Professional audio equipment for stage performances is collectively referred to as stage sound, stage sound is an important branch of performance equipment
Stage sound main function
Live performance
2. Conference loudspeakers, recordings
3. Music playback and compatible karaoke singing
4. Play background music
Stage audio equipment including: monitor mixer; power mixer; portable mixer; power amplifier; dynamic microphone; condenser microphone; wireless microphone; speaker; monitor speakers; amplifier speakers; ultra-low speakers; equalizer; ; Effects; delay; compressor; limiter; crossover; noise door; CD player; recording deck; DVD player; projector; adapter; VOD; headphones and many other equipment

Sound technology
Theater stage and other indoor theatrical performances, the first request is the sound art, first of all to ensure that the sound quality, to be pleasant, beautiful sound, outdoor open-air theatrical performances, the first request is the audio technology, first of all to ensure that theatrical performances The accident, the successful completion of theatrical performances, as the outdoor performing arts relative to the indoor performance is relatively difficult, so there are many specific technical requirements:

First, the sound system to have a strong power reserve: outdoor sound field, you need to have a strong power, because the outdoor sound field to improve the sound pressure level 3db, power need to increase 10 times, according to the formula 10logp2 / p1 = xdb, Calculate the specific ＆#118alue of the sound field.

Second, to lift the speaker: outdoor theatrical performance speaker placement position can not be too low, low sound speaker is easy to be the audience sound absorption, resulting in grazing sound absorption phenomenon, especially in the high frequency loss greatly, so to use the lifting speaker installation, Midrange or treble horns and outdoor special speakers (speaker with high power treble horn), so that the sound of the speaker in the air radiation distance is far, so that the audience can get enough loudness.
Third, select the high sensitivity mic, this can increase the mic gain of the microphone, so that the audience can get enough loudness. Outdoor performances are often MIC and the distance between the mixer are far, so you can choose the appropriate wireless MIC for better pickup.

Fourth, the protection of power lines: sound system energy is from the power grid circuit, if the power circuit failure sound system will be a problem. So the power circuit should be the local professional electrician to carry out technical support work. The entire line mixer to the indoor gates or temporary trams should be protected by specialized security personnel.

Fifth, to protect the speaker line: outdoor performance power amplifier and speaker distance, are generally far, in order to prevent the speaker line and short circuit caused by failure and damage to the amplifier, so there must be someone to protect the speaker line, power amplifier output impedance is very small, Only a few ohms, but the sound power is very large, so the current is relatively large, this line is not easy to long distance, and cut off the area should not be too small, so as to avoid unnecessary sound power loss, if conditions, you can power amplifier Placed in the speaker near the location to reduce the unnecessary loss.

Sixth, the sound division and the audience of the assistant through the walkie-talkie to keep in touch, so that the sound division can be more accurate and more timely grasp the auditorium sound effects in order to adjust in a timely manner.

evaluation standard
There are two kinds of evaluation standards for audio quality for stage performance. The first is objective standard, that is, instrument testing standard; the second is subjective evaluation standard. Which is the instrument testing standards (that is, objective criteria) is clear, subjective standards vary from person to person, so the first objective to detect good performance, is a good speaker and the foundation, of course, subjective evaluation should be "good resolution ( High degree of music ")," strong sense of lively (music performance lively) "," good knot (voice cohesion, positioning good) "," a sense of air (good elasticity) "," high transparency Good force) ".

Stage professional audio debugging precautions
The debugging of sound engineering needs to be treated with a serious and responsible attitude. Only by ensuring that the design, construction, system construction and equipment performance are fully understood before we can get a better debugging results, for the general debugging work often problems , Where we introduce to you a few debugging should pay attention to the technical aspects, for your reference.

① before the commission must be a good understanding of the system structure and equipment performance, because only a comprehensive grasp of the system and equipment, we only according to the actual situation to develop a feasible debugging program in order to debug the situation may be estimated, otherwise , The system, equipment, do not understand the situation is not familiar with blind debugging, the results will certainly not ideal. Especially for us in the general project rarely used in some new, special equipment, installation and commissioning must carefully study its principles, performance and operating methods. ② Before the commissioning of the system, equipment, the situation must be a comprehensive check. Because the installation and stand-alone inspection process and the focus of the system debugging, after all, the setting of the equipment is often arbitrary, before the debugging may be some important set button and the actual requirements have been completely different, so a comprehensive inspection is If necessary, it is best to record the setting of each equipment.
③ debugging should be based on the characteristics of the system using the appropriate debugging method. Because the system requirements of audio and light engineering may be different, the equipment involved is not the same, if blindly in accordance with the general engineering debugging methods for debugging, the results will not be ideal. For example: a no feedback suppressor sound system, debugging, if not refer to the design results, only long time high gain sound reinforcement approach to find the feedback point, it may lead to damage to the speaker.