Line array speakers are nifty. You take a whole bunch of speaker drivers, and you put them in a vertical line, and then wire them in series/parallel with each other so they look like one speaker (at, say, 8 ohms) to the amplifier. Since the load is shared between so many drivers they have a great dynamic range because each driver is doing less work and operating more efficiently.

The downside is that with so many drivers working at once each is a point source; the sound waves eminating from each speaker can cancel each other out, especially at higher frequencies. Naturally there's a long list of design tradeoffs you can use to mitigate this; speaker design is a complicated art.