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Decade - A measurement equal to the low pass frequency
being
ten times the high pass frequency, which is relavant in a
passive band pass crossover.
The difference between 500 Hz and 5000 Hz is equal to 1 decade.
Decibel (dB) - A unit of measurement for the ratio of loudness.
The threshold of hearing is 0 dB. One dB SPL is the smallest audible difference in sound level.
Detent Controls - A detent knob has precise click-stops at regular points to indicate
how much the control has been turned up or down.
Deutsche Industrie Normen (DIN) - German (European) industrial standards.
DIN size refers to the stereo size that fits most European automobiles.
Dielectric - An insulating material with low electrical conductivity.
Digital Output - An output where the signal is in digital form to allow external
processing before being converted to an analog signal.
Digital Time Delay - A component that electronically delays the audio signals
(in milliseconds) to provide surround type sound as well as compesate for speaker placements.
Digital Time Delay Gain Control - The control that lets you select how much of the
whole of the audio signal to be treated with digital time delay.
Diode - An electrical circuit element that
allows current to flow in one direction.
Direct Current (DC) - An electrical current that flows in one direction.
Directional / Directionality - The angle at which a speaker disperses sound.
Higher frequencies are narrower than lower frequencies. Tweeters are more directional
than woofers.
Dispersion - Distribution of sound from a speaker.
Distortion - Sound that is modified or changed in some way. Measured as a
percentage of the whole signal.
Dolby Noise Reduction - A patented noise reduction system that increases
dynamic range and signal-to-noise ratio of Dolby encoded media.
Dome - A convex speaker shape usually used for tweeters.
Driver - Synonomous with loudspeaker. The term also refers to a loudspeaker
being coupled to a horn for acoustic coupling and controlled dispersion of sound.
Dynamic Range - The difference between the softest and loudest portions
of sound that an amplifier or recorder can reproduce within an acceptable range of distortion.
Expressed in decibels, the higher the number the better.
Dynamic Noise Reduction (DNR) - A signal-processing circuit that reduces
the level of high frequencies (hiss). Unlike Dolby Noise Reduction, DNR does not require
processing during recording.
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