[Audio Network Information] The audio system should be operated at the rated level. For this purpose, the peak (PEAK) indication or overload indication is set in the input circuit of various professional audio equipment. When using the Gain button on the mixer, it is best to control the input level to the position where the indicator light is just lit. Some people think that as long as the peak (PEAK) lamp is adjusted to keep flashing, actually The flashing of the peak indicator light means overload distortion. The correct adjustment method is to open the gain button until the peak indicator lights up and then slowly return to the position where the peak indicator light is not bright. Secondly, the resonance frequency of the sound reinforcement is equalized. The method is to first adjust all the tone control buttons and the graphic equalization control button on the device to 0 dB position, then connect the high-quality, wide-band microphone, and put it into the middle of the dance floor, open the system, and add the reverb effect. Turn the volume up to just a slight howling, then return 3dB, so that the basic technical requirements can be met.
1. Analyze the sound source and treat it differently <br> The sound reproduction time of the dance hall audio system is relatively long, and the playback loudness is large, sometimes up to 120dB. Therefore, the sound field effect processing required for tuning is very careful. The more frequency segments of the compensation circuit, the more it is possible to create a specific sound field stimulation effect, and the reasonable frequency compensation processing can also produce a good sound field effect. This kind of processing does not have a fixed pattern and needs to be treated differently by analyzing the sound source. For example, for Disco music programs, frequency compensation processing is not required, and even if the loudness is large, it is not easy to produce an uncomfortable feeling; for the frequency compensation of the instrument sound source, attention should be paid to the effect of the melody performance, usually, when the wide-range musical instrument When the frequency compensation characteristic of the sound source is not straight, the loudness of each scale will be inconsistent, so the frequency compensation for wide-range instruments should generally not exceed ±6dB, and the compensation curve should be as straight as possible, and for example, the low-frequency attenuation is 6dB, and the high-frequency boost is At 2dB, the intermediate frequency should be placed at -4dB to flatten the frequency response curve of the entire frequency band. The high frequency components of LD and CD sources are heavier. It should be noted that the frequency band above 7.5 kHz cannot be excessively increased to avoid distortion of high frequency components. The high frequency sensitivity of moving coil microphones is low, and the 7.5 kHz band should have sufficient Increase the amount so that the clarity of the sound is improved. Some modern music works tend to give a certain boost to the 7.5 kHz frequency band, because the frequency band above 7.5 kHz can provide a layer of clarity for the souvenir, but the frequency band above 7.5 kHz will produce a "squeaky" sound. If the promotion is excessive, it often produces a feeling of hairiness.
2, grasp the characteristic frequency band, adapt to local conditions <br> In listening, there are three aspects that easily cause fatigue:
First, the sensory fatigue caused by the 80~150Hz frequency band. When the excessive low-frequency sound wavelength time acts on the human body, it will gradually feel the discomfort of the head weight, chest tightness, etc., which is prone to irritability;
The second is the auditory fatigue caused by the 3~4kHz frequency band. If the sound loudness of this frequency band is large, there will be a feeling of “fried earâ€, which will cause people to feel pain;
The third is a screaming sound produced by the 6.8 kHz band. Therefore, in the loudness playback, attention should be paid to the following aspects in terms of frequency response characteristics:
1) The bass part with the frequency in the range of 80~50Hz cannot be a continuous sound type. It can only be a short hit type; otherwise, there will be a long time noise, which is not suitable for loud loudness playback.
2) The high-pitched voice cannot be screamed. The crisp and pleasing sound is good, but if it sounds 120dB, it is unbearable. The source of the whistling sound is usually concentrated at 6.8 kHz, so the attenuation of this band can reduce the screaming of the source. In some Disco ballrooms, in order to produce the "bombing" hard effect, the 3.4 kHz band is often upgraded, so that the hearing is more fatigue-prone, and this effect should not be played for a long time.
3) The frequency band around 800Hz often gives people a feeling of noisy and narrow, and attenuating this frequency band can effectively improve the music playing effect.
