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1. D'Appolito:-Joe D'Appolito is credited with popularizing the MTM (Midrange-Tweeter-Midrange) type of speaker.
Submitted on Wednesday, January 28, 2009 5:48:41 PM

2. DAC:
A Digital to Audio Converter. Converts a digital bitstream to an analog signal. Can be a separate "box" that connects between a CD Transport or CD Player and a pre-amplifier.
Submitted on Monday, December 27, 2010 5:48:41 PM

3. DAC
Definition:Digital to analog converter. An IC component or circuit that is used to derive or convert an analog signal from a digital one.
Submitted on Monday, October 27, 2008 5:48:41 PM

4. Damper:
Part of the suspension connected to the bottom of the speaker cone at the voice coil that centers the voice coil in the magnetic gap. It is sometimes referred to as the spider
Submitted on Saturday, January 24, 2009 5:48:41 PM

5. Damping
Definition:As Newton observed, an object once set in ,motion will keep on moving unless a restrictive counterforce is applied. Damping is that force at work in the mechanical resistance that is applied to a speaker cone to keep it from resonating in the absence of an input signal. It is also the factor that is applied as a control voltage by the amplifier for the same purpose. These measures help reduce or dampen Harmonic Distortion. This also improves bass accuracy.
Submitted on Sunday, September 14, 2008 5:48:41 PM

6. Damping-The process of reducing or eliminating vibrations, reverberations and/or oscillations. (e.g., In car audio often add a heavy, sticky damping material to any panels that tend to resonate and rattle.)
Submitted on Saturday, October 02, 2010 5:48:41 PM

7. Damping-The process of reducing or eliminating vibrations, reverberations and/or oscillations. (e.g., In car audio often add a heavy, sticky damping material to any panels that tend to resonate and rattle.)
Submitted on Monday, September 22, 2008 5:48:41 PM

8. Damping (Damping factor, etc.)
Definition:Refers to the ability of an audio component to "stop" after the signal ends. For example, if a drum is struck with a mallet, the sound will reach a peak level and then decay in a certain amount of time to no sound. An audio component that allows the decay to drag on too long has poor damping, and less definition than it should. An audio component that is overdamped does not allow the initial energy to reach the full peak and cuts the decay short. "Boomy" or "muddy" sound is often the result of underdamped systems. "Dry" or "lifeless" sound may be the result of an overdamped system.
Submitted on Monday, July 26, 2010 5:48:41 PM

9. Damping Factor
Definition:The ratio of rated load impedance to the internal impedance of an amplifier. The higher the value, the more efficiently an amplifier can control unwanted movement of the speaker coil. A high damping factor is crucial for large speakers that reproduce bass. Usually the higher the number, the better, although it is debatable if anything over 50 is audible. Damping factor is calculated by dividing the load (speaker) impedance by the output impedance of the amplifier. Thus, a given amplifier's damping factor will decrease as the speaker's impedance decreases. This means an amp optimized at 4 ohms will provide tighter bass than at 2 ohms.
Submitted on Thursday, May 06, 2010 5:48:41 PM

10. dB is for decibel
a measurement of power ratios and volume. All you really need to know is that to gain 3dB in volume (just enough to hear the difference), you must double your power. There. That's it.
Submitted on Friday, July 09, 2010 5:48:41 PM

11. DC:-Direct Current.
Submitted on Monday, May 11, 2009 5:48:41 PM

12. DC is direct current
Definition:a type of circuit. In a DC circuit, the current always flows in one direction. In your car, you're dealing with a 12volt DC system (twelve volts of direct current). Hence the term, "12volt Guys." In a car, it's important to keep track of which wires are attached to the ground (or "negative") lead of the battery.
Submitted on Wednesday, August 06, 2008 5:48:41 PM

13. DC/DC Converter:-Since 12 volts limits the amplitude of an audio signal, a group of components within an amplifier converts battery voltage (DC) into AC so that it can be increased by swetching devices and a transformer, and converted back to DC (rectified). This provides higher voltage to drive the amplification stage to higher power. Also called the Power Supply circuit.
Submitted on Sunday, March 29, 2009 5:48:41 PM

14. DCC and MD
Definition:Two additional formats for recorded material that stand for Digital Compact Cassette and MiniDisc, respectively. (e.g., Although it is rare to see DCC units in a car audio system, more and more MD players are being sold every day.)
Submitted on Wednesday, April 14, 2010 5:48:41 PM

