Turn on the power of the sound console, and turn on the power of the sound source and peripheral equipment in the order of "small signal first, then big signal", and then turn on the power of the power amplifier. Before turning off the power, first pull each attenuation fader to the minimum position, and at the same time, adjust the power discharge flat adjustment knob to the minimum. According to the order of "first turn off the big signal, then turn off the small signal", turn off the power supply of the power amplifier and the power of the sound console and other equipment power supply.
Select the appropriate input level: The PAD set attenuation button and the GAIN control knob should be used together to adjust the input level. If the signal level is too large, such as CD, ID, VCD, DVD player, dual deck, etc., the PAD button should be pressed to ensure that the signal level does not exceed the dynamic range of the input level. When the input level is between -plus and -60dB, the GAIN knob can be used to adjust the appropriate gain.
For example, if the source is a low-sensitivity dynamic microphone (with a sensitivity of -55dB), you do not need to press the PAD button. You can place the GAIN knob at the corresponding position of -55dB. If it is a high-sensitivity condenser microphone (sensitivity is -35--45dB), you can put the GAIN knob at the corresponding position of -35--45dB, so that the input level is appropriate, and the distortion and noise are the lowest. . In general, do not move it after adjusting GAIN on a fixed occasion. Never change the volume by adjusting GAIN.
Correctly adjust the input level and input gain: the sub-level fader and the input gain control should be properly matched, such as the sub-fader is too low, and the gain is too large. When the large signal is input, the sub-fader has no downward adjustment, so it is easy to cause overload; if someone mistakes the pusher, it will have serious consequences of damaging the power amplifier and the speaker.
The correct adjustment method is:
(a) At the beginning, the sub-fader and gain knob are all adjusted to the minimum.
(b) The sub-fader is adjusted to about 70% (no more than the main fader).
(c) Slowly rotate the gain knob to the position before the CLIP lamp is not flashing. If the input channel of the channel is connected to the microphone signal, then the gain knob is rotated, and when the microphone is about to produce a howling, it is a suitable position when it is rotated back to a small level. Do not change the volume by adjusting the input gain. The overload distortion or signal-to-noise ratio caused by this is reduced. The latter stage cannot compensate. To change the signal strength of the channel, that is, the volume, the channel fader should be adjusted normally.
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