In the indoor stage performances such as the theater stage, the first requirement is sound art. First of all, to ensure the quality of the sound, to be pleasant, beautiful, outdoor performances, the first requirement is sound technology, first of all to ensure that the performance is not In the event of an accident, the task of performing a cultural performance was successfully completed. Because outdoor art performances are relatively difficult to perform indoors, there are also many specific technical requirements:
First, the sound system must have a strong power reserve: outdoor open sound field, need to have strong power, because the outdoor sound field should increase the sound pressure level of 3db, the power needs to increase by 10 times, according to the formula 10logp2 /p1 = xdb, can Calculate the specific value of the sound field.
Second, the speaker should be hoisted: the position of the outdoor literary performance speaker can not be too low, the sound of the low-level speaker is easily absorbed by the audience, resulting in grazing and sound absorption, especially for the high-end audio loss, so it should be installed by lifting the speaker. The midrange or treble horn and the outdoor dedicated speaker (the speaker has a high-powered treble horn), so that the sound waves of the speaker radiate far away in the air, so that the auditorium can get enough loudness.
Third, choose high sensitivity mic, which can enhance the mic's sound gain, so that the audience can get enough loudness. Outdoor performances often have a long distance between the MIC and the mixer, so it is better to use a wireless MIC for sound pickup.
Fourth, protect the power line: the energy of the speaker system is from the grid circuit, if the power circuit fails, the sound system will have problems. Therefore, the power circuit should be supported by a local professional electrician. The entire line mixer to indoor or temporary power generation vehicles should be protected by special security personnel.
5. Protecting the speaker cable: The distance between the outdoor performance power amplifier and the speaker is generally far. In order to prevent the fault and damage of the amplifier caused by the disconnection and short circuit of the speaker cable, there must be a special person to protect the speaker circuit, and the output impedance of the power amplifier is small. Only a few ohms, but the sound power is very large, so the current is also relatively large, the line distance is not too long, and the cut-off area should not be too small, so as to avoid unnecessary sound power loss, if possible, the power amplifier Place the speaker closer to reduce unnecessary wear and tear.
6. The sound engineer should keep in touch with the assistant of the auditorium through the walkie-talkie, so that the sound engineer can grasp the sound effect of the auditorium more accurately and in time, so as to make timely adjustments.
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