15. DCC and MD:Two additional formats for recorded material that stand for Digital Compact Cassette and MiniDisc, respectively. (e.g., Although it is rare to see DCC units in a car audio system, more and more MD players are being sold every day.)
Submitted on Monday, December 28, 2009 5:48:41 PM

16. Decay
The time of reduction of the level of a signal immediately after its cessation .
Submitted on Friday, February 05, 2010 5:48:41 PM

17. Decibel (dB):-Named after Alexander Graham Bell. We perceive differences in volume level in a logarithmic manner. Our ears become less sensitive to sound as its intensity increases. Decibels are a logarithmic scale of relative loudness. A difference of approx. 1 dB is the minimum perceptible change in volume, 3 dB is a moderate change in volume, and about 10 dB is an apparent doubling of volume 0 dB is the threshold of hearing, 130 dB is the threshold of pain.
Submitted on Thursday, November 18, 2010 5:48:41 PM

18. Decibel or dB:One tenth of a Bel. This is a measurement of the comparative strength of two powers, and can be applied when measuring any signal in the audio, video, and electromagnetic spectrum. If two powers differ by one Bel, there is a difference of 10 times the power. If comparing amplifiers, where one is rated at 10 watts while the other is 100 watts, then we have a difference of 10 decibels, or one Bel. Decibels should be understood as ratios, not fixed quantities. Decibels are the preferred method and term for representing the ratio of different audio levels. It is a mathematical shorthand that uses logarithms (a shortcut using the powers of 10 to represent the actual number) to reduce the size of the number. For example, instead of saying the dynamic range is 32,000 to 1, we say it is 90 dB [the answer in dB equals 20 log x/y, where x and y are the different signal levels]. Being a ratio, decibels have no units. Audiologists generally assert that 1 decibel is the smallest difference in volume that can be heard by the average person. The term is derived as an honor to Alexander Graham Bell, who invented the telephone, and did much of the preliminary work in the modern science of acoustics.
Submitted on Tuesday, January 19, 2010 5:48:41 PM

19. Delay
Definition:A signal processing device or circuit used to delay one or more of the output signals by a controllable amount. This feature is used to correct for loudspeaker drivers that are mounted such that their points of apparent sound origin (not necessarily their voice coils) are not physically aligned. Good delay circuits are frequency independent, meaning the specified delay is equal for all audio frequencies (constant group delay). Delay circuits based on digital sampling techniques are inherently frequency independent and thus preferred.
Submitted on Monday, August 16, 2010 5:48:41 PM

20. Delaying-Adjusting the passage of time between two signals. (e.g., If I purchase a DSP system, I can delay one channel of my stereo, and move the images across the soundstage.)
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21. Delaying:-Adjusting the passage of time between two signals. (e.g., If I purchase a DSP system, I can delay one channel of my stereo, and move the images across the soundstage.)
Submitted on Monday, July 05, 2010 5:48:41 PM

22. Destructive Interference
A phenomenon that occurs when speakers are 180 degrees out of phase, i.e., what one speaker is trying to produce, the other speaker is fighting to cancel. One speaker's wave is in the positive phase (rarefaction), while the other speaker's wave is in the negative phase (compression).
Submitted on Sunday, October 25, 2009 5:48:41 PM

23. Detachable Face-Occasionally referred to as 'Removable Panel' or 'Theft Deterrent Faceplate', or some variation. This is a physical method for foiling receiver thieves. The idea is that you take just the front panel with the controls with you when you leave the car. A thief cannot buy a new face for a unit unless he has a receipt for it. Some manufacturers makes sets with rotating faces called Mask.
Submitted on Tuesday, July 13, 2010 5:48:41 PM

24. Diaphragm:
This term describes the sound-producing element in a tweeter, or Horn. This is the surface that produces the sound you actually hear. The motor that drives it can be any of several technologies including Piezo, conventional dynamic, or ribbon types. Diaphragms do not produce low and low midrange frequencies well, so they are not usually found in that application.
Submitted on Tuesday, November 25, 2008 5:48:41 PM

25. Diaphragm:
The part of a dynamic loudspeaker attached to the voice coil that moves and produces the sound. It usually has the shape of a cone or dome.
Submitted on Thursday, May 28, 2009 5:48:41 PM

