What is a Line Array?
A line array is a group of radiating elements arrayed in a straight line, closely spaced and operating with equal amplitude and in phase. Described by Olson in his 1957 classic text, Acoustical Engineering, line arrays are useful in applications where sound must be projected over long distances. This is because line arrays afford very directional vertical coverage and thus project sound effectively.
Again, proper alignment is the key to getting the best sound from any line array.