The sound at the 80Hz frequency band gives a powerful and powerful stimulating effect. The rhythm sound of Disco music often produces a strong dynamic effect in this frequency band, but it is easy to form a turbid sound when you pay little attention or a little excess, especially when Intermodulation distortion is caused when the woofer is over-frequency too much. The method to avoid is to take a narrow enough segment for the lower frequency and use a single power amplifier system for playback. The playback power is generally only 25~125Hz.
1. Analyze the sound source and treat it differently <br> The sound reproduction time of the dance hall audio system is relatively long, and the playback loudness is large, sometimes up to 120dB. Therefore, the sound field effect processing required for tuning is very careful. The more frequency segments of the compensation circuit, the more it is possible to create a specific sound field stimulation effect, and the reasonable frequency compensation processing can also produce a good sound field effect. This kind of processing does not have a fixed pattern and needs to be treated differently by analyzing the sound source. For example, for Disco music programs, frequency compensation processing is not required, and even if the loudness is large, it is not easy to produce an uncomfortable feeling; for the frequency compensation of the instrument sound source, attention should be paid to the effect of the melody performance, usually, when the wide-range musical instrument When the frequency compensation characteristic of the sound source is not straight, the loudness of each scale will be inconsistent, so the frequency compensation for wide-range instruments should generally not exceed ±6dB, and the compensation curve should be as straight as possible, and for example, the low-frequency attenuation is 6dB, and the high-frequency boost is At 2dB, the intermediate frequency should be placed at -4dB to flatten the frequency response curve of the entire frequency band. The high frequency components of LD and CD sources are heavier. It should be noted that the frequency band above 7.5 kHz cannot be excessively increased to avoid distortion of high frequency components. The high frequency sensitivity of moving coil microphones is low, and the 7.5 kHz band should have sufficient Increase the amount so that the clarity of the sound is improved. Some modern music works tend to give a certain boost to the 7.5 kHz frequency band, because the frequency band above 7.5 kHz can provide a layer of clarity for the souvenir, but the frequency band above 7.5 kHz will produce a "squeaky" sound. If the promotion is excessive, it often produces a feeling of hairiness.
2, grasp the characteristic frequency band, adapt to local conditions <br> In listening, there are three aspects that easily cause fatigue:
First, the sensory fatigue caused by the 80~150Hz frequency band. When the excessive low-frequency sound wavelength time acts on the human body, it will gradually feel the discomfort of the head weight, chest tightness, etc., which is prone to irritability;
The second is the auditory fatigue caused by the 3~4kHz frequency band. If the sound loudness of this frequency band is large, there will be a feeling of “fried earâ€, which will cause people to feel pain;
The third is a screaming sound produced by the 6.8 kHz band. Therefore, in the loudness playback, attention should be paid to the following aspects in terms of frequency response characteristics:
1) The bass part with the frequency in the range of 80~50Hz cannot be a continuous sound type. It can only be a short hit type; otherwise, there will be a long time noise, which is not suitable for loud loudness playback.
2) The high-pitched voice cannot be screamed. The crisp and pleasing sound is good, but if it sounds 120dB, it is unbearable. The source of the whistling sound is usually concentrated at 6.8 kHz, so the attenuation of this band can reduce the screaming of the source. In some Disco ballrooms, in order to produce the "bombing" hard effect, the 3.4 kHz band is often upgraded, so that the hearing is more fatigue-prone, and this effect should not be played for a long time.
3) The frequency band around 800Hz often gives people a feeling of noisy and narrow, and attenuating this frequency band can effectively improve the music playing effect.
The sound at the 80Hz frequency band gives a powerful and powerful stimulating effect. The rhythm sound of Disco music often produces a strong dynamic effect in this frequency band, but it is easy to form a turbid sound when you pay little attention or a little excess, especially when Intermodulation distortion is caused when the woofer is over-frequency too much. The method to avoid is to take a narrow enough segment for the lower frequency and use a single power amplifier system for playback. The playback power is generally only 25~125Hz.
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