26. Die Cast:-A type of speaker basket or frame that is cast as a single piece of relatively thick, rigid metal. This contrasts with a Stamped frame that is shaped by pressure, much like a car body fender. Cast metal is heavier and more rigid, and thus less likely to "ring" at certain frequencies, and will hold its shape somewhat longer against the pull of gravity. This is mainly advantageous in the larger woofers of 12" or greater. Smaller drivers will likely not benefit perceptibly from being cast.
Submitted on Saturday, August 01, 2009 5:48:41 PM

27. Diffraction:-A change in the direction of a wave front that is caused by the wave moving past an obstacle.
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28. Diffraction
Definition:a change in the direction and velocity of a wave front that is caused by the wave moving past an obstacle.
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29. Diffuse:-Widely spread out or scattered; not concentrated.
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30. Diffuser:
A commercial device like a lens or grillwork that diffuses, or scatters sound
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31. Digital Amplifiers:See article on "amplifier classes"
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32. Digital Technology
Human beings directly process information in an analog format. That is, our senses directly convey information to the brain in the form of constantly varying amplitudes and frequencies that approximate the impact of outside stimuli upon the receptors (eyes and ears, etc.) of the organs involved.
Submitted on Saturday, June 07, 2008 5:48:41 PM

33. DIN:-The initials stand for German Industrial Standard and in car audio can be used to describe a standard dash opening for a deck or a multi-pin connector used in lieu of a RCA connector. (e.g., Years ago most German car audio decks used DIN connectors on the signal path.)
Submitted on Friday, December 11, 2009 5:48:41 PM

34. DIN:Acronym for Deutsche Industrie Norm (Deutsches Institut fuer Normung), the German standardization body. A world reference standard for the mounting parameters of many common receivers ( Head ends) as well as other types of cables and equipment. Single DIN is the standard face size for receivers, and measures 7-3/8"wide by 2-1/4" high. DIN+1/2 measures 7-3/8"wide by 3-3/8"high. Double DIN measures 7-3/8"wide by 4-1/2" high.
Submitted on Tuesday, February 10, 2009 5:48:41 PM

35. DIN:
The initials stand for German Industrial Standard and in car audio can be used to describe a standard dash opening for a deck or a multi-pin connector used in lieu of a RCA connector. (e.g., Years ago most German car audio decks used DIN connectors on the signal path.)
Submitted on Tuesday, December 16, 2008 5:48:41 PM

36. Dipole:An open-back speaker that radiates sound equally front and rear. The front and rear waves are out of phase and cancellation will occur when the wavelengths are long enough to "wrap around". The answer is a large, wide baffle or to enclose the driver creating a monopole.
Submitted on Monday, December 07, 2009 5:48:41 PM

37. Direct Current (DC)-Current that moves in only one direction.
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38. Direct sound
Definition:Sound that arrives at the listeners ear first.. Sound reaching the listening location without reflections, i.e., sound that travels in the most direct path from the source to the listener.
Submitted on Sunday, January 18, 2009 5:48:41 PM

39. Discrete Output Devices
A separate active unit in an amplifier, capable of performing a single essential function within the output circuit. There are three basic types of output devices found on car audio amplifiers — integrated circuits, bipolar transistors, or MOSFETs. Integrated Circuits (or IC)are found only on relatively low-wattage (20 watts RMS per channel or less) amplifiers and receivers. An IC incorporates many functional devices and thus is not considered a discrete output device. Most cannot handle more than 25 watts RMS.
Submitted on Tuesday, October 06, 2009 5:48:41 PM

40. Dispersion:
The spreading of sound waves as they leave a source. The spreading of sound waves as they leave a source.
Submitted on Tuesday, November 16, 2010 5:48:41 PM

41. Dispersion:
The extent to which a sound emitter yields acoustic radiation over a given area. This is a particular concern in tweeters and midranges whose portion of the audio spectrum has a much more directional character than woofers. Many Horn tweeters, while very energetic, have a more limited area of dispersion within which their effect can be fully perceived. Generally, Dome tweeters can be heard over a much wider area, all other factors being equal. But each particular example must be assessed individually for this factor. Some radiator designs are better than others.
Submitted on Friday, August 22, 2008 5:48:41 PM

