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<blockquote data-quote="KARLEON" data-source="post: 464116" data-attributes="member: 541893"><p>D</p><p></p><p>DAC (D/A) Digital to analog converter. A component or circuit that is used to derive or convert an analog signal from a digital one</p><p></p><p>---</p><p></p><p>Damper Part of the suspension connected to the bottom of the cone at the voice coil that centers the voice coil in the air gap. It is sometimes referred to as the spider</p><p></p><p>----</p><p></p><p>Damping The reduction of the magnitude of resonance by the use of some type of material</p><p></p><p>-----</p><p></p><p>Damping Factor 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</p><p></p><p>------</p><p></p><p>DAT Digital Audio Tape</p><p></p><p>-------</p><p></p><p>dB (Decibel) The unit of measurement for sound, using a logarithmic scale. It is an expression of the relative loudness of a sound or power level</p><p></p><p>------</p><p></p><p>dBr A unit of measurement that indicates the decibel level relative to a reference level</p><p></p><p>-------</p><p></p><p>D-Bass Dynamic Bass. Sony's unique low frequency enhancement system which provides up to 18dB of gain to frequencies below 75 Hz, without midrange coloration or interference</p><p></p><p>--------</p><p></p><p>DC Direct Current. A flow of electrons which travels in one direction only</p><p></p><p>--------</p><p></p><p>DC/DC Converter A group of components within an amplifier that converts battery voltage (DC) into AC so that it can be increased by the swetching devices and transformer and converted back to DC (rectified) to provide higher voltage to drive the amplification stage. Also called Power Supply</p><p></p><p>--------</p><p></p><p>Dedicated Fuse A fuse designated to supply power and protection for one particular circuit only</p><p></p><p>----------</p><p></p><p>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)</p><p></p><p>-----------</p><p></p><p>Detachable Face Security A headunit theft-deterrent system in which the front panel is removable, to prevent its loss</p><p></p><p>------------</p><p></p><p>Diaphragm A thin metal or dielectric disk used as the vibrating member in loudspeakers. Also known as a cone</p><p></p><p>-----------------------</p><p></p><p>Difference of Potential The algebraic sum of voltages at two points of different electrical potential.2</p><p></p><p>------------------------</p><p></p><p>Digital Output A signal output connection in digital format using TOSLINK connectors.3</p><p></p><p>------------------------</p><p></p><p>Digital Signal Processing Audio signal manipulation executed entirely in the digital domain.1</p><p></p><p>----------------------</p><p></p><p>DIN Deutsche Industrial Norm. German industrial standardization for radio dimensions, approximately 7 inches wide by 2 inches high.1</p><p></p><p>--------------------</p><p></p><p>Diode A two-electrode (two-terminal) device which allows a voltage/signal to pass through it in one direction only.2</p><p></p><p>----------------------</p><p></p><p>DIN German industrial standards which are used in many European countries. DIN size refers to the stereo size that fits most European cars.2</p><p></p><p>--------------------</p><p></p><p>Direct Load A changer configuration which doesn't use a magazine for the media, instead allowing the insertion of media directly into the unit.1</p><p></p><p>------------------</p><p></p><p>Disarm The opposite of arm, or the term used to describe the action of placing a security system in an inactive or standby mode (Also see Arm).3</p><p></p><p>---------------------</p><p></p><p>Disc Memo A Custom File feature that allows the user to assign an eight character name to a disc. Each CD changer has memory for 110 discs.1</p><p></p><p>--------------------</p><p></p><p>Discharge In a capacitor, the release of stored energy to a load. In a battery, the conversion of chemical energy to electrical energy.4</p><p></p><p>--------------------</p><p></p><p>Discrete Bi-polar Outputs An amplifier output wiring scheme employing separate bi-polar type transistors wired in a darlington configuration, offering higher current gain, lower noise and wider bandwidth.1</p><p></p><p>--------------------</p><p></p><p>Discrete construction Circuit construction where the circuit is made up of actual transistors, resistors, diodes and capacitors instead of Integrated Circiuts.1</p><p></p><p>--------------------</p><p></p><p>Discrete Differential Inputs An amplifier input wiring scheme employing separate components which comprise the differential input circuit.1</p><p></p><p>---------------------</p><p></p><p>Discrete FET Predrive Stage An amplifier wiring scheme employing separate Field Effect Transistors in the pre-drive stage for lower distortion and faster switching.1</p><p></p><p>--------------------</p><p></p><p>Discrete Final Stage An amplifier wiring scheme employing separate components in the output stage.1</p><p></p><p>-------------------</p><p></p><p>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 .4</p><p></p><p>-------------------</p><p></p><p>Distortion Sound which is modified or changed in some way. In a speaker, distortion is produced by several things, most related to poor construction. Voice coil rubbing (caused by being overdriven) is the most common cause of distortion.2</p><p></p><p>--------------------</p><p></p><p>Diversity Tuner An FM tuning method which employs two antennas. The tuner can switch between the two antennas in order to attain better reception.1</p><p></p><p>-----------------------</p><p></p><p>DMM Digital Multimeter. A digital meter that gives a precise reading of voltage, current, or ohms. This type of meter "samples" the input and feeds it to a digital readout.2</p><p></p><p>----------------------</p><p></p><p>Dome Light The common term used to describe the overhead (or headliner) mounted interior courtesy light.2</p><p></p><p>----------------------</p><p></p><p>Door Lock Solenoid The proper name for the electric bi-directional actuator used to provide powered control vehicle door locks. Also called a Door Lock Actuator.2</p><p></p><p>-----------------------</p><p></p><p>Doppler Sensor Another name for a spatial type sensor, also commonly called radar sensors (Also see Spatial Sensors).2</p><p></p><p>----------------------</p><p></p><p>DPDT Double Pole Double Throw. A term used to describe a relay that has two separate poles or contacts and can throw or make electrical contact with two separate stationary contacts.2</p><p></p><p>---------------------------</p><p></p><p>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.1</p><p></p><p>--------------------------</p><p></p><p>Double DIN Twice the height of the standard DIN dimensions.3</p><p></p><p>-------------------------</p><p></p><p>Dress The arrangement of signal leads and wiring for optimum circuit operation, cosmetic appeal, and protective routing.2</p><p></p><p>--------------------------</p><p></p><p>Driver Another term for a loudspeaker. Often used when the loudspeaker is coupled to a horn for acoustic coupling and controlled dispersion of sound.2</p><p></p><p>-------------------------</p><p></p><p>Driver's Remote An ancillary control interface providing intuitive and safe operation of a car stereo.