First, avoid pressing buttons and adjusting various knobs
Although there are simple and complicated mixers, the number of channels (number of channels) is more or less. In the case that we are not familiar with the sound station or do not understand the field system connection and the use requirements, it is forbidden to press the buttons and adjust the various knobs.
The mixer is the core equipment of the sound system. Different systems have different connection methods. When the system is commissioned, the relevant knobs are already in working condition. If we randomly press, it will destroy the working state and light. The effect is destroyed, and the heavy one may cause silent and system equipment damage.
Second, avoid tuning the channel gain knob
Each input channel of a typical mixer has a gain selection button (with 20 attenuation and attenuation) and a gain adjustment knob. The purpose of these two buttons is to control the size of the audio signal entering the channel. If the signal is too large, the input amplifier will be saturated, and the audio signal will be seriously distorted. If the signal is too small, the sound will be light or the signal-to-noise ratio will be reduced, which will affect the sound reinforcement effect. Never adjust the channel gain knob. The correct approach should be: select the gain selection button based on the type of input signal. There are two options for this button. If pressed, it will attenuate 20-30dB (depending on the mixer); if it is not pressed, it will not decay. When we input the microphone type signal (the size of this type of signal is usually a few millivolts), we do not need to press the attenuation button; when we input the line level signal (such as DVD, deck, etc., the size of this type of signal is generally For 100-200 millivolts, you must press the fade button. In the second step, adjust the gain adjustment knob to the correct position. When the PEAK indicator is bright or steady, the knob is turned 5-10° counterclockwise (one tick mark).
Third, avoid using or using parametric tone controller
The general mixer has a 3- or 4-parameter pitch controller with 6 or 8 knobs. These knobs are divided into two categories: one is gain control, labeled -10 - +10, and the other is frequency knob, which selects the frequency of boosting or attenuating according to the needs of the site. The adjustment of these knobs requires a certain tuning experience. In the case of unfamiliar or lack of tuning experience, please do not arbitrarily adjust these knobs, especially the gain button, which is generally at “0”.
Fourth, avoid paying attention to the sound image adjustment button
In each input channel of the mixer, the pan adjustment button PAN is set, and L or R is marked. When the knob is rotated to the L position, the signals of the channel are all transmitted to the L channel output. When it is rotated to R, it means that all the signals of this channel are transmitted to the R channel output. When it is in the middle position, it means that the L and R channels of this channel have outputs. According to the general sound reinforcement requirements, when the microphone does not emphasize the sound image position, the PAN is in the middle position, as a stereo signal input (such as DVD, deck, etc.) and the system is a two-channel sound output form, if two inputs are used. For the channel, the PAN of one channel is at L, and the PAN of the other channel is at R. Do not blindly adjust the tone. The stereo input channel has the balance knob in the middle.
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