A horn loudspeaker is a speaker which uses an acoustic horn to increase the overall efficiency of the driving element. The horn serves to improve the coupling efficiency between the speaker driver and the air. The horn can be thought of as an “acoustic transformer” that provides impedance matching between the relatively dense diaphragm material…

The principle of sound amplification by horns has been used by people in pre-historical times. Already the first civilizations knew how to use the physical properties of a hollow animal horn to amplify sound. Like everything, we have learned this principle from nature, and the expanding baffle is used in many musical instruments. The physics…