Common problems and solutions of sound installation in engineering

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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 signals to several power amplifiers. At the same time, however, it may be that different brands of power amplifiers and speakers are mixed together, which will cause many problems in signal distribution, such as whether impedance can be matched, whether level distribution can be balanced, whether the power obtained by speakers can be normal, and it is difficult to adjust the frequency characteristics of sound field and speakers with one balance.

2. Figure shows the frequency adjustment of the balancer:

There are three kinds of common spectrum waves: swallow-shaped peak-shaped wave-shaped wave. The above waveforms are all figures imagined by Andhadhun people, but they are not waveforms required by sound field practice. We know that the ideal sound field frequency characteristic curve should be relatively flat. If people adjust the sound field frequency characteristic curve by imagination, it is inconceivable that the result will be counterproductive.

3. Adjustment of voltage limiter:

It's common that decorations basically don't work and excessive effects are counterproductive. The former can make do with it, while the latter will seriously affect the dynamics of the system, which shows that the sound can't be sent out. Obviously, the stronger the accompaniment sound, the weaker the sound will be, and the singer will be at a loss.

4. System level problem:

First of all, the power amplifier flexibility control switch is not turned on, and secondly, the system has not made zero-level adjustment. Sometimes, a little bit of output from the mixer channel is too big, which will affect the dynamic and distortion of the system.

5. Bass signal processing:

The first kind of loudspeaker box is directly propelled by full-frequency signal to power amplifier without electronic frequency division; The second is to extract the bass signal from the system for disposal. Assuming that the full-frequency signal is directly used to propel the power amplifier without electronic frequency division, although the sound of the speaker won't burn out the unit, it's inconceivable that the low unit will make full-frequency sound. However, if the signal is obtained from an inappropriate position in the system, it will bring unnecessary trouble to the field control.

6. Effect loop disposal:

The rear signal of the fader should be taken to prevent the uncontrolled effect from causing the microphone to scream, and it is easier to debug when it returns to the conditional channel.

7. Line connection process:

The common AC interference in the system is loud because the line connection process is not done well, and there are balanced to unbalanced and unbalanced to balanced connections in the system that must be connected according to the specification. In addition, don't use inferior connectors.

8. Control problems:

The mixer is the control center of the system. Sometimes, if the balance of high, middle and low EQ on the mixer is raised or attenuated by the same magnitude, it means that the system is not well adjusted, so it is necessary to re-debug the system. Don't over-adjust the EQ of the mixer.