42. Displacement:-The measurement of cubic volume that an item (such as a speaker or port) takes away from the internal volume of an enclosure. When designing an enclosure, this figure must be added to the enclosure volume .
Submitted on Saturday, October 25, 2008 5:48:41 PM

43. Distortion:-Any departure from a true and accurate reproduction of the original waveform. It can include Noise, Clipping Distortion, Harmonic, and Intermodulation Distortion. These last two forms are fairly common in loudspeaker reproduction and can be reduced but not entirely eliminated in the existing technology. It would be fair to say that modern amplifier design fairly eliminates nearly all forms of inherent perceived distortion, leaving only that caused by inappropriate user settings and overloading. Distortion is the name given to anything that alters a pure input signal in any way other than changing its size. The most common forms of distortion are unwanted components or artifacts added to the original signal, including random and hum-related noise. Distortion measures a system's linearity - or nonlinearity. Anything unwanted added to the input signal changes its shape (skews, flattens, spikes, alters symmetry or asymmetry). A spectral analysis of the output shows these unwanted components. If a circuit is perfect, it does not add distortion of any kind. The spectrum of the output shows only the original signal - nothing else - no added components, no added noise - nothing but the original signal. It's rather amusing to see amplifier manufacturers making great claims about the advantage of the extra .001 % Distortion they've wrung out of their products, while most speakers are considered very good if they can keep such distortions below 5 %. It's true that the reduction of any distortion anywhere is a positive contribution to the goal of high fidelity, but the disparity between the two technologies in this regard points up the largely subjective nature of many such claimed advantages.
Submitted on Tuesday, May 25, 2010 5:48:41 PM

44. Distortion:
Undesirable alteration in a signal. (e.g., Roy's cheapie electronic crossover added so much distortion to the signal that we couldn't even tell what we were playing.)
Submitted on Thursday, August 20, 2009 5:48:41 PM

45. Distortion:Anything that alters the musical signal. There are many forms of distortion, some of which are more audible than others. Distortion specs are often given for electronic equipment which are quite meaningless. As in all specifications, unless you have a thorough understanding of the whole situation, you will not be able to make conclusions about the sonic consequences.
Submitted on Monday, April 12, 2010 5:48:41 PM

46. Distortion-Undesirable alteration in a signal. (e.g., Roy's cheapie electronic crossover added so much distortion to the signal that we couldn't even tell what we were playing.)
Submitted on Thursday, July 31, 2008 5:48:41 PM

47. Diversity Tuner
An FM tuning method which employs two antennas. The tuner can switch between the two antennas in order to attain better reception.
Submitted on Tuesday, April 15, 2008 5:48:41 PM

48. DIY
Definition:Abbreviation for Do - It - Yourself. In audio, the most common DIY is building speakers but some hobbyists build everything from pre-amps to amplifiers to DACs.
Submitted on Saturday, May 29, 2010 5:48:41 PM

49. Dolby-The most common shared logo or feature between all brands is the Dolby labs' 'double D' symbol. Named after audio engineer, Ray Dolby, it represents a number of sound processing technologies that are incorp-orated in a diverse number of products since the early 1970's.
Submitted on Friday, March 06, 2009 5:48:41 PM

50. Dolby Digital:Is a five-channel system consisting of left, center, right and left rear, right rear channels. All processing is done in the digital domain. Unlike Dolby Prologic in which the rear effects channels are frequency limited to approx. 100-7000Hz, Dolby Digital rear channels are specified to contain the full 20-20Khz frequency content. The AC3 standard also has a separate subwoofer channel for the lowest frequencies.
Submitted on Wednesday, May 07, 2008 5:48:41 PM

51. Dolby Digital:
Dolby's name for its format for the digital soundtrack system for motion picture playback. Utilizes their AC-3 method of digital compression. The signal is optically printed between the sprocket holes. Introduced to Home Theater on laser disc and DVD and CD. Dolby Digital may use any number of primary audio delivery and reproduction channels, from 1 to 5, and may include a separate bass-only effects channel. The designation "5.1" describes the complete channel format. Surround decoder systems with Dolby Digital automatically contain Dolby Pro Logic processing to ensure full compatibility with the many existing program soundtracks made with Dolby Surround encoding.
Submitted on Wednesday, December 08, 2010 5:48:41 PM

