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Loudspeaker

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What is Loudspeaker?

A loudspeaker is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound.

The most common type of loudspeaker today is the dynamic speaker, invented in 1925 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal.

Smaller loudspeakers are found in everything from radios and televisions to portable audio players, computers and electronic musical instruments. Larger loudspeaker systems are used for music, sound reinforcement in theatres and concerts, and in public address systems.

A loudspeaker, which is also called a speaker, is an item that is used to create the sound in radios, television sets, and electric musical instrument amplifier systems.

 

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How loudspeakers turn electricity into sound?

When things shake about, or vibrate, they make the sounds we can hear in the world around us. Sound is invisible most of the time, but sometimes you can actually see it! If you thump a kettle-drum with a stick, you can see the tight drum skin moving up and down very quickly for some time afterward—pumping sound waves into the air. Loudspeakers work in a similar way.

At the front of a loudspeaker, there is a fabric, plastic, paper, or lightweight metal cone not unlike a drum skin. The outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. The inner part is fixed to an iron coil that sits just in front of a permanent magnet (sometimes called the field magnet). When you hook up the loudspeaker to stereo, electrical signals feed through the speaker cables into the coil. This turns the coil into a temporary magnet or electromagnet. As the electricity flows back and forth in the cables, the electromagnet either attracts or repels the permanent magnet. This moves the coil back and forward, pulling and pushing the loudspeaker cone. Like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.

 

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Side effects of loudspeaker:-

1. Noise pollution affects both health and behaviour. Unwanted sound (noise) can damage psychological health. Noise pollution can cause hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other harmful effects.

2. Sound becomes unwanted when it either interferes with normal activities such as sleeping, conversation, or disrupts or diminishes one's quality of life.

3. Chronic exposure to noise may cause noise-induced hearing loss.

4. Noise can have a detrimental effect on wild animals.

 

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