General audio engineering FAQ.School outdoor activity audio

　　1. The problem of signal distribution: When there are several groups of speakers in the sound field, a balancer is often used to distribute the signal to multiple power amplifiers to promote the speakers. But at the same time, it is also possible that power amplifiers and speakers of different brands and models are mixed together, which will bring many problems in signal distribution, whether the impedance can be matched, whether the level distribution can be balanced, whether the power obtained by the speakers is normal, and whether it is possible to use a balanced It is difficult to adjust the sound field and the frequency characteristics of the speakers.

　　2. The problem of frequency adjustment of the balancer shown in the figure: There are three common spectrum wave shapes: swallow-shaped, peak-shaped, and wave-shaped. The above waveforms are all imagined by the tuner. In fact, they are not the waveforms required by the sound field. We know that The ideal sound field frequency characteristic curve should be relatively flat. If artificially adjust the sound field frequency characteristic curve by imagination, the result is unbelievable and counterproductive.

　　3. Compressor adjustment problem: It is common that the decoration basically does not work and the excessive effect is counterproductive. The former can be used improvised, while the latter will seriously affect the dynamics of the system, which means that the sound cannot be produced. The obvious performance is that the stronger the accompaniment sound, the natural weakening of the sound, making the singer at a loss.

　　4. System level problem: First, the power amplifier flexibility control switch is not turned on, and secondly, the system has not done zero-level adjustment. Sometimes the mixer channel is pushed a little and the output is too large, this situation will affect the dynamics and distortion of the system.

　　5. Bass signal processing: The first type uses full-frequency signal directly to the power amplifier to promote the speaker without electronic frequency division; the second type does not know where to extract the bass signal from the system for processing. Assuming that the full-frequency signal is not used for electronic frequency division, the full-frequency signal is directly fed to the power amplifier to promote the speaker. Although the speaker has sound, it will not burn out the unit, but the full-frequency sound of its low unit is inconceivable; but if the signal is obtained from an inappropriate position in the system, it will also give Field control brings unnecessary trouble.

　　6. Effect loop processing: The post signal of the fader should be taken to prevent the effect from being uncontrolled and causing the microphone to whistle. The return conditional occupies one channel, which makes debugging more convenient.

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