Design of a sound reinforcement system with acoustic calculations for an assembly hall of a general education institution

Sound reinforcement is also required in assembly halls of schools and other educational institutions. For comfortable perception of the sound signal, it is necessary to make an acoustic calculation of the room, with the selection of acoustic materials to optimize the reverberation time, and the selection of loudspeakers. The reverberation time depends on the volume of the room, the correction is made by selecting facing materials. Without proper facing of the walls and ceiling of the room, a high reverberation time can form, which will lead to large reflections of sound signals, and a small value of the reverberation time leads to excessive muffling of the room. A heavily muffled room worsens the propagation of the sound signal. To optimize the reverberation time, a graph of the dependence of the value on the volume was created, it is displayed in the recommendation SP 51.13330 "PROTECTION FROM NOISE".

Acoustic calculation using EASE software (Enhanced Acoustic Simulator for Engineer, an engineering simulator for improving acoustics) allows changing facing materials in a computer model of an assembly hall to optimize the reverberation time to recommended values. Simulators of acoustic systems are added to the three-dimensional model of the hall, on the basis of which calculations of acoustic parameters are issued, such as: sound pressure, sound pressure with a reflected signal, speech intelligibility, time of arrival of a sound signal to the audience, sound loss coefficient, and others.

Correction of calculations of acoustic parameters depends on the location of loudspeakers and their direction to the audience. The number of loudspeakers is also determined only by electroacoustic calculation. Having received an accurate calculation with the definition of acoustic systems, you can proceed to the next stage of designing the sound amplification system (SAS), namely the selection of additional sound equipment for amplification and control of the sound signal. The choice of amplifiers is based on the parameters of the acoustic systems, resistance power and type of connection. The sound path consists of several mandatory components, including an audio mixing console, equipment for playing phonograms, microphones and devices for processing the sound signal. The latter components are selected based on the tasks that need to be implemented in this hall. There is a need to include radio microphones and players of various CD, USB formats in the assembly halls of educational institutions.