52. Dolby Digital EX Surround
Also referred to as Dolby Digital 6.1, adds a rear, center channel to the existing left, center, right and rear speakers. This format requires a 6.1 processor or receiver and DVDs that are 6.1 encoded.
Submitted on Monday, March 02, 2009 5:48:41 PM

53. Dolby Noise Reduction:
Decodes Dolby-encoded cassette tapes during playback to virtually eliminate the tape hiss which is especially apparent in quiet environments. Dolby B is the most widely used system. Dolby C is an extension that is even more effective at increasing the signal-to-noise ratio.
Submitted on Thursday, April 22, 2010 5:48:41 PM

54. Dolby Prologic
Is a four-channel system consisting of left, center, right and rear channel, (the single rear channel is usually played through two speakers).
Submitted on Wednesday, May 05, 2010 5:48:41 PM

55. Dome Tweeter:A high frequency speaker with a dome-shaped diaphragm.A high frequency speaker with a dome-shaped diaphragm.
Submitted on Friday, April 25, 2008 5:48:41 PM

56. Dome Tweeter-Tweeters come in several different types; cones, horns and domes being the most popular. Dome types are heavily favored in many standard applications. They are efficient, and have low Distortion and wide dispersion. There is a choice between hard and soft dome materials, but all have relatively low mass and high power handling capabilities. This same design in a larger form is quite effective as a midrange Driver also, and for many of the same reasons.
Submitted on Friday, June 05, 2009 5:48:41 PM

57. Dot Matrix Display-A display type that employs regularly spaced patterned grids of point-source lighting elements. As a result, characters displayed have greater resolution than a segmented display.
Submitted on Sunday, December 06, 2009 5:48:41 PM

58. Double (Dual) Voice Coil (DVC)
Definition:A voice coil with two windings, generally used in woofers. Each voice coil can be connected to a stereo channel, or both voice coils can be wired in parallel or series to a single channel.
Submitted on Monday, February 08, 2010 5:48:41 PM

59. Double Stacked (magnet):
Two magnets overlaying each other to increase the overall magnetic field. In some designs for home theater applications the polarity is reversed which provides the effect of "shielding,"inhibiting the size of the magnetic field radiation, thus allowing the speakers to be used next to a television without creating Distortions on the picture tube. This is achieved without a detrimental effect on the normal power handling capabilities of the speaker.
Submitted on Friday, December 12, 2008 5:48:41 PM

60. Dress:-The arrangement of signal leads and wiring for optimum circuit operation, cosmetic appeal, and protective routing.
Submitted on Sunday, December 05, 2010 5:48:41 PM

61. Driver-Just another word for a speaker. (e.g., When two 4-ohm drivers are wired in parallel, then that presents a 2-ohm load to the amplifier.)
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62. Driver-An alternate term for
Submitted on Sunday, November 15, 2009 5:48:41 PM

63. Driver
Just another word for a speaker. (e.g., When two 4-ohm drivers are wired in parallel, then that presents a 2-ohm load to the amplifier.)
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64. Driver Volume
Definition:The amount of enclosure airspace that is displaced by the speaker itself.
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65. DSP-Digital Signal Processing. DSP can be used to create equalization, compression, etc. of a digital signal.
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66. DSP (digital signal processing)
A technology for signal processing that combines algorithms and fast number-crunching digital hardware, and is capable of high-performance and flexibility.
Submitted on Friday, October 23, 2009 5:48:41 PM

67. DTS-Digital Theater System. A multi-channel encoding/decoding system. Used in some movie theaters. Also now included in some home-theater processors. A competitor to Dolby Digital.
Submitted on Friday, August 28, 2009 5:48:41 PM

68. Dual Voice Coil:A woofer with two voice coils mounted to a common cone, which can be connected to separate amplifiers, to produce a common bass output. Since bass has a non-directional character, this still permits the optimum reproduction of the stereo image via other speakers. Care should be taken in making connection, to observe proper polarities, however. Failure to do so can result in the quick extinction of the Driver if the amplifiers are pulling the cone in different directions at once.
Submitted on Wednesday, August 18, 2010 5:48:41 PM

