Why does a Line Array sound better?

It is advantageous to have sound waves that drop off at 3dB's.The sound near the speaker at 90dB's will be 81dB's 100 feet away. The result is consistent sound-pressure levels for listeners in the front and back of the room. Vertical diffusion is bad in an indoor environment. Most of the reverberations and echoes in a large room, come from high ceiling reflections. High reverberation and echoes make your sound less clear. Instead of hearing the sound directly from the speaker, you commonly hear about 80 percent from reflection of the room. A line array with little vertical diffusion does not transmit the sound above the speaker, but only where you point it.