Another advantage of line array systems isn't only their wide horizontal pattern, but also the narrow vertical pattern.
The combination of those attributes are what allow the sound dispersion to fall off more gradually with distance. That's how you can effectively stand in front of your speaker and still have it project around a small/medium sized room without being deafened.
A horn needs to be physically quite large to provide a similar projection, otherwise it has similar properties to a conventional speaker with only a benefit to horizontal coverage.
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