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6. Do not pay attention to the coordination of shunt volume fader and main output volume fader

Both the shunt volume fader and the main output volume fader can control the output of the mixer, but how to use them is important.

Generally, for the shunt volume pusher, we need to open the output Vu meter of the channel. When the shunt volume pusher is at the 0dB position, adjust the gain selection button and gain adjustment button of the channel so that the VU meter or led in the monitoring state is at the 0dB position (for example, the yellow light is on when the LED is displayed).

Each channel is basically the same. Then, according to the requirements of on-site sound reinforcement, adjust the main output volume fader to the appropriate state. Do not push things at random, so as to minimize the compression of the dynamic range of the signal and maximize the signal-to-noise ratio.

7. Do not turn off unused volume faders in time

The volume fader of each branch corresponds to the input signal of that branch. When the channel is not used, that is, after the speech is over or the music signal is stopped, the volume fader of the channel shall be closed in time to avoid picking up useless sounds, which are fed to the sound reinforcement system through the mixing console.

This is the need for tuning. Because the volume fader is not turned off in time, all kinds of interference sounds around are played out indiscriminately, which affects the sound reinforcement quality. At the same time, the microphone is often pushed away from the speaker when the speaker is not using it, and its use angle changes, which is very easy to produce sound feedback and howl; On the other hand, it also respects the needs of people. As the volume fader is not turned off in time, playing some private conversations on the rostrum will cause misunderstanding and jokes.

Therefore, it is necessary to form the habit of closing the volume fader of the unused mixer input channel in time. It is forbidden to push things and go away to do other things.

8. Turn on the phantom power switch randomly

Generally, phantom power supply is set on the mixer, which is mainly due to the need to apply polarization voltage when using condenser microphones.

This phantom power supply is generally controlled by the main switch and the shunt switch. Press to turn it on, and then press to turn it off. The voltage is 48V, 15V or continuously adjustable. Select according to the requirements of condenser microphone.

The phantom power supply is applied directly to the condenser microphone through the microphone connection line (in the balanced connection method, through ② + ③ -). For this reason, we can only turn on the phantom power when we use the condenser microphone and the balanced connection method. In other cases, we should confirm that it is turned off. Otherwise, either the microphone will be silent and cause trouble, or the phantom power supply will fail.

The above 8 points are small details that we haven't noticed during the tuning process. Often, the success or failure is in the details. You should pay more attention to it in the future.

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