Auralex Audio Engineers 9-Piece Acoustic Pack This package of ISO Series products is specially designed for Audio Engineers and home recording enthusiasts to improve the quality of your sound in any recording or listening space. CAUTION: walls and ceiling s will need to be sanded and repainted after removal of Studiofoam. Isolates directional microphones from off axis coloration. Limits external bleed from unintended sound sources. Mechanically isolates stand mounted microphones from the floor or stage they are resting on.