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Speakers Glossary
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Used in an audio context, it is a method of representing and storing audio information with numbers, generally ones and zeros. At some point in the system, the digital signal has to be changed to an analog electrical signal in order to be played through loudspeakers, headphones etc. See Analog.

Decibel (dB)
A logarithmic scale used to denote a change in the relative strength of an electric signal or acoustic wave measured in dB. An increase of 10dB will sound twice as loud as the original sound. 0 dB represents the threshold of normal human hearing.

The part of a dynamic loudspeaker attached to the voice coil that moves and produces the sound. It is usually cone or dome shaped.

The scattering of sound waves. Diffusion reduces the sense of direction of a sound source, a useful quality in surround speakers.

Direct Current (DC)
Current that occurs in one direction only.

A change in the direction of a wave that is caused by the wave moving past or hitting an obstacle.

The gradual spreading of sound waves as it leaves a speaker.

Any undesirable change in the reproduction of sound that alters the original signal.

Dome Tweeter
A high frequency speaker with a dome-shaped diaphragm.

A loudspeaker unit that consists of the electromagnetic components of a speaker, typically a magnet and voice coil.

Dynamic range
The range of sound intensity that a system can reproduce without compressing or distorting the signal.