"Line array"( more precisely,vertical array) has become more and more popular,becasue they can provide consistent level
from front to back in deep rectangular ( flat or slightly  sloping ground).
Vertical hanging multiple speakers can produce narrow vertical diffusion scopr line source:a correct-designed line array produces wave-front characteristice like a plane wave( distance doubled,output 3dB loss) or like a spherical wave (distance doubled,6dB).

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