Short definition
A line array is a loudspeaker system made of multiple vertically stacked, acoustically coupled elements. It produces a cylindrical wavefront with controlled sound dispersion and is the standard for reinforcing large venues and outdoor events.
Detailed explanation
The principle relies on the coherent addition of many individual speakers into one uniformly radiating line. Unlike point-source speakers, a line array shows a much slower drop in level with distance and offers narrow, steerable vertical dispersion, while horizontal dispersion stays wide for even room coverage.
Modern line array systems are fully active and DSP-controlled, with each element carrying its own amplification. System design runs through dedicated software that simulates sound distribution before setup. Element angles follow a calculated plan: upper elements aim steeper downward for rear rows, lower elements less steep for the front. Subwoofers are usually arranged in a cardioid configuration to minimize rearward sound.
Relevance in this field
Line arrays are the industry-wide standard for reinforcing mid-size and large events. Their controlled acoustic properties deliver even sound coverage even in challenging rooms.
Practical example
For an annual conference in a trade-show hall with a 2.8-second reverberation time, a line array system with eight elements per side plus four subwoofers is deployed. Measurement shows a level deviation of just ±2 dB across the entire audience area.
Related terms
Loudspeaker, PA system, sound system