The principles that sound reinforcement systems should follow during construction

Any system, whether it is design, installation or commissioning, must be carried out in accordance with the relevant standards and regulations, in order to ensure the quality of the system. The following are some of the national standards and related industry standards that are very important in the design and construction of sound reinforcement systems. They should be used as the basis for engineering technology and the basis for design, construction and acceptance.

GB---4959 Hall measuring method for sound reinforcement characteristics

GYJ25---86 indication of the acoustic characteristics of the hall sound reinforcement system

SJ2112—82 The preferred electrical matching value of the interconnection of the hall sound reinforcement system equipment

GB9003-88 Mixer basic characteristics measurement method

JGJ/T16-92 Civil Building Electrical Design Code

GAB500-95 Low Voltage Power Distribution Design Specification

WHO301—93 Acoustic characteristics and measurement methods of the sound reinforcement system of the dance hall

GB 3785 sound level meter, sound performance and measurement method

GB 9001 audio amplifier measurement method

The installation of the sound reinforcement system is a very comprehensive technology, and it is also a relatively complicated system engineering, involving indoor building structure, decoration scheme, power supply, etc., and needs a comprehensive overall consideration. According to the specific situation and requirements of the block diagram of the sound reinforcement system, according to the geometric size and shape of the hall and the control room, in accordance with the principle of safe, reliable and easy to use, the layout of the system equipment includes equipment lifting, signal transmission lines and power supply lines. Process requirements are designed. In the design, relevant data should be collected according to the relevant national standards and relevant industry standards. The power consumption of the system, the performance, specifications, weight, size, etc. of the equipment should be clear, in order to combine the specific conditions of the system. A viable overall plan.

System layout

The system layout is to determine the location of all devices in the system. For example: the position and height of the speaker, how to arrange the location of all the equipment in the control room is more reasonable; when there is a video system, whether the projection and the screen, the position and height of the monitor suspension affect the viewing angle: when there is a lighting system, different How to shape the type of luminaire and how to hang it to better highlight the characteristics of different types of lighting. In the overall design, we must first have a clear positioning, each system is moving closer to a certain style, to avoid the overall effect is non-negligible. The overall design is the embodiment of experience and thinking ability, rather than on paper. In the actual construction process, some contradictions may occur. This is normal and can be modified slightly.

Control room and equipment room

Under normal circumstances, the control room and the equipment room are combined into one, but because of the location and space reasons, it is not separated, and should be considered according to the specific conditions and conditions. First of all, the control room should be designed in the position of observation and performance and performance, so that the operator can master the sound and lighting of the scene well, so as to facilitate communication with relevant personnel. The control room is located on the same side of the stage performance or at the other end of the stage. It is necessary to look at the actual situation and cannot be generalized. The general theater is a place where the stage performance is the main stage. The control room can be placed on the same side of the stage to keep in touch with each other, which is conducive to improving the quality of sound and performance: when the performance field has more effect light, it is better to control the room. It is located at the other end of the stage to better observe the current lighting effects, in order to better control the atmosphere inside the venue.

The location of the control room and the equipment room and the size of the equipment room are often overlooked by the operators. In order to increase the business area, you can find a place to do the machine room. Some of the computer rooms are small enough to be installed on the wall, leaving only the staff. Based on the ground, the heat dissipation and maintenance of the equipment are problems, not to mention the working environment and conditions. In fact, the equipment room is very important, there are many valuable equipment in the equipment room, they must be considered in accordance with the requirements of the specification. Anyone in the equipment that can be assembled on a 19-inch standard rack must be installed on a 19-inch standard rack. The back of the rack should not be against the wall. There should be a certain space to make the equipment easy to dissipate heat and easy to overhaul. The size of the equipment room should be separated from the space occupied by the equipment and the working surface of the staff. It should also be considered to leave a certain margin, generally not less than 10m2.

(3) Signal transmission route

After the location of the system equipment is determined, the signal transmission line, control line, etc. should be based on the principle that the line is shorter and better, to determine the specific direction of the line pipeline, and the specific location of the line, the line pipeline needs to be embedded. All signal lines, speaker cables, control lines, etc., which do not need to be reconfigured after installation and commissioning, must be directly connected to the equipment in the control room and directly connected to the equipment. There must be no joints in the middle. Transmission lines such as various types of electronic musical instruments and various types of microphone signals are connected directly, and it is preferable to add a wall junction box for ease of use. Signal transmission cable must use double core.