What is acoustic design of an assembly hall?

We are talking about determining the ratio of the total volume of the room, its shape, internal contours and the number of regular visitors. Based on the results, documentation is generated, which takes into account such parameters as: the volume of the room, its geometric shape, the outline of surfaces, obstacles that prevent the formation of an echo and other points.

With proper design, ideal distribution of reflected sound can be achieved and sufficient diffuseness of the sound field can be obtained. A sound inspection of the assembly hall is not a recommendation or wish of the owners, it is a requirement approved by law. The thing is. that the degree of soundproofing and the quality of noise insulation can directly affect the operation of the facility in the future. The better the music sounds in the assembly hall or the voices of performers performing are heard, the more efficiently the room will be used.

The main tasks in sound design of an assembly hall?

Since an assembly hall is always a closed room, after the source of noise or sound stops functioning, those in the hall pick up musical or conversational elements after some time. This phenomenon is explained by the fact that the ultrasonic sound generated at the calculated point is projected as direct sound energy and the energy of sound waves reflected from the surfaces. Accordingly, reverberation appears - the effect of reducing sound energy. The acoustic design of the assembly hall faces a number of tasks:

• reduction of reverberation time;

• transmission of pure sound without sound amplification to the rear platforms of the assembly hall;

• determination of noise level with identification of its sources, classification and main characteristics;

• a search is being carried out for optimal instruments that would transmit sound through the air field without the effect of echo and sound vibrations;

• a selection of practical elements affecting the level of hum and their application in accordance with established technical standards.

Most of the stages of acoustic design of an assembly hall are carried out using digital technologies, but the final result and effectiveness of all activities depend on the initial stage (collection and analysis of initial data).

What stages should it be divided into?

The initial stage of acoustic design of an assembly hall, like any other structure, involves working with the architectural design, actual areas, geometric shape, capacity of the hall and its cascading. If all the information on architectural and technical aspects has been processed, then the acoustic design of the assembly hall proceeds to a specific stage:

• the use of geometric or ray sound reflectors and the construction of their projections;

• determination of the minimum, recommended and maximum reverberation time;

• carrying out a direct calculation of reverberation time based on its area and the number of visitors;

• analysis and analysis of design, materials and structures (furniture or equipment) for their sound absorption;

• testing speech intelligibility in the hall using exclusively natural acoustics.

 Acoustic design of assembly halls is a multi-level system that can outperform even construction design and architectural solutions. Improper acoustic design will lead to the fact that the sound will be dissipated as much as possible in the first rows, echoes will reach the middle of the assembly hall, and even background noise with interference and hum will reach the last rows.      

Acoustic characteristics of assembly halls

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