One of the wonderful innovations by humans is the (loud)speaker. The (loud)speaker converts electrical signal or energy to the appropriate sound signal after the microphone or any other media has converted the original sound energy to electrical signal.
The sound produced by (loud)speakers are a lot louder than the original sound input, this is due to an equipment called the amplifier.
The loudspeaker meets the need of almost every human, as it allows everybody in a large congregation to hear effectively and clearly the original sound produce by a speaking individual or a media device. Sound signal is wave-like and requires no material medium ( empty space ) to propagate. Sound energy is converted to it equivalent electrical signal for ease of amplification and other fine tuning. Sound/Audio Engineering is an interesting field that deals with the transmission, compression, amplification, conversion, noise reduction, reinforcement,.... of sound using different equipment.
Loudspeakers disseminates whatever is transmitted to them, and the loudspeaker's opinion is this "he that has ears, let him hear".
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