Compression drivers are used for the highest efficiency of loudspeaker sound that is backed up with intense power. Using a diaphragm and voice coil, and often an acoustical horn, a compression driver uses high frequency sound reproduction that allows clear and accurate sound at high volumes.
Definition
A compression driver is a loudspeaker driver that uses compression of a diaphragm larger than the opening through which the sound is emitted, allowing it to reach high efficiencies. These drivers are generally used in reinforcement loudspeakers with high power sound because of their high frequency reproduction. The purpose of a compression driver is to help achieve a clear and accurate sound at high levels of volume.
Assembly
The diaphragms in compression drivers are domes that curve to the inside are made with beryllium, titanium or aluminum and range in size from 2 to 4 inches in diameter, depending on the quality of power needed. Larger diaphragms make for a better acoustical output than smaller diaphragms because they create lower distortion, and allow a sound to come out more clearly. A voice coil is attached to the border of the diaphragm which gets rid of waste heat for maximum efficiency of the sound.
Lifespan
Because a compression driver is made of pieces of metal that must vibrate rapidly with excessive power, it wears out fairly quickly. A driver with a good design that has been taken care of may need to be replaced within four to five years of its installation. Other designs may need to be replaced within a year.
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