Sound reinforcement project for the Great Hall Auditorium

I. Overview:

The auditorium has a volume of 93,000 cubic meters, making it the largest indoor auditorium in the world. In 1980-1990, the sound reinforcement system was rebuilt, especially after 1990, the problem of language articulation was better solved. After entering the 1990s, the auditorium has been used more widely and has higher requirements. With the continuous development and progress of electro-acoustic technology, the problems that have existed for 40 years after the auditorium was built, such as the impact of architectural acoustic characteristics on sound quality and clarity, have been solved in the sound system transformation undertaken by Beijing Zhongda Huatang Electronic Technology Co., LTD. In recent years, major political conferences and performances have proved good acoustics.

Meeting in progress

Two, several main guiding ideas for the transformation of the sound reinforcement system of the auditorium:

1. Making sure your language is clear is the most important thing. The acoustic design of the auditorium should ensure that the language is clear as a primary task, and in this context, consider other sound quality parameters.

2. The sound quality in the auditorium, including speech clarity, is the combined effect of the interior acoustic decoration and sound reinforcement system. The two must be closely combined to ensure that good sound quality is achieved in the hall.

3. To ensure the stability and reliability of the system quality as the premise, consider the selection of system equipment. For the new technical equipment developed in recent years, good quality can be given priority in practice.

4. In view of the large volume, area and seating capacity of the auditorium, it is unconventional, so some equipment needs to be processed and customized according to the needs of the project, and is not limited to the selection of existing stereotyped equipment.

Third, sound reinforcement scheme:

3.1 Cover the main loudspeaker system in the hall

3.1.1 Installing the conference loudspeaker System

The hidden loudspeaker system near the platform is used for the language amplification of large conferences. Its characteristics are mainly to meet the clear language, and the loudspeaker system is mono three-frequency division. The tweeter uses 8 long-distance pitchers to cover the second and third floors, and 7 pitchers to cover the first floor; The middle tone uses a horn load box loudspeaker 11 cover one, two and three layers, respectively, and the bass uses a customized high-power loudspeaker box 3, which properly controls its directivity to cover the whole audience. In order to avoid the grid blocking the sound radiation serving the third floor loudspeaker, the medium and high frequency loudspeaker covering the third floor is secretly installed at an elevation of about 29 meters above the platform mouth. In addition, 51 full-frequency coaxial loudspeakers are distributed in the first and second floors to supplement the lack of direct sound energy under the floor. Seven small scale full-frequency speakers are installed on the lip to improve front row hearing.

3.1.2 Loudspeaker system for open hanging music

This loudspeaker system is three-frequency plus subbass, which is used for large and medium-sized theatrical performances. 37 full-frequency speakers are divided into three groups of hanging loudspeakers in front of the stage. The lower part of the loudspeaker group is about 12 meters away from the ground. The three groups basically cover the whole field and can be lifted and lowered. Six sub-low frequency speakers are placed in the right lattice of the platform port. It is equipped with a coaxial loudspeaker to make up for the lack of coverage of the music amplification loudspeaker system.