69. Dual-Cone:Many factory installed auto speakers are of the dual cone type. Sometimes also referred to as a "full-range" speaker, it uses an inexpensive, efficient design. The small "whizzer" cone in the center of the woofer reproduces high frequencies, but not with the dispersion, range, or intensity of a separate tweeter.
Submitted on Thursday, July 16, 2009 5:48:41 PM

70. Dual-Voice Coil:-A particular speaker design that uses separate voice coils connected to the same speaker cone. (e.g., Manny used a dual-voice coil woofer so that he could operate his amplifier in stereo rather than mono.)
Submitted on Wednesday, November 05, 2008 5:48:41 PM

71. Dual-Voice Coil
A particular speaker design that uses separate voice coils connected to the same speaker cone. (e.g., Manny used a dual-voice coil woofer so that he could operate his amplifier in stereo rather than mono.)
Submitted on Friday, April 16, 2010 5:48:41 PM

72. Dub:A copy or the process of making a copy of a recording on another storage device.
Submitted on Friday, August 29, 2008 5:48:41 PM

73. Dust Cover/Cap-A rigid cardboard or plastic dome placed over the opening to the voice coil cylinder in a dynamic cone driver. The main purpose is to prevent dust from falling into the voice coil-magnet gap and causing problems. In some units it may have a slight ancillary function in extending - slightly - the midrange/ high response. Occasionally the dome may be inverted in such a manner as to extend the inner surface of the woofer and provide a very slight improvement in the smoothness of low frequency to midrange roll-off.
Submitted on Monday, June 09, 2008 5:48:41 PM

74. DVD:
Digital Video Disc or Digital Versatile Disc. A relatively new standard that seeks to combine better-than-laser-disc quality video with better-than-CD quality audio in a disc the size of a CD. Requires special players. Seems to be a viable candidate to replace both Laser Discs and CDs, but the jury is still out.
Submitted on Tuesday, August 12, 2008 5:48:41 PM

75. Dynamic Headroom:
The ability of an audio device to respond to musical peaks. For example, an amplifier may only be capable of a sustained 100 watts, but may be able to achieve peaks of 200 watts for the fraction of a second required for an intense, quick sound. In this example the dynamic headroom would equal 3 db.
Submitted on Friday, December 03, 2010 5:48:41 PM

76. Dynamic Range-The difference between the maximum signal level and the noise floor. (e.g., Modern CDs are capable of more than 90 dB of dynamic range, which is about twice as much as with old cassette tapes without noise reduction.)
Submitted on Sunday, February 28, 2010 5:48:41 PM

77. Dynamic Range:
The difference between the maximum signal level and the noise floor. (e.g., Modern CDs are capable of more than 90 dB of dynamic range, which is about twice as much as with old cassette tapes without noise reduction.)
Submitted on Thursday, October 21, 2010 5:48:41 PM

78. Dynamic range-The ratio of the loudest (undistorted) signal to that of the quietest (discernible) signal in a unit or system as expressed in decibels (dB). Dynamic range is another way of stating the maximum S/N ratio. With reference to signal processing equipment, the maximum output signal is restricted by the size of the power supplies, i.e., it cannot swing more voltage than is available. While the minimum output signal is determined by the noise floor of the unit, i.e., it cannot put out a discernible signal smaller than the noise. Professional-grade analog signal processing equipment can output maximum levels of +26 dBu, with the best noise floors being down around -94 dBu. This gives a maximum dynamic range of 120 dB - pretty impressive numbers, which coincide nicely with the 120 dB dynamic range of normal human hearing (from just audible to uncomfortably loud).
Submitted on Tuesday, August 10, 2010 5:48:41 PM

79. Dynamic range
The range between the loudest and the softest sounds that are in a piece of music, or that can be reproduced by a piece of audio equipment without distortion (a ratio expressed in decibels). In speech, the range rarely exceeds 40 dB; in music, it is greatest in orchestral works, where the range may be as much as 75 dB.
Submitted on Sunday, April 25, 2010 5:48:41 PM

80. Dynamic Range Suppression
Definition:A signal compression technique which raises the level of lower passages without affecting overall volume. Especially useful with high noise levels, such as a moving vehicle.
Submitted on Thursday, June 03, 2010 5:48:41 PM

81. Dynamics-When used in music, refers to the varying degree of loudness and softness in a musical performance.
Submitted on Wednesday, March 11, 2009 5:48:41 PM

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