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Selection of sound reinforcement equipment in Gymnasium

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1. Speaker system

The speaker is the mouthpiece of the whole audio-visual system, so it should be considered as the primary factor. The selection of sound box should start from the sensitivity and rated power of sound box, and determine the power of each sound source. According to the directivity of the speaker to analyze and control the sound field of the hall, determine the position of each speaker, input impedance and input power, and calculate the matching power between the speaker and the power amplifier. The front area uses soundtop L-8 medium and high frequency linear array speakers of the famous American brand, plus two ultra-low speakers of the same brand series to meet the needs of sound reinforcement, Six rabbits were used in the rear area two In order to make up for the problem of insufficient sound reinforcement in the rear area.

2、? power amplifier

In order to ensure the sound quality of sound reinforcement system, the power amplifier should have enough power margin and can work stably for a long time. At the same time, the selected amplifier should have perfect technical measures in improving efficiency, reducing distortion, short-circuit and no-load protection and reducing temperature rise. In order to ensure the consistency of sound reinforcement, the same brand of soundtop Ma and M series power amplifiers matching the speaker power are selected.

3、? Mixer and other equipment

The mixer is the heart of the whole audio-visual system. It should have good electrical performance, stable working state, flat frequency response and minimal harmonic distortion. The function of the mixer is very different. Therefore, it is necessary to select different number of input channels and output groups according to the functional requirements of the whole system. We choose Yamaha, a famous Japanese brand ? MG24/14FX Device, it's going to According to the requirements of various acoustic signals, the output signals are divided into several groups to compensate. The technical index and debugging of the mixer are directly related to the sound quality and system noise. In addition, according to the acoustic requirements of different halls, the appropriate equalizer, delay device, reverberator, voltage limiter, frequency divider and other equipment can be selected to form a normal, stable and reliable sound reinforcement audio-visual system. Therefore, the processor is dbx260, the divider is DBX 231, and the voltage limiter is DBX 266xl.

In order to facilitate the work and reduce the damage to the equipment, two intelligent sequential power managers are configured to make the whole system equipment run more stable.

4、? Program signal source equipment

The program signal source includes FM, AM broadcast reception and retransmission, record (including CD) and tape playback equipment and equipment. Due to the low input level of program signal source, all devices and equipment must ensure high sensitivity, high signal-to-noise ratio, small distortion and good reliability. The DVD player adopts Japanese brand pianeer dv2100, which can play various formats of discs.

5、? Selection of microphone

Microphone is the first stage "entrance" of sound reinforcement system. The output voltage of natural sound source signal after acousto electric conversion of microphone is processed and amplified by mixer and power amplifier, and then fed back to speaker system, and the amplification times can reach tens of thousands. The performance of the microphone directly affects the quality of the system; the characteristics of the microphone directly affect the pickup and playback effect of the system; whether the microphone is placed correctly or not directly affects the transmission gain of the system; the signal connection of the microphone directly affects the signal-to-noise ratio of the system. The correct use of microphone is one of the keys to keep the whole audio system in good working condition.

The selection of microphone must be adapted to the acoustic environment and the object of the microphone. The selection should be made according to the general requirements of the sound reinforcement system, the application situation, the sound pickup source, the technical characteristics of the microphone itself and the characteristics of the hall. The whole system is equipped with four iron triangle 49q to meet the needs of ordinary meetings, two sets of mipro act52 / 5hd * 2 are used for performance or speech, and a set of mipro act52 / 5t / mu55hn * 2 head mounted microphone is equipped for use when it is not convenient to hold the microphone.

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Company main: conference room sound system engineering, stage lighting sound engineering, karaoke sound

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