Enterprise hotline:020-86064436| After-sales hotline:020-26269545

News

Manufacturer of integrated audio and video solutions

News

How to solve the problem of loud stereo noise? Three tricks to teach you to get it done!


The use of sound is very extensive, small to home sound, large to the conference room sound reinforcement, outdoor performances will be used. And careful friends may find that some speakers when you stand near it, you can hear a very obvious noise inside, just like the sound of aging wire leakage, even more noisy and ugly! But in some relatively professional occasions, perhaps you are standing under the speaker, do not feel any noise! The size of the noise will naturally directly affect the audience's experience, and on the project will directly affect the views of Party A and even the acceptance of the situation!

How can we reduce the noise as much as possible? First of all, turn off (or unplug) all the equipment such as mixer effector audio processor! The whole system does not have any input, just connect the power amplifier and the sound box, turn the knob of the power amplifier to the maximum position, and listen to the noise of the sound box at this time! If the noise from the sound box at this time is too loud for you to accept, even as loud as the roar of the engine, congratulations, the power amplifier/sound box you use is too watty! Consider changing equipment!

If there is no obvious noise according to the above, at least the background noise of the power amplification and reduction part composed of the power amplifier & speaker is not large, the equipment of the whole system can be set up normally. Once the construction is completed, turn on all the equipment excitedly, and you will find that you haven't spoken or played songs yet, and the noise is loud again! Don't worry, this is a normal phenomenon, because all audio processing equipment has a certain background noise, and it is generally more obvious than the power amplifier. The noise of so many equipment adds up, it must be heard clearly. So what do we do? Let's recall that when we obviously hear the noise, it is often when the speaker has not played music or speech? If you think about what the sound reinforcement system is for, it amplifies the sound to a larger sound pressure level on the scene, which can often amplify the human voice/music to a very exaggerated extent. Compared with the sound of normal meetings/performances, the noise of this equipment has long been covered. However, the meeting/music is not continuous for 24 hours. As soon as the voice/music stops, "Zi La Zi La" immediately runs out. In order to solve the problem that the bottom noise of the system is obvious when there is no audio input, the concept of noise gate should be introduced.

The noise gate, as its name implies, can reduce the normal noise in the system. It is like a sluice in a reservoir, but it intercepts the silt at the bottom of the water. If the sluice is too low, the silt in the water will flow down over the sluice; if the sluice is too high, it will not only stop the useless silt, but also the useful clean water. Therefore, the threshold level of the noise gate, that is, the threshold (THRESHOLD), should be adjusted to just right, just like the sluice in the reservoir. Of course, in order to completely intercept the silt, we can appropriately raise the height of the sluice, so that although some clear water is intercepted, it is also foolproof, which is worth it.

Simply put, the noise gate is like a gate, the noise of the system is like a small but sediment-mixed water flow, and the volume or other sound source picked up by the microphone is like a large and clean water flow. When no one is talking or playing music, the small current of system noise cannot open the gate of the noise gate, so no sound will enter the amplifier. At this time, refer to the first point. Only the power amplifier & speaker has a very small bottom noise, which is definitely acceptable as long as the equipment is passable. When someone talks or plays music, the big current of these music signals will burst open the gate, and the noise and the vocals/music will come out together, but the noise is like a small amount of sand diluted by the sea, and it cannot be heard at all.

The above two points are over, but the equipment is dead and the people are alive. According to the above, although we can find and solve the problem of large noise in most projects, we will always encounter some other strange problems and situations. At this time, this is the most important third point! You need to be able to help you according to the scene, the actual solution of various sound reinforcement system problems of professionals or channels! In fact, friends who do engineering may not know how professional the mixer is, and more often they get technical support from manufacturers who buy audio equipment, so they must find manufacturers with professional and reliable after-sales technical teams, such as us Lei Tuo ha ha ha! pay attention to Rattop public number, get more useful information oh!

Links