The External Form of Line Array and Some Problems

When the line array speaker system is suspended, there are various forms according to the structure of the array and the actual sound reproduction requirements. The common forms are linear, arc, and so on.

Here is the content list:

• The external form of the line array

• Spherical and Cylindrical Wave Problems

The external form of the line array

Linear line array is the simplest arrangement. It has a narrow high-frequency radiation angle, and the radiation frequency is proportional to the array length. However, the high-frequency coverage angle is narrow and the control is difficult. Because, linear arrangement will radiate sound bundle, which is equivalent to slowing down the attenuation with distance.

Arc Line Array: At this time, each box of the array is arranged into an arc with a set radius. Compared with the linear array, its radiation coverage area is wider. Its radiation characteristics are related to the radius and opening angle. relatively uniform radiation.

Spherical and Cylindrical Wave Problems

One of the most discussed issues in line array speaker systems is the issue of spherical waves and cylindrical waves.

Spherical waves are waves on concentric spheres. The wavefront of a spherical wave propagates in three dimensions, and the sound pressure level attenuates by 6 dB when the distance is doubled, or the sound pressure is inversely proportional to the radius of the spherical wave.

A cylindrical wave is a wave whose wavefront is a coaxial cylinder and propagates only in two dimensions. The sound pressure level is attenuated by 3 dB when the distance is doubled, or the sound pressure is approximately inversely proportional to the square root of the distance.

Designers of line array loudspeaker systems hope to take various measures so that the line array can radiate cylindrical waves, attenuating only 3 dB from doubling the sound pressure level. However, only an infinitely long line source can produce real cylindrical waves. Therefore, it is difficult for a general line array speaker system to generate cylindrical waves.

It cannot be denied that in the initial stage of interest in the line array speaker system, some publicity was only based on the needs of the market, regardless of the scientific basis. In addition, people have not been in contact with the Line Array for a long time and do not have a deep understanding of it. The statement that "line arrays can form cylindrical waves, and the attenuation is only 3 dB when the distance is doubled" once confused.

In 2003, this statement was revised. The radiation of a line array loudspeaker system is divided into a near field and a far field. The near field can be approximated as a cylindrical wave, and the far field is a spherical wave. After the sound radiation passes through a cylindrical wave, it gradually transitions to a spherical wave.

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