Troubleshooting and resolution process of audio system problems in multi-function hall of high-end hotel
Phenomenon and system
1. Due to external interference, the sound amplification system can hear the broadcast sound.
2. The system's subwoofer is silent.
3. The functions of monitoring various signals in front of the mixer driver cannot be realized.
4. Effector cannot add effect.
5. The background noise of the system is large
Other problems in system configuration and installation are found after inspection:
1. The level of system equipment is unbalanced. For example, mixer, power amplifier, speaker, etc. are high-grade imported products, and equalizer, voltage limiter for domestic unknown brand (belong to a lower class).
2. Three equalizers. The main output equalization, the subwoofer output equalization, the auxiliary output equalization.
3. Power amplifier installation is not standard. Power amplifier as a result of heavier, because did not install on machine ark put aside to block, bring about the before face plate of power amplifier distortion is out of shape.
4. The placement of the speakers was not adjusted according to the location and usage, which led to the noise of microphone amplification.
Ii. Cause analysis
1. You can hear the radio.
The reason for this situation is that the signal line connected to the MIC input end of the mixer is not well shielded, which leads to the broadcasting signal being serialized into the sound amplification system. After detection, amplification and output, the broadcast sound is heard. Although the radio signal is very weak, and radio frequency modulation signal, usually it is impossible to hear the radio signal amplification system, but because of the mixer is the microphone input port, the input sensitivity is higher, such as the input signal shielding bad (shield off ground), and have the effect of the antenna, combined with a series circuit of system equipment, have the effect of the equivalent of detection, heard radio broadcast is not surprising.
2. No ultra-low sound output of the system.
From the point of view of the signal flow of the system, the general ultra-low sound signal is taken out from the main channel signal or marshallchannel signal by the electronic frequency divider, then amplified by the corresponding power amplifier and sent to the ultra-low sound box. From the point of view of these links, the key is to check whether each connection cable, connector, related equipment is normal.
The above phenomenon is mainly caused by the unfamiliarity with the signal process of the mixer, and the failure to place the corresponding buttons or the buttons and output knobs of the monitoring output part in the correct position.