For indoor theatrical performances such as theater stages, the first requirement is sound art. First of all, the sound quality must be guaranteed. It must be pleasing to the ear and beautiful tones. Outdoor open-air theatrical performances. The first requirement is sound technology. In the event of an accident, the task of theatrical performance is successfully completed. Because outdoor theatrical performances are more difficult than indoor performances, there are also many specific technical requirements:

1. The stage sound system must have a strong power reserve: the outdoor open-air sound field needs strong power, because the outdoor sound field needs to increase the sound pressure level of 3db, the power needs to be increased by 2 times, according to the formula 10logp2 /p1 = xdb, The specific value of the sound field can be calculated.

2. Speakers should be hoisted: The speakers for outdoor theatrical performances should not be placed too low. The sound waves of low-level speakers are easily absorbed by the audience, causing glancing sound absorption, especially the high-frequency loss. Therefore, the high-frequency speakers should be installed by hoisting the speakers. Horn and outdoor dedicated speakers (high-power tweeter horns are installed in the speakers), so that the sound waves of the speakers radiate a long distance in the air, so that the auditorium can get enough loudness.

3. Choose high-sensitivity mic for stage audio, which can enhance the sound transmission gain of mic, so that the auditorium can get enough loudness. Outdoor performances often have a long distance between the MIC and the mixer, so it is better to choose a wireless MIC for sound pickup.

Fourth, protect the power line: the energy of the speaker system comes from the power grid circuit, if the power circuit fails, the sound system will have a problem. Therefore, the power circuit should be technically guaranteed by a local professional electrician. The entire line from the mixer to the indoor switch or temporary generator car should be protected by special security personnel.

5. Stage audio protection speaker line: The distance between the outdoor performance power amplifier and the speaker is generally relatively long. In order to prevent the speaker line from being broken and short-circuited and causing malfunction and damage to the power amplifier, it is necessary to have someone to protect the speaker line. The output impedance of the power amplifier is very high. Small, only a few ohms, but the sound power is very large, so the current is relatively large, the distance between this line is not easy to be too long, and the cut-off area should not be too small, so as not to cause unnecessary sound power loss, if possible, you can change The power amplifier is placed closer to the speaker to reduce unnecessary loss.

6. The sound engineer should keep in touch with the assistant in the auditorium through the walkie-talkie, so that the sound engineer can grasp the sound effect of the auditorium more accurately and timely, so as to make timely adjustments.