In the event of an emergency, the DSO (Voice Evacuation System) plays an important role in evacuations and must operate efficiently, including in underground garages. To operate efficiently means, first of all, it must be audible and intelligible. For this purpose, appropriate adjustment and placement of loudspeakers is used, as well as additional acoustic adaptations of the space to increase the acoustic absorption and intelligibility of human speech.

In the underground garages of the Pogoń Szczecin football club stadium in Szczecin, Sonaspray® K-13 Standard acoustic plaster was applied to the entire ceiling. The fastest and least problematic solution in execution. With the ceiling almost empty, workers can even perform the work at a rate of about 300-400m2 per day.