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"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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