The literal meaning of "matching" sometimes causes misunderstandings. Customers often ask me: "Can I bring my own wireless microphone to match your mixer?" I said that it can be matched, as long as the microphone output is an analog output, it can be matched. In fact, the microphones we use today are all analog outputs, and there is no problem of matching mismatch. The matching of the sound system is not the same as the concept of computer operating system and software compatibility matching. If the audio system is transmitted by digital, it involves the protocol problem of the digital interface. The digital interface of different protocols cannot communicate.
This is a matching problem that the customer understands. In the matching of the amplifier and the mixer, we should pay attention to "level matching and impedance matching".
We all know that if the level is too high, the device will produce Xiaobo distortion and even burn the speaker unit. However, we pay little attention to the negative effect caused by the low level. When the system level is too low, the following negative will occur. effect:
1. Reduce the signal to noise ratio of the system. The signal-to-noise ratio is the proportional relationship between the active component and the noise component in the sound signal. There are two kinds of system noise, one is the noise caused by the working heat of the electronic component, and the other is the environmental noise picked up when the microphone is turned on. At the same venue, these noises are relatively stable. How do you improve the signal-to-noise ratio during the performance?
If it is a music signal, try to increase the gain of the music signal (but not Shaw). If it is the signal of the microphone, it can not only increase the gain, increase the gain, and the ambient noise will increase accordingly. At this time, the person who needs to use the microphone should try to increase the sound volume to improve the signal-to-noise ratio more effectively.
2. Overwhelm the weaker details of the music. This concept is usually ignored. It is generally considered that the gain of the mixer is enough for the system to have a certain sound pressure. It is not necessary to open to the maximum undistorted state. But if so, the details in our music will really be lost. From the principle of signal-to-noise ratio, it is not difficult to understand the reason for being lost.
The music is recorded in the studio. The recording conditions of the studio are much better. When recording a piece of music, such as when the volume of one of the instruments is below 40dB, it will be clearly picked up, and when the instrument is on the scene. During playback, noise above 40dB in the field will drown the sound of the instrument. At our performance site, the noise is basically higher than 40dB. Only by maximizing the gain of the music signal can the music signal be amplified as much as possible to achieve the purpose of improving the signal-to-noise ratio.
It can be seen that level matching is very important in the system, and whether it is a large level or a small level, it will cause a negative effect. Today I will introduce you to a level matching experience, how to properly match the system level without knowing any device specifications.
Step 1: The amplifier input level knob is set to a minimum, and a test music is prepared to adjust the system level. Well, it is to test the music because the volume of the vocal signal is unstable and the test is not accurate. [Note: Music signals must be tested under the premise of impedance matching, otherwise it will cause distortion (impedance matching will be introduced in future articles)].
Step 2: Adjust the level of the player. If it is a CD player, there is no need to adjust. If it is a computer, adjust the volume output of the computer to the maximum (0dB).
Step 2: Push the fader of the music input channel and the output bus to 0dB, and increase the gain of the mixer until the bus output level shows the maximum but does not appear Xiaobo. [Note, there is no audience at the time of the general test. After the audience enters the scene, the sound will be absorbed, and the sound pressure will not feel enough. Then, during the test, the fader of the music channel can be less than 0dB, leaving a certain margin];
Step 3: Check the peripheral processing equipment - such as the level of the equalizer, to ensure that there is no Xiao wave, if it occurs, reduce the gain of the music mixer;
Step 4: Turn on the power discharge flat knob until the sound pressure required by the scene is met (sometimes the power discharge flat knob will open very small, sometimes it may open to the head, it doesn't matter, the sound pressure is enough).
At this point, note that if the power amplifier rear panel has a gain switch function, you need to know the parameters of the power amplifier connected device, first set the gain switch, and then raise the level (how to set the power amplifier's gain switch, which will be introduced in a later article);
This level matching method will make the sound full and the details will be well reproduced. When the speaker does not reproduce the sound, the noise in the speaker is much smaller.
This is a matching problem that the customer understands. In the matching of the amplifier and the mixer, we should pay attention to "level matching and impedance matching".
We all know that if the level is too high, the device will produce Xiaobo distortion and even burn the speaker unit. However, we pay little attention to the negative effect caused by the low level. When the system level is too low, the following negative will occur. effect:
1. Reduce the signal to noise ratio of the system. The signal-to-noise ratio is the proportional relationship between the active component and the noise component in the sound signal. There are two kinds of system noise, one is the noise caused by the working heat of the electronic component, and the other is the environmental noise picked up when the microphone is turned on. At the same venue, these noises are relatively stable. How do you improve the signal-to-noise ratio during the performance?
If it is a music signal, try to increase the gain of the music signal (but not Shaw). If it is the signal of the microphone, it can not only increase the gain, increase the gain, and the ambient noise will increase accordingly. At this time, the person who needs to use the microphone should try to increase the sound volume to improve the signal-to-noise ratio more effectively.
2. Overwhelm the weaker details of the music. This concept is usually ignored. It is generally considered that the gain of the mixer is enough for the system to have a certain sound pressure. It is not necessary to open to the maximum undistorted state. But if so, the details in our music will really be lost. From the principle of signal-to-noise ratio, it is not difficult to understand the reason for being lost.
The music is recorded in the studio. The recording conditions of the studio are much better. When recording a piece of music, such as when the volume of one of the instruments is below 40dB, it will be clearly picked up, and when the instrument is on the scene. During playback, noise above 40dB in the field will drown the sound of the instrument. At our performance site, the noise is basically higher than 40dB. Only by maximizing the gain of the music signal can the music signal be amplified as much as possible to achieve the purpose of improving the signal-to-noise ratio.
It can be seen that level matching is very important in the system, and whether it is a large level or a small level, it will cause a negative effect. Today I will introduce you to a level matching experience, how to properly match the system level without knowing any device specifications.
Step 1: The amplifier input level knob is set to a minimum, and a test music is prepared to adjust the system level. Well, it is to test the music because the volume of the vocal signal is unstable and the test is not accurate. [Note: Music signals must be tested under the premise of impedance matching, otherwise it will cause distortion (impedance matching will be introduced in future articles)].
Step 2: Adjust the level of the player. If it is a CD player, there is no need to adjust. If it is a computer, adjust the volume output of the computer to the maximum (0dB).
Step 2: Push the fader of the music input channel and the output bus to 0dB, and increase the gain of the mixer until the bus output level shows the maximum but does not appear Xiaobo. [Note, there is no audience at the time of the general test. After the audience enters the scene, the sound will be absorbed, and the sound pressure will not feel enough. Then, during the test, the fader of the music channel can be less than 0dB, leaving a certain margin];
Step 3: Check the peripheral processing equipment - such as the level of the equalizer, to ensure that there is no Xiao wave, if it occurs, reduce the gain of the music mixer;
Step 4: Turn on the power discharge flat knob until the sound pressure required by the scene is met (sometimes the power discharge flat knob will open very small, sometimes it may open to the head, it doesn't matter, the sound pressure is enough).
At this point, note that if the power amplifier rear panel has a gain switch function, you need to know the parameters of the power amplifier connected device, first set the gain switch, and then raise the level (how to set the power amplifier's gain switch, which will be introduced in a later article);
This level matching method will make the sound full and the details will be well reproduced. When the speaker does not reproduce the sound, the noise in the speaker is much smaller.
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