"""Briefly describe the six steps of sound system debugging: the steps of sound system debugging are as follows:
First, connect the amplifier and speakers to the system, turn on the power of the equipment one by one, and then connect them to the phase meter after they work steadily. Check whether the phase of all speakers is correct one by one at a small volume.
Second, connect the noise generator and equalizer into the system, prepare the spectrum analyzer, and set the spectrum analyzer in the corresponding place according to the national requirements for testing the sound amplification quality of relevant halls. Then the pink noise signal is amplified at a moderate volume, and each frequency point of the equalizer is carefully and slightly adjusted within the audio range of 20-20 KHZ. On the premise of keeping the same volume, the room frequency response curve displayed by the spectrometer is basically flat at each test point, and the position of each frequency point of the equalizer is recorded. At the same low volume and rated volume, the equalizer was debugged and recorded. Finally, the recorded equalizer frequency points were compromised, and the higher gear of the spectrometer was used for testing. After proper correction, the equalizer frequency point position could be determined. Note that when debugging the equalizer, the frequency equalization point of the mixer must be at 0, and other peripheral processing equipment must be in the bypass state. In addition, considering the listening habits of ordinary people, the signal above 10k of the equalizer can be appropriately attenuated.
Third, the electronic frequency divider into the system, frequency divider debugging. For the frequency divider, which is only used as the subwoofer frequency divider, the subwoofer system can be allowed to work independently after the equalizer debugging. The subdivider's frequency divider can be set at 150-300hz, and the gain of the bass signal can be appropriately adjusted to feel that the volume is suitable. For the frequency divider as a full frequency system, it must be as far as possible to refer to the speaker manufacturers recommended to set the frequency divider, and then repeatedly adjust the signal gain of each frequency band, until the hearing sense is more balanced, and then refer to the sound pressure level test behind the gain can be further fine-tuning.
Fourth, the determination of sound pressure level. Same pink noise meter access amplification system, as well as debugging equalizer to select a few place sound pressure meter test points, adjust the sound system of all the Settings are finished, the open system equipment, gradually improve noise signal volume, in guarantee under the premise of the best dynamic signal, adjust the gain of each equipment, expand the sound pressure of the system to meet the design requirements in all test points, at the same time need to refer to the sound pressure level in the case of high, medium and low frequency band, again to equalizer and frequency divider do some adjust slightly, of course the high, medium and low frequency sound pressure level can't be exactly the same, Generally, in order to consider the characteristics of the sound sense, it is necessary to make some reduction in the high frequency sound pressure level, while the bass system of DISCO system needs a higher low frequency sound pressure level after it is turned on. In the test of sound pressure level, it is necessary to compare the sound pressure level of each test point. If the result deviation of each point is large, that means the uniformity of the sound field is not good, it should be analyzed and improved seriously. This problem will be discussed later.
Fifth, the debugging of microphone and effector. Generally, the debugging of microphones should be classified. Wired microphones for human voice and Musical Instruments usually need daily users to cooperate with each other. When debugging, it is necessary to understand the most reasonable model and distance of microphones for each and every musical instrument. The wireless microphone needs to pay attention to: the position of the antenna to be reasonable, the use of the microphone dead point and feedback point should be enough, and make a detailed record of the position, the receiver's signal gain to be appropriate, noise suppression fine-tuning knob to be repeatedly adjusted; For the effect of debugging project requirements are not strict, as long as the signal input and output gain reasonable debugging, ensure that there is a certain margin, and the reverberation time and delay limit in a certain range, so as not to affect the continuity of definition of the language and the signal can be, the use of other specific adjustment allows the operator to make their own.
Sixth, for the pressure limit device debugging, generally in other equipment after the basic completion of debugging. In most projects, the function of voltage limiter is to protect power amplifier and speaker, and to keep the sound stable. Therefore, the starting level of compression should be set according to the signal strength. Generally, the starting level should not be set too low, otherwise the sound quality of the system will be affected, but setting too high will also lose its protection. The compression start time setting should not be too long, so as not to make the protection action is not timely, but too short will destroy the sound quality, produce strange sound, compression recovery time should not be too short, otherwise will produce strange sound; The compression ratio is set at about 4:1 in general engineering.
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