If the goal is to stop sound from entering or leaving a space, then you will most likely need sound blocking or soundproofing. For example; your neighbor plays loud music at all hours of the day and night. The sound travels from their space into yours. For example, your team or students have difficulty clearly hearing in the conference room or auditorium during presentations.
Nicole Black — It turned out that their services were not a fit for our situation, but I submitted my request and got a phone call within