Loudspeaker

Boom, Boom, Boom

Loudspeakers are also known as ‘speakers’ and they convert and project sound in response to an electric signal.
Loudspeakers are found in most radios, music players and TV receivers, and can be also found in many other electrical devices that produce sound.
In 1861, Johann Philipp Reis put a loudspeaker in his telephone, and in 1876, Alexander Graham Bell gained a patent for a loudspeaker as part of his telephone, and Ernst Siemens, a German, patented an improved loudspeaker in 1877.
Loudspeakers can be either wired using audio cables, or wireless with the speaker transmitting sound via radio signals.
The position of a loudspeaker in a room, as well as the position of the person, the size of the room, and how sound absorbing the room is, all affect the sound quality coming from the speaker.

The most common type of speakers uses a cone that is attached to an electromagnet, which responds to an electrical signal, causing the cone to vibrate and produce sound.
Many different types of loudspeakers have been produced over the years, including horn, electrostatic, magnetostrictive, bending wave, flat panel, plasma arc and digital loudspeakers.
Loudspeakers are usually housed in a type of box, so the sound waves at the back and the sound waves at the front don’t interfere with each other and negatively affect the sound quality.
Loudspeakers often have different drivers to reproduce different frequencies of sound, and these are called ‘woofers’, ‘sub woofers’, ‘tweeters’, ‘supertweeters’ and ‘mid-range speakers’.
Loudspeaker cones or diaphragms are usually made from paper, polypropylene or aluminium, or a combination of these materials.

Amazon: