What is the difference between a line array and a point source speaker?

A point source loudspeaker radiates from a single acoustic centre, and level falls off at 6 dB for every doubling of distance as energy spreads across an ever-larger spherical surface. A line array assembles multiple drivers in a vertical column so they behave as a single coherent line source; in the near field, level falls at only 3 dB per doubling of distance because energy spreads across a cylindrical surface rather than a spherical one. This difference is significant over long throw distances. Beyond the level falloff advantage, line arrays provide vertical directional control through the coherent interference of their stacked drivers. A curved J-hang allows the system engineer to distribute vertical energy across the audience plane, concentrating output where it is needed and reducing energy aimed at the ceiling or floor. Line arrays are not universally superior. In small rooms the minimum throw distance means front rows can be in an uncontrolled coverage zone. Point source loudspeakers cover short distances well, deploy without specialist rigging, and cost less. The correct choice depends on venue geometry, throw distance, and budget.