(1): There is no sound from the sound reinforcement system

The power plug of one or more of the audio equipment connected in series is not plugged in properly.

Solution: Check the power wiring board to make sure the socket has good contact.

(2): The sound reinforcement system occasionally makes a clicking sound, especially during music playback. This phenomenon constantly occurs, and the connecting wires between the various devices in the sound reinforcement system have virtual soldering. When there is a music signal, the virtual solder joint makes the sound signal intermittent.

Solution:

1. The wiring of each channel equipment must be thoroughly checked, and it is best to re-solder each connection point;

2. If each connection welding is thoroughly checked If the click phenomenon still occurs, the connecting wire may be broken. Use a multimeter to check each wire and replace the cable with broken wires inside.

(3): When the sound reinforcement system is muted, the humming sound is serious

1. The shielding wires connecting each channel equipment have poor contact or weak soldering.

Solution: Carefully check the shielded wires between each device and use welding as much as possible.

2. The device with a three-pin power plug is connected to the second-line input socket, and the live wire and neutral wire of the second-level are reversely connected.

Solution: The two-wire input socket, neutral wire and live wire must be reversed. Generally, the left leg of the socket is the live wire and the right leg is the neutral wire. The power strip should be equipped with three pins, and the middle and upper pins should be connected to the earth wire to ensure the safety of electricity.

3. Some audio equipment uses two-pin plugs, but some equipment must use three-pin plugs, otherwise AC induction may occur during the connection, causing hum.

Solution: Turn the power plug of the audio equipment with a two-pin plug upside down.

(4): When the sound system and the lighting system are running at the same time, the communication noise of the sound system is very loud. However, after the lighting system is turned off, the communication sound of the sound system is inaudible. The sound system and lighting system*** Use the same single-phase electricity. The thyristor in the lighting system has a large working current and is of AC pulse type. It is directly coupled to the input terminal of the expansion device through the power lead, thus producing a loud hum.

Solution:

1. Use one single-phase power supply for the sound system and another single-phase power supply for the lighting system;

2. Use isolation for the power supply of the sound system The power of the transformer and isolation transformer should be larger than the electrical power used by the sound system.

(5): During the sound amplification process, a group of speakers or two groups of speakers at the left and right channel ports suddenly become silent. Generally, it is due to overloading of the power amplifier or the sound power of the speakers is too high. burn.

Solution:

1. Replace the power amplifier or speaker;

2. Replace the high-power transistor with special-shaped pairing to repair the power amplifier. You must pay attention to this situation The occurrences are all caused by overload, and you should attach great importance to operational issues when tuning. To protect the amplifier or speakers, the sound reinforcement system may consider adding a limiter.

(6): In the karaoke hall, the singing voice of the singer and the playing music accompaniment are separated and not integrated

1. The left and right channels of the sound source enter the mixing console, and the corresponding The panning knobs on the channels are placed randomly, resulting in confusing panning.

Solution: Correct the adjustment of the panning knob of the corresponding channel so that the output signal of the mixer retains the panning of the original sound source.

2. The room equalizer only compensates for the sound of music, or the room equalization curve adjustment of the room equalizer is unreasonable.

Solution: Readjust the room balance compensation curve.

(7): The effect processing of the singing voice is not added

1. The singing voice does not enter the effects machine.

Solution: Turn on the corresponding auxiliary knob on the singing channel, turn on the auxiliary knob sent from the auxiliary bus, and observe the input signal indicator light of the effect machine to see if there is an input signal.

2. The effect sound sent out by the effect machine is not programmed into the left and right channel buses or grouping buses.

Solution: Press the button programmed into the corresponding bus.

3. The effect machine is damaged.

Solution: Replace the effect machine.

(8): The effect sound in the singing voice is small and not full enough

Maybe only the single-channel effect sound of the effect machine is used, or the two-in and two-out effects of the effect machine are not used. connect.

Solution: Generally, effect machines have left and right channel inputs and left and right channel outputs. Try to connect them in this way.

