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About a Speaker: A speaker has the job of converting the electrical signal from an amplifier, into physical air movement or vibration, which is what we hear as sound. To enable it to do this, the electrical part of the speaker consists of a coil surrounding a magnet. When the electrical signal passes through the coil it creates an elctrical field which, because of the magnet, causes it to move. The physical air movement is created by a diaphragm (or cone) which is attached to the coil, so that this also moves as the signal changes. The movement of the diaphragm causes air movement, and hence creating audible sound. In order to physically move the diaphragm, a significant amount of power needs to be delivered to the coil and therefore, the speaker is vulnerable to coil damage if driven beyond its design capacity. Overdriving a speaker can result in the coil either burning out, causing total failure, or becoming distorted by heat which results in an impaired signal due to physical contact between the coil and the magnet - often resulting in a "scratchy" sound.