The “Two-Seven-Four Principles” of Gymnasium Sound System Design

At present, most small and medium-sized gymnasiums are considered for multi-functional use. In addition to meeting the functional requirements of various future sports competitions and trainings, all kinds of theatrical performances must also be taken into account. Therefore, the design of the sound system must be comprehensively considered to meet the sound reinforcement needs in various situations as much as possible.


The design of the stadium sound system includes two aspects:

The first is architectural acoustic design, which mainly considers the gymnasium’s body shape, building structure, and selection and layout of sound-absorbing materials. It mainly solves: the reverberation time of the entire hall, the uniformity of the sound field distribution, and avoid various acoustic defects, so as to construct a sound field with sufficient loudness, clarity and uniformity to meet various functions.

The second is electro-acoustic design. It must be based on sound building design. Through the selection and layout of various speakers, the selection of audio equipment, and the composition of the system, the final acoustic effect in the hall can be achieved: suitable loudness, clear language, and sound quality beautiful. Therefore, the two must work closely together and coordinate the design.

The electroacoustic design consists of 3 parts:12-28-2016-rams-stadium-seating-1

General requirements for system design;

System equipment selection and configuration (including sub-systems: voice reinforcement, performance reinforcement, broadcast sound reinforcement, etc.);

Acoustic design of the control room. The second item above is the key point.

According to the Ministry-promulgated standard “Measurement Regulations for Stadium Acoustic Design Section”, the sound reinforcement system should include the following 7 systems:

(1) Sound reinforcement system for the auditorium;

(2) Sound reinforcement system for the competition venue;

(3) Inspection call system for the restrooms, practice areas and workplaces of athletes, coaches, referees, medical staff, etc.;gillette-stadium-1

(4) Background music and broadcasting system for audience rest and other rooms;

(5) To the broadcasting system near the entrance of the museum;

(6) High-quality mobile sound reinforcement system for theatrical performances;

(7) Other systems, such as mobile music playback systems for gymnastics competitions. They can be used online or independently.

According to the usage requirements of the gymnasium, the electroacoustic in the gymnasium should include the following four points:

(1) It must have a sound reinforcement system for independent control and switching of functional rooms in the competition arena, audience seats, and rest halls;

(2) Must have a mobile sound reinforcement system for the opening ceremony, closing ceremony and theatrical performance;

(3) It must have a time sequence broadcasting system for emergency disaster notification that can automatically switch over the authority of emergency broadcasting, automatically raise the broadcasting sound level, and evacuate according to the prescribed procedures and flow direction;

(4) It is recommended to set up audio relay interface terminals for radio and television stations.

For small and medium-sized gymnasiums, “Level 3″ is the preferred solution for sound system transformation?

In the “Measurement Regulations for the Acoustic Design Section of Gymnasiums” standard, the characteristic parameter index of the sound reinforcement system is required to be divided into 3 levels, and each level has 5 characteristics: maximum sound pressure level, transmission frequency characteristics, sound transmission gain, sound field unevenness, and system noise Parameters and requirements. For the characteristic parameter index requirements of small and medium-sized gymnasiums, considering the comprehensive consideration of economy, practicability, and nuisance to the people, “Level 3″ is generally recommended.


This is because, if the gymnasium is in a residential area, the maximum sound pressure level cannot be too high to avoid sound leakage and disturbing the people. The frequency transmission characteristics are narrower than the “first-class” low frequency band bandwidth. -10dB, in the frequency band where the energy of the speech spectrum is concentrated, high speech intelligibility can be ensured, and the sound transmission gain is only 2dB lower than the “first level”. The sound field unevenness is only 2dB lower than the “first level”, and the system noise is 3 The requirements of each level are the same, the maximum sound pressure level will not be too large, in addition to avoiding disturbance to the people, it also reduces the number of speaker systems and power amplifiers. Can save a lot of money. Transmission frequency characteristics, sound transmission gain, sound field unevenness, etc. are mainly problems in building sound equipment, which will not be greatly affected by the system and equipment. The circuit frequency response of the sound system is 20/80Hz, ~1.6KHZ/20KHZ, 3dB. Therefore, the third level is the preferred plan for the reconstruction of the sound system of the gymnasium.


The specific statement required is:

(1) There is enough loudness in the auditorium.

(2) The arrangement of the speakers should cover the entire auditorium and the playing field, try to make the sound field uniform, and there should be no dead zones.

(3) Have clear listening conditions, a good sense of direction and the fidelity of the program o

(4) The system should have sufficient stability and power margin.

In order to meet the above requirements, referring to the “Level 1 Index of Sound Reinforcement System for both Language and Music” stipulated in the original Ministry of Radio, Film and Television Standard “Level 1 Index of Hall Sound Reinforcement System”, the sound reinforcement system of the competition hall of the hall is as follows Technical index design:

(1) The maximum sound pressure level (the steady-state quasi-peak sound pressure level of the empty field) 125Hz-4KHz average sound pressure level greater than or equal to 102dB.

(2) The average sound pressure level of the transmission frequency characteristic at 100Hz-16KHz is 0dB, and it is allowed to be greater than or equal to +/-3dB in this frequency band.

(3) The average value of sound transmission gain of 125Hz-4KHz is greater than or equal to -10dB.

(4) The unevenness of the sound field is 1KHz, and it is less than or equal to 6dB at 4KHz.

Post time: Jan-11-2021
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