By using a flared transmission channel (a horn) the effective radiating area of the source of sound can be increased to that of the mouth, thus creating greater air coupling (louder sound). Because of the gradual change of the diameter of a horn, the source of sound at the throat engages all the air in a horn.

What is a PA in sound?

A public address (PA) system is for amplifying the human voice. In its simplest form, it has a microphone, mixer, and loudspeakers. It all starts with the microphone (mic), which converts sound pressure to voltage.

Why do horn speakers sound better?

Horn speakers are a very efficient design because the diaphragm doesn’t have to oscillate very much in order to create a loud sound compared to say, a cone diaphragm. … Instead of dispersing sound all over the room, the sound can be aimed directly at the listener.