Mixer tuning skill

A simple and completed audio system, always including 4 unit, microphone, mixer, speaker box, and power amplifier. Of course the practical audio system tuner used is more complicated. When multi-channel signal input, in addition to the microphone, there are a DVD player (or CD player), cassette player, MD deck, etc. However, the entire workflow, the mixer is undoubtedly in key positions and the hub plays a connecting role, thus tuner to adjust it plays an important role. We should acquaint the function and feature before using the mixer. Mixer is a professional audio system is the most important equipment; a professional sound system is often based on the core of the mixer. Common mixer can accept 8 to 24 channels of different signals and these signals are processed in the timbre adjustment and amplitude.


In general, the mixer has four main functions.

The first function is to program signal amplification. After a variety of signals from different sources into the mixer program and its various signals are not required to put a lot of the same, so the mixer must be able to handle different signals. Various musical instruments, such as the human voice signal and the signal amplitude is not the same, of course, need to be treated separately.

The second function of the signals is separately adjusted frequency (i.e., tuning). We know that different signals, due to its spectral distribution, and other aspects of the harmonic components, the formation of a different tone, and the impact of buildings on the sound so that sounds great changes. Sound engineer PA according to different environment, different voices into the mixer signals are processed to make it sound as close to the original. Each mixer channel has the same processing means, such as: 3-band EQ, gain control, high-pass filters.

The third function is the combined signal. Mixer will be adjusted after each signal, to a variety of signals into the standard left and right channels (stereo) in the form of output; the input signal is used as a device to the next level, which is the most basic functions.

The fourth function is the distribution function. In addition to the main output of the mixer stereo , but also provide two or more auxiliary output signals , such signals have two purposes , one stereo listening room or stage to listen to ; second is to do with the effect of the excitation signal . It was also a simple function summarized as follows: * pickup signal amplification; * by the need for high, middle and bass tone equalization; * The signal sent by the need to be grouped around the bus or control; * right into the auxiliary artistic bus signal processing; * required output control . However, no matter how expression, its function is the same. The tuner must all work to the mixer function as the core to expand. Mixer features two partitions When we first came into contact with the mixer, it is easy to be on the panel, colorful, large number of knobs and putting dazzled and overwhelmed. But in fact, the significance of faders and knobs for each channel are exactly the same, so we only need to learn how to focus on one channel you can use the platform of a comprehensive master tuning. We usually are exposed to the mixer 8 to 24 of the road, less 4, while large ones up to 96 -way there even more. However, regardless of ones more or less, the control console for each path is divided into two parts, the master and auxiliary control. There are separate auxiliary signal output can be realized in the same mixer can simultaneously output mix two or more signals.

Now, let us make a channel mixer section anatomy. This is a 16-channel mixing console all the way to the circuit anatomy, signal input from the left , then the gain , EQ , volume pushed to , pan and auxiliary partial control , the final output from the right .


1 signal input port each channel has one or several specifications of the signal input port for connecting the system recorder, audio , samplers or synthesizers and other audio output port , or plug in the moving coil , a capacitor microphone and so on. Balanced inputs mainly used for microphone input, unbalanced inputs are mainly used for line input. It should be noted that, when using a condenser microphone, 48V capacitor microphone power switch must be turned on.


2 Gain knob (trim) and input firmness even usually a knob, which we call the gain knob (trim), is used to adjust the signal input, ie when the signal is too strong for him to cut, too weak when you upgrade them (sometimes , the gain knob is an attenuator button “pad” instead of when the button is pressed or lifted input signal is to do a certain level of attenuation ) . As the voice input gain knob is the first pass of the mixer, adjust the appropriate audience tuning to ensure that the processing circuit to receive the full level and “clean” signal.

3 volume faders when the gain knob set up, you can use the volume fader channel (or volume knob is usually located in the lower end of the mixer panel) to determine if the channel signal is sent to the volume of the bus. Fader is actually an attenuator output signal for the channel attenuation . When the slider is located in the lower end (located at the left or the volume knob), the attenuated signal is infinite, then, no signal is output to the channel.

4 panning (PAN) volume fader knob at the top, you can find a pan (PAN) knob, which is used to adjust the left and right stereo channel signal at the position between the speakers.

5 mute (MUTE) and Solo (SOLO) button to listen some stage between the volume fader and pan knob also designed two buttons that mute (MUTE) and Solo (SOLO) listens button. Mute button can not move the volume fader, it will mix bus signal to close the channel. When the output level of the channel has been accurately adjusted, and do not want to touch it again, this feature is obviously useful. When the button is pressed solo listening , you can listen through headphones to listen size of the channel’s signal that other solo listen button is not pressed the channel signal is not headphones .

6 balanced mixers provide the vast majority of certain channel equalization. Many are not very professional mixers are provided segmented equalization , reflected in the console is labeled “treble” and “bass” the two knobs , above , and when the two knobs to adjust lower than the frequency of the predetermined signal manufacturer , i.e. boost or attenuation. The above is also commonly referred to as two balanced, while the three -band EQ is more than one pair of bands (mid) be boost or cut the knob. Other mixers also added a selection of knobs IF point , which we call semi-parametric frequency equalization, and fully parametric equalizer IF center frequency can not only selected , but also choose to implement some frequency range boost or attenuation.

7 aux send (SEND, also known as effects send ) button is generally designed for each channel mixer 2 to 6 aux sends button. These knobs can control the channel signal is sent to each auxiliary output port (AuxSEND) semaphore signals several channels simultaneously auxiliary out to an auxiliary port through the auxiliary knob. When the effect of the auxiliary output port , a signal output from the auxiliary port via the effect of processing and returns the results to the output port of the mixer input port secondary return (AuxRETURN), followed by mixing with the bus signal . Volume control knob auxiliary signal returns are generally arranged in a part of the total wire mixer right. In the live recording, the auxiliary port can also be used to connect the headphone amplifier for multiple singers on the song while listening.

8 tape / line (Tape / Line) toggle switch is designed for large-scale multi-track recording system for each mixer channel has a tape / line (Tape / Line) toggle switch. This switch can determine the input source for each channel is independent of each rail output mic / line input source or multi-track machine. When making multi-track recording , this switch should be placed in the line input state ; After the recording is finished , when multitask mixdown signal , the switch should be placed in the tape input state, then , is to adjust each channel fader is actually more than each rail track machine semaphore signal output to the stereo bus.

Mixer tuning skills

9 breakpoint insertion port (INSERT)

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