Audio power distribution is very important. How to unify the relationship between the main expansion and listening monitoring

Power distribution of main audio system

The power distribution of the main speaker system for sound reinforcement shall be based on the determined number of combined units and the undistorted power condition of the power amplifier. For the drive of the speaker, it can adopt the mode of pre-stage frequency division or power frequency division. In order to ensure the rationality and reliability of the speaker system in the hall, special treatment must be made in the grouping and wiring technology of power distribution.

In large halls, in order to make the speaker system have a better sense of orientation, better enable the audience to "see" the speaker, so that the visual and auditory directions are basically the same, because for hearing, the sense of horizontal orientation is more sensitive, while the sense of vertical orientation is relatively late and pure.

If the proper delay is inserted into the main speaker system, the Haas effect is used to move the sound image down, and the direction of the speaker system and the sound source is more consistent, the listening effect will be improved.

The auxiliary speaker systems other than the main speaker system generally have different types, such as ceiling speakers for background music playing in corridors and rest rooms, combined speakers or small voice columns for small VIP meeting rooms, etc.

In this case, the speaker shall be properly grouped according to the power, impedance (or voltage) and quantity of the selected speaker, and connected with the power distribution board after necessary parallel and series processing. According to the total power distribution, the connection circuit which can be switched with the power amplifier is designed, and the standby amplifier system is selected, so that it can be easily controlled and operated in the sound reinforcement control room. In addition, it is necessary to determine the power of the back listening system and the monitoring system.

Hearing back system and required power

The return listening system is a special sound system established to solve the problem of listening sense of actors and bands on the stage. When performing, actors and bands are located behind the speakers in the main sound field. If they can't hear their own voice effects, they can't find out the feeling of performance. Therefore, for the sound system of the theater and dance hall, besides the sound system of the main sound field, the return listening system is also indispensable.  

In addition, when the sound system of the main sound field breaks down, the back listening system can also be used as an emergency sound system to avoid a cold situation. In general, the power of the hearing system is 20% of the power of the main sound field. For example, if the power of the main sound field is 2000W, then the power of the return listening system should be 400W.

In the return hearing system, in order to make the return hearing loudness appropriate and the effect clear, the power of the return hearing amplifier should be about 1.3 times of the power of the return hearing speaker. In actual use, the output power of the return hearing amplifier should be adjusted on site. If the power of the back listening system is too small, it will make the back listening system meaningless. If the power of the back listening system is too large, it will generate noise and win over the host, and it is easy to cause the bad effect of sound feedback. Therefore, special attention should be paid to the adjustment of the volume and effect of the hearing system.

Monitoring system and required power

The monitoring system is a special sound system established to solve the problem of the sound operator's sense of hearing in the control room. During the performance, the main speaker is located in the main sound field of sound insulation with the control room. The sound operator cannot directly hear the sound effect of the main speaker and the situation of his own tuning, so he cannot work.

Therefore, it is necessary to install a set of monitoring system synchronized with the main sound field in the control room to help the sound operator understand the sound effect of the main sound field, so as to adjust the sound at any time. Therefore, for all kinds of hall sound system, monitoring system is also essential.

In general, the monitoring system power is 10% of the main sound field power. For example, if the main sound field power is 2000W, then the monitoring system power can be 200W. In the monitor system, in order to monitor the undistorted sound effect, the monitor amplifier power can be equal to the monitor speaker power.

In practice, the output power of monitor amplifier should be adjusted on site. If the power of the monitoring system is too small, it will make the monitoring system meaningless; if the power of the monitoring system is too large, it will make the control room too noisy and affect the work of the audio operator. Therefore, the monitoring system should be adjusted to the appropriate loudness before the program starts.

The total power of the ultra-low speaker can be 0.5 ~ 1.5 times of the total power of the main speaker. The disco dance floor should be set at the upper limit, and the multi-functional hall can be set at the lower limit; it is only limited to the occasions of language reinforcement, and it can not be equipped with ultra-low speakers.

Other surround speakers. The power of back field speaker and echo speaker can be 1 / 10 to 1 / 2 of the main speaker.