Megaphone
It was invented in 1915, and since then, generations of technicians have made unremitting efforts to improve it. To this day, many domestic electroacoustic industry manufacturers have developed portable megaphones, which are mainly used for teaching, tour guides, and outdoor activities. Compared with handheld microphones, the biggest advantage is that users free their hands.
Loudspeaker
Also known as "speaker". It is a very commonly used electroacoustic transducer device, which can be seen in electronic circuits that make sounds. The speaker is the weakest device among electronic components, but it is the most important device for sound effects.
In fact, to put it bluntly, a megaphone is a microphone with sound. A loudspeaker is a speaker.
