　　
To build a high-frequency sound system problems <br> how to identify various types of speakers during the construction phase axis, and the sound of it directed most reasonable position?
First of all, we need to know where the application axis of each type of speaker system we use is.
Take the standard point source two-way speaker as an example: the axis of this speaker has three, which are the treble axis at the center of the treble horn, the bass axis at the center of the low frequency unit, and the crossover axis at the center position between the high and low sounds.
The nominal directivity of a loudspeaker is usually the physical angle of the horn used to control the tweeter. The angle coverage of the speakers involved in our design mostly refers to the mid-high frequency part controlled by the horn, and the low-frequency part does not follow the nominal directivity control. Therefore, in the application, the directional axis used to adjust the speaker's tilt angle refers to the center point of the speaker horn position.
note! The directional axis of a linear array speaker product is at the center of its linearly aligned overall length! The linear axis of the linear column product is at the center of its long side!
When the directional axis of the speaker system is determined, how to accurately adjust its directivity to the specified position?
Usually 3 effective methods are used:
Use homemade laser rays!
First, select a relatively short green or red laser flashlight as a linear projection light line. Secondly, disassemble the magnet of a tweeter, remove the T iron of the magnet, and retain the complete magnet as the base. The outer diameter of the magnet is about 10CM, and the inner diameter is about 4CM. Finally, the laser flashlight is fixed to the inner ring of the magnet, and the plastic glue stick is heated and filled to ensure that the laser torch is completely perpendicular to the magnet, and can be used after the glue stick is cooled.
When using, just magnet the magnet to the treble axis position of the speaker stencil, adjust the vertical angle, and the laser line will point to the position you need. This method is relatively accurate.
Use the actual simple measurement method!
Through various types of measurement software and equipment, test microphones are placed in the last row of the audience area, and the noise of the high-pass filter is played in the speakers covering the area (the high-pass filter frequency is determined according to the frequency division point of the speaker, for example The frequency divider frequency of the speaker is 1.5KHz, and the frequency of the high-pass filter should be selected above 1.5KHz. Adjust the physical vertical angle of the speaker covering the area to observe the maximum sound pressure of the measurement acquisition microphone.
Choose smart directional control speakers!
Regardless of which of the above methods is used, it takes time for the engineer, and once the sound coverage angle needs to be temporarily adjusted during the performance, the scene becomes very embarrassing.
So once and for all, the solution is to choose a speaker with intelligent adjustment of directivity control, saving time and effort and ensuring the performance. For example, the adaptive system of the EAW family is simply the conscience of the industry!
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