Telephone booths for confidential calls in office spaces

The task was to create telephone booths for confidential calls. A logistics company with several open plan offices needed aereas where the employees can telephone without the colleagues maybe listening. It seems to be a simple task for an acoustic engineer to define the requirements in absorption and sound insulation. But a box only designed under acoustical aspects might not suit the needs of the users. Hence an architect, a psychoacoustician and an engineer jointly worked together in designing a prototype. The users were interviewed inside of the booth. The design was dicussed and agreed with these local experts. Important changes were made. The resulting booths are well accepted and commonly used.