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Kalistratov Group contacted us about the renovated restaurant at their head office. The room is used every day for staff lunches and for company events. It had no acoustic treatment and had an annoying “echo”: with a full room, conversation at the table became difficult.
On the day of the enquiry we sent catalogues, and on the next working day we showed the panels to the client. At the site visit we took the room’s dimensions and brought samples of the two shapes the architects had chosen.
We built a computer model of the room with all the furniture – tables, chairs, flooring, glass surfaces – and with 50 seated people, to see the room at full occupancy. We compared the result with three standards for rooms where people stay: the Austrian ÖNORM B 8115-3 and OIB-Richtlinie 5 and the German DIN 18041 (group B3). Under ÖNORM B 8115-3, 25 m² of panels bring the reverberation time down from 0.75 to 0.50 s at 500 Hz and from 0.73 to 0.48 s at 1000 Hz. According to the three standards, the required area is between 25 and 35 m².
The architects were choosing between two shapes, so we made a 3D visualisation of both options. The deadline was under a month – the room had to host the company’s winter party. We produced about 100 Senza panels – strips and circles – in 7 days and installed them in 2 days. The panels are our own production.
The “before” and “after” values above are calculated with the model, not measured.
Similar problem? See Acoustics and Soundproofing for Public Buildings or contact us via the enquiry form.
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