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Decade - A measurement equal to the low pass frequency
being ten times the high pass frequency, which is relevant
in a passive band pass crossover. The difference between 500 Hz
and 5000 Hz is equal to 1 decade. |
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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. |
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Detent Controls - A detent knob has precise click-stops
at regular points to indicate how much the control has been turned
up or down. |
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Deutsche Industrie Normen (DIN) - German (European)
industrial standards. DIN size refers to the stereo size that
fits most European automobiles. |
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Dielectric - An insulating material with low electrical
conductivity. |
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Digital Output - An output where the signal is in digital
form to allow external processing before being converted to an
analog signal. |
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Digital Time Delay - A component that electronically
delays the audio signals (in milliseconds) to provide surround
type sound as well as compensate for speaker placements. |
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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. |
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Diode - An electrical circuit element that allows current
to flow in one direction. |
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Direct Current (DC) - An electrical current that flows
in one direction. |
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Directional / Directionality - The angle at which a
speaker disperses sound. Higher frequencies are narrower than
lower frequencies. Tweeters are more directional than woofers. |
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Dispersion - Distribution of sound from a speaker. |
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Distortion - Sound that is modified or changed in some
way. Measured as a percentage of the whole signal. |
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Dolby Noise Reduction - A patented noise reduction system
that increases dynamic range and signal-to-noise ratio of Dolby
encoded media. |
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Dome - A convex speaker shape usually used for tweeters. |
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Driver - Synonymous with loudspeaker. The term also
refers to a loudspeaker being coupled to a horn for acoustic coupling
and controlled dispersion of sound. |
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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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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. |
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