(9): The sound source plays sound, but the sound reinforcement system speaker is silent

1. The sound source does not output a sound signal, or there is a short circuit or open circuit in the output plug and socket of the sound source equipment.

Solution: Repair the sound source equipment or replace the sound source equipment. Carefully check the sound source wiring and plug sockets to rule out shorts or open circuits.

2. There is an open circuit or short circuit in the connecting lines between the devices.

Solution: Carefully check the wiring of each device and the connection status of plugs and sockets to eliminate false soldering, desoldering, and short circuits.

The power switch of one or more of the 3 series connected devices is not turned on, and the acoustic signal is interrupted.

Solution: Turn on the power of the audio device.

The sound source buttons of the 4 mixer input channels are misplaced.

Solution: Place the sound source switching button correctly.

(10): The microphone is inserted into the mixer for silent signal

The microphone switch has poor contact, the microphone switch is not turned on, or the microphone is damaged.

Solution: Check the microphone cable, turn on the microphone switch or replace the microphone.

(11): When holding the stage wired microphone, it swings slightly, and the sound reinforcement box makes a clicking sound

1. The microphone switch has poor contact.

Solution: Replace the microphone switch, or re-solder the switch wiring.

2. The microphone terminal is disconnected, or the shielded wire touches the signal wire.

Solution: Disassemble the XLR plug socket, solder the disconnected wire firmly, separate the shielded wire from the signal wire clearly, and solder firmly.

(12): When the single-channel microphone is connected, the volume is larger. When the two microphones are connected, the volume decreases instead

The signals input to the mixer from the two microphones are in phase.

Solution: If each input of the mixer is equipped with a phase invert button, press one of the two microphone inputs. If there is no phase invert button on each input of the mixer, , then solder one of the microphone signal wires, swap them, and then solder them firmly.

(13): After the wireless microphone is turned on, there is no sound when speaking into the microphone

1. The battery on the wireless microphone is insufficient.

Solution: Replace with new battery.

2. The tuner volume is not turned on.

Solution: Turn on the tuner volume switch and exceed 3/5.

3. The angle of the tuner receiving antenna is not adjusted properly.

Solution: Change the tuner antenna receiving angle to avoid dead spots in the host activity area.

(14): There is output on the left and right channels of the audio source, but no sound signal is output after entering the mixer

1. The fixed value attenuation button of the corresponding input channel on the mixer is Press.

Solution: Pop up the fixed value attenuation key of the corresponding channel on the mixer.

2. Place the gain adjustment on the corresponding channel at the lowest position.

Solution: Turn on the gain adjustment of the corresponding channel and place it at the 2/3 position.

3. The panning knob on the corresponding channel is placed opposite to the input left and right channel signals.

Solution: The position of the sound image adjustment button on the corresponding channel is consistent with the input left and right channel signals.

4. The plug of the input mixer has poor contact or is disconnected.

Solution: Check the input plug and solder it firmly.

5. The output end of the mixer has poor contact or desoldering.

Solution: Check the mixer output plug, connect it correctly and solder it firmly.

6. The input signal is not programmed into the corresponding output bus.

Solution: Press the program button of the corresponding output.

(15): The sound playback of the left and right channel speakers is unbalanced

1. The sensitivity of the left and right channel speakers is different.

Solution: Adjust the output levels of the left and right channels so that the speakers sound nearly consistent.

2. The left and right channel output power signals are unbalanced.

Solution: Adjust the device input level for each channel to approximately the same indication.

(16): One of the tweeters (tweeters) of the left and right channel speakers has no treble.

The tweeter of this channel is overloaded and burned out.

Solution: Swap the two input signals of the power amplifier. If the tweeter of the speaker still has no treble, it means the tweeter is burned out and the voice coil should be replaced.

(17): The left and right channel speakers are split type, and the sound produced by each speaker is uneven

The frequency dividing point of the two-channel electronic crossover is not adjusted properly.

Solution: According to the use of the frequency divider, carefully adjust the crossover points of the high and low ends.