Acoustic treatment has been realized in the hall of Regional Flight Control Center in Zagreb, Croatia, upon complaints made by the flight control operators working in the mentioned hall. The primary complaint was that the operators could hear each other too well across the hall, due to unwanted reflections, so the main task was to reduce those reflections. The emphasis was also made on reducing the reverberation time of the hall, proven to be too long for the size and intended purpose of the hall, thereby reducing the background noise level in the hall as well.
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