Do horn speakers sound better? The horn serves to improve the coupling efficiency between the speaker driver and the air. The main advantage of horn loudspeakers is they are more efficient; they can typically produce approximately 3 times (10 dB) more sound power than a cone speaker from a given amplifier output. How does a horn speaker work? 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.