The layout method of the speaker and the attention items are introduced.

The layout method of the speaker mainly has the following：

1、Centralized layout: the layout of the sound box is arranged on both sides of the stage.

Advantages: convenient and practical, simple connection, with less lines, accurate positioning, sound to sound natural.

Disadvantages: easy to cause howling, microphone volume is not open.

Application places: indoor theatrical performances, small dance halls, clubs, multi-function hall.

2、Decentralized layout:

A plurality of suction box is arranged on the ceiling by means of a dispersing method, or a plurality of sound box is arranged on the wall and the back of the seat is arranged. Note that the speaker should choose to point to a sharp point, and should limit its distribution range. When using the ceiling speakers want to lower the ceiling as well.

Advantages: improve the direct sound pressure distribution ratio, uniform, not easy to cause howling.

Disadvantage: sound direction.

Application: voice playback, square hall PA, PA, PA, playground and multi-function hall sound reinforcement.

3、Centralized and decentralized layout:

To the centralized, decentralized, supplemented by way of arrangement. Music, theater and other sound to need accurate sound with centralized playback, sound reinforcement by distributed playback.

Advantages: the advantages of centralized and decentralized.

Disadvantages: system complexity, high cost.

Application: apply to all occasions.

4、Linear array:

The linear array sound box is designed for outdoor large-scale performances, and recently there is a kind of small products suitable for indoor. It is characterized by a sharp point, the vertical radiation angle of each speaker only 30 ~ 10 degrees and the sound box angle can be precisely adjusted, each times the distance decay is small to 3dB. It is applied to a large number of large meeting rooms.

5、Note:

When the two speaker distance is larger than or equal to 17 meters, that is, the voice to Daren ear time difference is greater than 50ms, the system must join the & quot; delayer & quot;. Otherwise will produce a sense of reverberation, the sound can not hear clearly.

When the speaker should pay attention to the following points

(1)Direct type full frequency sound box to avoid interface reflection.

(2)When the sound box is arranged, the sound of the sound area is directly obtained. In general, the speaker hanging is rooms receive direct sound the best way to adjust the tilt angle to avoid affecting the treble sound effects. The horizontal line of the speaker should be consistent with the level of the high speaker's axis and the listener's ear,

(3)Speakers placed with the central axis of the room to be symmetrical. The indoor acoustic environment is the requirement that the symmetry of the building must be consistent with the indoor acoustic symmetry, and the sound box should be placed in the center of the room. In order to provide an ideal, harmonious and symmetrical sound field in the interior of the building, only the symmetry of architecture is realized.

Frequency equalizer

The use of certain frequency equalizer will appear howling attenuation or removal, so as to achieve the purpose of acoustic feedback suppression. Both indoor and outdoor sound reinforcement system, microphone can be more or less directly receives the reflected acoustic signals, acoustic systems easily in these frequency feedback cause howling. Therefore may in the acoustic system of power amplifier before the string into the equalizer to suppress acoustic feedback.

The level often appeared on the scene in the howling howling down equalizer can use frequency point. According to the same principle through the equalizer on the console with howling frequency. Such as the actors on the stage walk. The phone often moving may cause squeaking, then the sound mixer potentiometer is used to eliminate the screaming. When an actor to the left, the channel microphone acoustic phase knob rotation to the right, according to this method treatment changes.

The use of the equalizer's specific method is: after the microphone positioning, gradually open the volume of the power amplifier, until the system is not self - excited position, then the equalizer button to the right of the position, and then down 3dB. And then adjust the buttons of each frequency band, are transferred to the position of the right to self - excited 3dB, all of the band can be adjusted. The artificially produced whistle, the equalizer to attenuate the signal can be corrected acoustic system to adapt to the different sound environment. As in live television host will keep walking, the loudspeaker to send out the audio signal and the reflected sound signal may enter the host's microphone and cause howling, because the phone often moving, then at the microphone may reach the position the microphone volume adjustment Ambassador its howling, adjust the equalizer frequency according to the frequency of whistlers to suppress the howling.