KATER BLAU

About the Project
Kater Blau was founded in 2014 as the successor to KaterHolzig, which in turn grew out of Bar25. The club is located directly on the banks of the River Spree and is therefore closely connected to the history of Berlin’s club culture.

Initial Situation
As new buildings were constructed increasingly close to the club, Kater Blau faced growing numbers of complaints from the surrounding neighborhood. The ongoing conflict led to stricter demands from the environmental authorities. The building authority even threatened to close the club.

Measures

1. Soundproofing in the Acid Bogen
In the Acid Bogen, modal vibration absorbers were installed on the rear wall of the stage and on the opposite wall surface. In addition, broadband absorbers were installed in the soundproofing vestibule, together with an active noise cancellation (ANC) system in the vestibule and on the emergency exit door.

2. Directional Low-Frequency Sound
The low-frequency sound system was expanded with a cardioid extension. This was intended to reduce sound immissions, particularly towards the northern side.

3. Soundproofing on the Hoppa Floor
Modal vibration absorbers were also installed on the rear wall of the stage and on the opposite wall surface on the Hoppa Floor. In addition, an ANC system was installed in the soundproofing vestibule and on the emergency exit door and extended to address further structural weak points.

Result
The combination of active and passive soundproofing measures led to a significant reduction in sound immissions, particularly at the points where sound could escape. The changes were measured during the programming of the ANC systems.