How to avoid noise in the mobile stage sound system?

There are very few things to avoid noise from the sound on stage, because the equipment is also improving.

If you want to avoid his noise, then you need to take other protective measures to solve it.

When the sound reinforcement system increases the volume of the microphone or increases the output power of the system, the sound emitted by the speaker enters the microphone directly or indirectly, and when the phase and intensity of a certain frequency in the sound are available, the system will form feedback, that is, it will form self-excitation at this frequency, which is also called howling. The frequency of whistling mostly occurs in the middle and high registers, which is a very annoying phenomenon. In severe cases, the performance cannot be carried out, and it can even burn out the voice coil of the tweeter.

If you avoid noise from the stage sound system, you are still a man.

How to avoid noise in the mobile stage sound system, this needs to control some airflow.

This phenomenon is caused by improper use, and the use of the speaker is as follows:

1. Before turning on the speaker, turn all the volume knobs down.

2. Turn on the stereo and wait for the delay protector to "rattle" before operating.

3. Turn the volume potentiometer to 2 3.

4. Turn on the microphone switch, and then slowly twist the microphone volume knob, the microphone is as far away from the speaker as possible, the microphone pickup port is not aimed at the horn mouth, slowly increase the volume, when the speaker in the speaker is about to emit a "silk" sound, at this time, the microphone has the highest sensitivity, knock the microphone with your hand, it will make a "dangdang" sound, the volume knob should not be opened wider, and then the horn will make a whistling sound, and the whistling sound is also called back to the sound of transmission. As shown in Fig

If the retransmission sound is very strong, it is fatal to the horn, power amplifier block, and power supply circuit. Therefore, try not to make a whistling sound when using it.

5. The reason for your whistling sound may be that the speaker is too close to the microphone, or the microphone volume is turned on too much.

This is called excessive positive feedback.

You can change the position of the speaker and adjust it.

Avoid placing the microphone next to the speaker.

Whistling is a physical phenomenon, that is, the sound of the microphone is amplified after entering the sound system, and the sound after the loudness enters the microphone of the radio, so that the sound is infinitely amplified after the cycle.

The power of the audio system will increase when the sound is roaring, and when the power of the audio equipment reaches its peak, it is easy to burn out.

In general, we try to avoid getting too close to the sound system when singing.

1. The distance between the microphone and the speaker needs to be controlled.

2. Pay attention to the method of holding the microphone.

3. Let the technician do a debugging.

The easiest way to do this is to install a acoustic suppressor, which can effectively deal with acoustic noise.

If we suddenly encounter the sound system howling, the most direct way is to turn off the power of the power amplifier, otherwise it is easy to burn out the speaker, and the more serious power amplifier will also be short-circuited and burned out.

In use, avoid the microphone facing the speaker, generally one or two microphones are not easy to howl. The most important thing is that the two devices such as speakers and microphones should be good enough and the curves should be flat enough. When renting professionally, 8 out of 12 microphones should also be used normally.

Abstract: Stage lighting and sound rental, I believe that everyone must be familiar with the sound, we have encountered the sound of noise, often this sound will make people feel particularly uncomfortable and extremely irritable, then you know what is the reason for such noise, then let's introduce it to you! 【Stage Sound Noise】Do you know what are the reasons for the noise of stage sound equipment.

I believe that everyone must be familiar with the audio,Everyone has encountered the situation of sound noise,Often this sound will make people feel particularly uncomfortable and extremely irritable,Ruler key, then you know what is the reason for such noise,Then let's introduce it to you!

Clause. 1. Stage lighting and sound leasing - electromagnetic burning radiation.

Electromagnetic radiation will produce such noise, this situation is known to everyone, such as the interference of common mobile phones, walkie-talkies and other communication equipment will also appear noise, so if you want to have a good sound effect without noise, it is recommended that when you use audio equipment, it is best not to point to mobile phones and other electronic devices close to audio equipment.

Clause. 2. Stage lighting and sound leasing - power interference.

The interference noise of the power supply, whenever there is noise in the audio equipment, is generally not up to standard when we are in the whole audio engineering design. If you want this to happen, it is best to separate the power supply lines in the private room when designing the lighting and sound rental project.

Clause. 3. Stage lighting and sound leasing - equipment interior.

The noise generated inside the audio equipment, if the quality of the purchased speaker equipment is not sleepy, there will also be noise problems. Therefore, when you buy or rent audio, you must check the audio equipment clearly.

