A thermoformable acoustic sheet formed by a compressed fibrous web includes high melt fibers and adhesive thermoplastic fibers in which the adhesive fibers are at least partially melted so that in the compressed web the adhesive fibers at least partially coat the high melt fibers and reduce the interstitial space in the fiber matrix. Also included are methods of producing a thermoformable acoustic sheet which includes heating a fiber web including high melt and adhesive thermoplastic fibers to at least partially melt the adhesive fibers and compressing the web to form a sheet so that the adhesive fibers at least partially coat the high melt fibers to reduce the interstitial space in the fiber matrix.