A rectangular horn is a type of acoustic device used to direct sound waves. It has a rectangular shape, which helps to control the dispersion of sound in a specific direction. This design is often utilized in various audio applications, including loudspeakers and musical instruments, to enhance sound quality and projection. The rectangular horn operates on the principle of impedance matching, allowing it to efficiently transfer sound energy from a source, such as a driver or microphone, into the surrounding air. By focusing the sound waves, it can produce a clearer and more powerful output compared to other shapes.