In the mid of 2020, ALTA Integra was chosen by the Indonesia Stock Exchange to handle the acoustic, audiovisual, and lighting design to elevate IDX Main Hall to World-Class Standard. For the acoustics treatment, we proposed to replace some materials within the room to reduce the reverb time of the main hall that did not comply with the standard. The suggested material had been considered and designated to blend with the interior design. Thus the theme and look of the auditorium would not change.