1 Prepare for the show.

1) Try to arrange the speakers in front of the performance area, that is, the use range of the microphone is behind the speakers as much as possible.

2) After determining the microphone to be used according to the program of the whole performance, the microphone number should be marked on the microphone and the corresponding mixer input channels (i.e., faders), and the sound should be tested one by one to confirm that the number of microphones corresponding to the mixer is correct. This prevents the wrong microphone from being picked up in the raise, which can cause unwanted whistling.

3) Under the premise that the total output fader and peripheral equipment and amplifier of the mixer are adjusted, the gain of the mixer is adjusted according to different sound sources, and then the range that may occur during the performance will be determined to be auditioned, and the fader will be pushed to the critical state of whistling and then the fader will be slightly **, and the position of the fader will be marked (for the microphone used in a fixed position during the performance, only the sound can be auditioned near the position.)

1. In order to avoid the phenomenon of whistling during the performance, all preparations should be made before the performance. Place the speaker position in front of the performance area as much as possible, and the range of use of the microphone should be behind the speaker as much as possible, especially the wireless lavalier microphone is easy to self-excite, and the range of use of the microphone should be slightly farther away from the back of the speaker as much as possible.

2. After determining the microphone according to the performance program, mark the microphone number on the input number of the corresponding mixer one by one to confirm that the number of channels on the microphone corresponding to the mixer is correct, so as to prevent the microphone from being raised by mistake and causing the microphone to produce whistling.

3. On the premise that the peripheral equipment and power amplifier are well debugged, then adjust the gain of each input of the mixer to different sound sources. Generally speaking, the band uses ordinary dynamic and condenser microphones, which can be pre-set to -60db--50db, and the higher output level of condenser type can be pre-set in the range of -30db---20db. Then try the range of activity of the microphone used in the performance area, test the wireless microphone and test whether the wireless microphone is drifting, and then put the fader a little more, and remember the position of the fader (now there is a group after tuning, and it is better to use the group to debug).

The use of the microphone during the performance should be operated near the fixed position, and try not to exceed the fixed position.

Solutions for professional stage sound systems to encounter noise:

Turn on the sound system.

The sequence of booting is turned on step by step according to the order of the signal flow. After turning it on, there is noise coming out of the speakers. First of all, you can turn off the power of the wireless microphone receiver and listen to whether there is still noise, if the noise disappears, it proves that the noise is generated by the wireless microphone receiver

If there is still noise, it proves that the noise is not generated by the wireless microphone receiver and can be detected by other units.

You can turn off the sound gain knob of each other microphone in turn.

If the noise disappears when the knob of a microphone channel is turned off, it can be determined that the noise is generated by this channel. If the noise persists, the other units are detected.

Peripheral devices can be turned off and listened to in turn.

Continue to shut down and identify peripheral equipment such as *** machine, mixer, effect processor, exciter, voltage limiter, equalizer, electronic crossover, power amplifier, acoustic feedback suppressor, etc., and observe whether the noise disappears. If the noise disappears when a cell is turned off, it proves that the noise was generated by the cell.

Specific checks. After discovering the unit that produces noise, you can open the casing and perform a specific inspection of the structure in the machine to check whether the circuit board jumper wires, sockets, interfaces, and connectors are in good contact. The components are not charged and charged to be detected, and faulty or damaged parts can be found with maintenance capabilities. If there is no repair capacity, the unit will need to be replaced with a new one.

Systemic problems, problems that are difficult to target, generally speaking, the equipment is not good enough to account for more than half, technology is also related, a single device itself is normal, but it may not be normal when connected. Just like a person, you don't have any major problems, and a team has all kinds of problems and contradictions. Yin Xiang focuses on differential drive technology speakers, which are light in weight, high in power and good in sound quality.

1. Working grounding, also known as system grounding, is to ensure the normal operation of the system, prevent the system from oscillating and ensure the reliability of the equipment in the system. For example, the usual 220V power supply is grounded at the neutral point of the transformer.

2. Logic grounding is a grounding set to obtain a stable reference potential, also known as the DC midpoint.

3. Shielding grounding is the grounding installed to prevent the impact of electromagnetic induction on the system, which is the most complex of all grounding, because it not only prevents others from interfering at the same time, but also prevents others from interfering with others. The higher the interference frequency, the denser the metal mesh should be for shielding, otherwise the effect will not be achieved.

4. The signal grounding is installed to ensure a stable reference potential, which is the reference material mentioned above.