designer) is trying to achieve.