Modern cinema demonstration technologies have changed the perception of the auditorium space. Multi-channel digital stereo demonstration, the use of mobile platforms for seating created conditions for the design of small-capacity auditoriums with a round plan shape. Wall enclosing structures in this case have the shape of the inner surface of the cylinder. Finishing with acoustic plates on the frame is time-consuming and does not always allow you to repeat the shape of the fence. The design of acoustic decoration of cinema halls with a round or oval shape of the plan is rationally carried out with the use of acoustic foam "Flexacoustic" on the walls and Soundec ceiling panels (Soundec). The most effective combination, providing uniform sound absorption in frequencies, was obtained by using acoustic foam rubber "Flexacoustic" with a density of 30 kg/m3 and wood panels "Soundek" with a density of 450 kg/m3 with internal filling plates "Acoustic Fiber". The study of the use of domestic materials that are convenient for finishing works and recommendations for the choice of rational use, different in properties of acoustic building systems, allowed us to obtain results that will ensure the best conditions of audibility in the cinema hall.

Keywords: cinema, auditorium, room acoustics, sound-absorbing materials, sound absorption coefficient, average geometric frequency, soft acoustic plates