Leach, W. Marshall, Jr. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia.
Last reviewed:January 2020
- Dynamic drivers
- Small-signal parameters
- Driver sensitivity
- Closed-box systems
- Vented-box systems
- Passive-radiator systems
- Band-pass systems
- Horn-loaded drivers
- Related Primary Literature
- Additional Reading
A device that converts an electrical signal from an amplifier into sound. A loudspeaker driver is an electromechanical-acoustic device with two electrical input terminals, to which an electrical signal is applied, and a diaphragm which vibrates and radiates sound. An electromechanical motor mechanism exerts a force on the diaphragm to cause it to vibrate. By far the most common type of motor mechanism, the electromagnetic-mechanical transducer, employs a coil of wire immersed in a magnetic field; electric current flowing through the coil causes a force to be exerted on the coil which is mechanically coupled to the diaphragm. A less common type of motor mechanism is the electrostatic-mechanical transducer. It uses a capacitor to which an electric voltage is applied, causing a force to be exerted between the capacitor plates, which is mechanically coupled to the diaphragm. Two types of electrostatic transducers are used: the piezoelectric transducer and the condenser transducer. The piezoelectric transducer uses a piezoelectric crystal between the capacitor plates. The condenser transducer uses an air dielectric. One plate of the capacitor is a flexible membrane which serves as the diaphragm. See also: Audio amplifier
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