What are the common sound failures of conference sound systems?

Conference audio, if it is mainly used for meetings, must ensure the clarity of the speaker's voice. If the effect is to be used, use the hall effect, and add a little reverberation and echo appropriately. A little bit is fine.

There may be some common failures that confuse us when using audio equipment, so what are the causes of failures? And how do we solve these problems? Next, Datian Tianyun will answer you about the common fault causes and solutions of audio equipment:

The microphone is silent or comes and goesCause of failure:1.The microphone is not on the battery or the microphone switch is not on.

Solution: Attach a 9V battery or turn the microphone switch on.

2.The microphone receiver has no power supply.

Solution: Power on the microphone receiver.

3.The microphone fader on the mixer is not pushed.

Workaround: Push the microphone fader on the mixer to 0db

4.The ON switch on the mixer was not pressed.

Solution: Press the ON switch on the mixer (the indicator light is on)5The sound of the wireless microphone has been transposed.

Solution: If the battery is dead, replace the 9V battery immediately.

6.The microphone's cable is not good.

Solution: Change the cable.

There is only one channel failure cause of the accompaniment when singing:1.The left and right channels of the song ordering machine have poor contact with the skewers.

Solution: Twist the skewers of the left and right channels on the song.

2.The input skewers on the mixer are not in good contact.

Solution: Twist the left and right channel input headers on the mixer.

No effect when singingReason for failure:1.The effects fader on the mixer didn't come up.

Workaround: Push the mixer effects fader to the ODB

2.The plug of the effect is in the wrong place.

Solution: Plug the input of the effect into the AUX of the mixer, and the output into the IN3 of the mixerThere is no power indication for the effect.

Workaround: Power the effect on.

The microphone has a whistling sound or a buzzing sound when singingCause of failure:

1.The microphone is too loud.

Solution: Turn down the microphone volume.

2.The microphone is pointed at the speaker.

Solution: Remove or turn off the microphone.

3.The microphone core was covered by the hand.

Solution: Take your hand away and take the part below the microphone core to sing 4The microphone has too much treble or bass.

Solution: Attenuate the microphone's treble or bass appropriately.

When singing, the accompaniment has the reason for the failure of the original singing:1.The backing vocals were not silenced.

Solution: Silence the sound.

2.This song belongs to the singing version.

Workaround: Record the song so you can delete it next time.

The accompaniment is too small or too large when singingCauses:1.The fader on the mixer is pushed too small or too large.

Workaround: Push the fader on the mixer to the appropriate position2The knobs on the amplifier are too small or too large.

Solution: Adjust the knob on the amplifier to the appropriate position.

3.The volume on the remote control is not adjusted properly.

1. Silent.

1.The speaker wiring is broken or the crossover is abnormal. When the speaker wiring is broken, the speaker unit does not have an excitation voltage, which will cause a silent failure. Frequency dividers are generally not easy to break, but failures such as desoldering of lead joints and short circuits of crossover capacitors may occur.

2.The voice coil is broken. You can use the multimeter R 1 gear to measure the solder lug of the speaker lead-out wire, if the resistance value is , you can use a knife to scrape the sealing paint of the lead wire at both ends of the voice coil, expose the bare copper wire and then test, if it is still not through, it means that the internal wire of the voice coil is broken; If the measurement has been passed and there is"Titicaca"sound, it indicates that the voice coil lead is broken, you can solder the thread well, and solder it with another piece of enameled wire similar to the voice coil winding.

3.The speaker leads are broken. Due to the frequent vibration of the speaker cone, the braided wire is prone to breakage, and sometimes the wire is broken, but the cotton core wire remains connected. This type of braided wire is not readily available and can be replaced with a slightly longer flexible wire.

4.The voice coil burned. Measure the speaker lead with multimeter R 1, if the resistance value is close to 0 and there is no "click" sound, it indicates that the voice coil is burned out.

Before replacing the voice coil, you should first remove the debris in the magnetic gap, and then carefully put the new voice coil into the magnetic gap, straighten the voice coil, fix the upper and lower positions of the voice coil with super glue while listening, and after the voice coil is placed in an excellent position, use super glue to fill the gap between the voice coil and the paper cone to about half, and then seal the dust cover, turn the speaker paper cone up, and place it for a day before normal use.

Second, the sound comes and goes.

1.Poor speaker leads. It is usually caused by mildew or poor welding of the voice coil lead, and when the paper cone vibrates frequently, the break point is sometimes connected and sometimes disconnected, forming an irregular sound and no sound fault.

2.The voice coil leads are broken or about to be short-circuited.

3.The power amplifier output socket is in poor contact or the speaker input line is disconnected.

The conference sound is mainly good in the middle and high tones, which is suitable for people to speak.

The microphone is of high quality and the vocals are good.

Check the joints of the various cables to see if there is any dust or poor contact.

Common ones include power interference, interference between devices, and light interference.

How to deal with interference:

Power disturbances can be resolved in the following ways:

Add a power filter, use the resonant circuit to filter out harmonics, and "purify" the output power supply;

The input and output lines of the signal are routed separately from the power line, and cannot be routed in parallel to avoid adjacency and cross interference, and induct each other;

A twisted-pair power cord is used so that the total magnetic flux generated by the two wires cancels each other out.

For the phenomenon of "acoustic noise", the following methods can be taken to avoid the formation of intrinsic resonance points:

Reduced sound reinforcement gain;

Use an equalizer or automatic feedback suppressor to reduce the amplitude of the "howling" frequency;

Connect a frequency shifter or phase modulator to offset the frequency or phase to destroy the in-phase conditions between the feedback sound and the sound source;

Adjust the speaker layout, change the microphone orientation, and the distance between the two to avoid positive feedback.

For the phenomenon of "empty sound", the following methods can be used to avoid sound wave delays:

Choose a microphone with strong directionality;

Turn off the ST switch in the mixer or pull down the redundant microphone fader;

Adjust the sound source and its amplified sound ratio.

For light interference, the following methods can be taken to solve it:

The microphone cable is away from the light wire;

Microphone cable through tube shielding;

Adopt a microphone with strong anti-interference ability.

If there is a loudspeaker in the conference room, due to the small space, the distance between the speaker and the microphone is relatively close, if the volume is slightly larger, it is easy to appear whistling sound (scientific name is retransmission sound). In order to prevent piercing screams, the following points should be paid attention to when using the amplifier: 1. The speaker and the microphone should not be too close, the farther away the better.

2. The speaker port cannot be facing the microphone. 3. Before turning on the amplifier, turn off the volume potentiometer and microphone volume to the minimum. After turning on the amplifier, the volume potentiometer is slowly turned on halfway, and then the volume of the microphone is slowly increased, when you hear the horn is about to whistling, do not increase the volume, at this time the amplifier is the most sensitive.

If you don't get there, increase the volume of the potentiometer to the highest sensitivity.