Megaphones Function: Focusing Sound Waves

Devices such as megaphones, loudhailers, and the design of instruments like the shehnai share a common acoustic purpose.

• Megaphones and loudhailers use a conical or flared opening.
• This shape collects sound waves generated within and directs them outwards.
• The primary goal is to concentrate the sound energy into a specific direction, making it louder for listeners in that path.
• The shehnai also features a bell-shaped end that helps project its sound forward.

Therefore, these devices are engineered to focus sound waves in a particular direction, rather than spreading them equally, converting them to electrical signals, or reducing their intensity.