Originally built in 1895 as a masterpiece of spa innovation, the Imperial Spa has been reborn as a vibrant cultural landmark. At its heart lies a modern “music machine,” inspired by the historic “peat machine” once integral to the building’s design. Suspended on six legs within the restored atrium, the multifunctional hall designed by Petr Hájek ARCHITEKTI balances reverence for history with cutting-edge adaptability. This self-supporting structure is a marvel of acoustic and spatial transformation. Rotating panels, retractable sound reflectors, and resonant wooden surfaces adjust effortlessly to suit various events, from concerts to conferences. Bathed in a rich red hue reminiscent of historic theatre curtains, the hall exudes both warmth and drama. Preserving the original architecture while introducing a bold, reversible intervention, the project ensures the Imperial Spa’s legacy endures — reimagined as a space for creativity, connection, and cultural vibrancy.
From the Architects | The historic building of the Imperial Spa, completed in 1895, was remarkable in its time for both its architecture and spa technologies. Architects Ferdinand Fellner and Hermann Helmer incorporated a unique mechanism for processing and distributing peat. The peat was transported by conveyor and elevator from a processing facility to multi-story bathing areas. This efficient system enabled up to 2,000 guests per day to use 100 baths, ensuring a quick return on investment despite the initial budget being exceeded by double.
At the turn of the 20th and 21st centuries, the building was used only occasionally for cultural events and gradually fell into disrepair. A meaningful purpose was sought to justify the costly reconstruction. This situation persisted even during the preparation phase for the building works. Eventually, the investor decided to transform the Imperial Spa into a cultural institution, with a concert and multifunctional hall as its central feature. This hall was located in the building’s core, within the atrium, which had previously functioned as a utilitarian machine room with the peat conveyor.
The historical “peat machine” became the inspiration for our design. Since the restoration of spa operations was not planned and only a few cast-iron columns from the original structure had been preserved, there was an opportunity to introduce a new “machine” – in this case, featuring state-of-the-art scenic and acoustic technology. The hall’s design functions as a “transformer,” capable of adapting spatial and acoustic parameters to the specific needs of each event. The hall can be compared to a “Swiss army knife” offering a variety of functions.
The hall is equipped with elements that adjust reverberation time, as well as the direction and intensity of sound energy. The orchestral shell features a retractable screen that reflects sound towards the audience. Rotating triangular panels above the stage can reflect, absorb, scatter, or direct sound. Wooden panels on a steel framework in the orchestra’s floor serve as resonators, harmonizing with the musicians’ instruments.
The hall is fitted with technology to accommodate concerts, theater performances, dance, conferences, film screenings, and popular music. A heavy blackout curtain allows the space to be completely darkened and acoustically dampened. All scenic and acoustic technologies are integrated into the hall’s structure, while ventilation and fire safety systems are housed in a block above the main staircase roof.
The construction of the hall was challenging, as large structural components could not be transported into the atrium. All parts had to be assembled from smaller elements transported through an opening in the roof.
Photography by Benedikt Markel.
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