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But, How Do They Work? Speakers come in all shapes and sizes, enabling you to listen to music on your iPod, enjoy a film at the cinema or hear a friend’s voice over the phone. In order to translate an electrical signal into an audible sound, speakers contain an electromagnet: a metal coil which creates a magnetic field when an electric current flows through it. This coil behaves much like a normal magnet, with one particularly handy --Please Scroll Down to See More!-- property: reversing the direction of the current in the coil flips the poles of the magnet. Inside a speaker, an electromagnet is placed in front of a permanent magnet. The permanent magnet is fixed firmly into position whereas the electromagnet is mobile. As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth. The electromagnet is attached to a cone made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears. The frequency of the vibrations governs the pitch of the sound produced, and their amplitude affects the volume – turn your stereo up high enough and you might even be able to see the diaphragm covering the cone move. To reproduce all the different frequencies of sound in a piece of music faithfully, top quality speakers typically use different sized cones dedicated to high, medium and low frequencies. A microphone uses the same mechanism as a speaker in reverse to convert sound into an electrical signal. In fact, you can even use a pair of headphones as a microphone!
Intro Speakers are actually relatively simple devices. You should understand at least the basics of how speakers work before incorporating them into your home theater system. Basically, you have a box into which speaker drivers are attached. The drivers are the round elements that many people call the speakers, however they are wrong. Speaker drivers look like cones or horns (or even ribbons or domes), and --Please Scroll Down to See More!-- in fact, the large surface area of the drivers is called the cone or diaphragm. These surfaces move back and forth to make the sound. If you have ever pulled the front screen off your speakers or have seen speakers without their front on, you’ve seen speaker drivers in their natural state.
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The picture to the left shows a popular brand of speakers. These speakers are usually more expensive than the average speaker because of the better features and quality of sound.
The picture above shows a simple yet powerful speaker being used for various activities : playing sounds of the computer, listening to an ipod, or maybe even watching tv.
Image from: foreverdigital
Image from: reemixx