</p><p></p><p>-----------------------</p><p></p><p>DSP Digital Signal Processing (or Processor). A type of processing accomplished by a microcomputer chip specifically designed for signal manipulation, or a component using such processing. The term is often misused as a synonym for ambience synthesizer; however, DSP can do much more than sound field creation.3</p><p></p><p>---------------------</p><p></p><p>DSP Control The ability of a headunit to control an external digital signal processor.1</p><p></p><p>--------------------</p><p></p><p>DSP File A Custom File feature that allows the user to assign a DSP preset to a particular disc, such that when that disc is loaded, the DSP preset is also automatically selected.2</p><p></p><p>--------------------</p><p></p><p>DTMF Dual Tone Multi-Frequency.2</p><p></p><p>-----------------</p><p></p><p>Dual Information Display A step-up featured display configuration that employs two lines of information; e.g. disc/track data, and clock.1</p><p></p><p>--------------------</p><p></p><p>Dual Mode An amplifier configuration in which both a stereo speaker pair and mono speaker system (usually a subwoofer) are simultaneously powered by a stereo amplifier.1</p><p></p><p>--------------------</p><p></p><p>Dual Mono Construction An amplifier construction configuration where virtually two separate single channels amps are used to comprise a stereo amp. Offers superior crosstalk rejection and channel separation.1</p><p></p><p>-------------------</p><p></p><p>Duplexer A cellular device that permits simultaneous reception and transmission of a call.2</p><p></p><p>------------------</p><p></p><p>Dust Cap Part of the speaker that keeps foreign material from falling into the voice coil, which could hinder the speaker's movement and cut short its life.4</p><p></p><p>------------------</p><p></p><p>Duty Cycle An engineering term used to describe the actual time (or frequency) that a circuit or device operates. A pulsing alarm output that is on for seven-tenths of a second and off for three-tenths of a second would have a 70% duty cycle.2</p><p></p><p>------------------</p><p></p><p>Dynamic Range Expressed in decibels, the range of signal amplitudes (from the loudest to the quietest) that can be reproduced effectively by a piece of equipment. With respect to amplifiers, this range is defined by inherent noise at low levels and by overload distortion at high levels. The higher the number the better the performance.4</p><p></p><p>----------------</p><p></p><p>Dynamic Range Suppression 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.1</p></blockquote><p></p>
[QUOTE="KARLEON, post: 464116, member: 541893"] D DAC (D/A) Digital to analog converter. A component or circuit that is used to derive or convert an analog signal from a digital one --- Damper Part of the suspension connected to the bottom of the cone at the voice coil that centers the voice coil in the air gap. It is sometimes referred to as the spider ---- Damping The reduction of the magnitude of resonance by the use of some type of material ----- Damping Factor 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 ------ DAT Digital Audio Tape ------- dB (Decibel) The unit of measurement for sound, using a logarithmic scale. It is an expression of the relative loudness of a sound or power level ------ dBr A unit of measurement that indicates the decibel level relative to a reference level ------- D-Bass Dynamic Bass. Sony's unique low frequency enhancement system which provides up to 18dB of gain to frequencies below 75 Hz, without midrange coloration or interference -------- DC Direct Current. A flow of electrons which travels in one direction only -------- DC/DC Converter A group of components within an amplifier that converts battery voltage (DC) into AC so that it can be increased by the swetching devices and transformer and converted back to DC (rectified) to provide higher voltage to drive the amplification stage. Also called Power Supply -------- Dedicated Fuse A fuse designated to supply power and protection for one particular circuit only ---------- 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) ----------- Detachable Face Security A headunit theft-deterrent system in which the front panel is removable, to prevent its loss ------------ Diaphragm A thin metal or dielectric disk used as the vibrating member in loudspeakers. Also known as a cone ----------------------- Difference of Potential The algebraic sum of voltages at two points of different electrical potential.2 ------------------------ Digital Output A signal output connection in digital format using TOSLINK connectors.3 ------------------------ Digital Signal Processing Audio signal manipulation executed entirely in the digital domain.1 ---------------------- DIN Deutsche Industrial Norm. German industrial standardization for radio dimensions, approximately 7 inches wide by 2 inches high.1 -------------------- Diode A two-electrode (two-terminal) device which allows a voltage/signal to pass through it in one direction only.2 ---------------------- DIN German industrial standards which are used in many European countries. DIN size refers to the stereo size that fits most European cars.2 -------------------- Direct Load A changer configuration which doesn't use a magazine for the media, instead allowing the insertion of media directly into the unit.1 ------------------ Disarm The opposite of arm, or the term used to describe the action of placing a security system in an inactive or standby mode (Also see Arm).3 --------------------- Disc Memo A Custom File feature that allows the user to assign an eight character name to a disc. Each CD changer has memory for 110 discs.1 -------------------- Discharge In a capacitor, the release of stored energy to a load. In a battery, the conversion of chemical energy to electrical energy.4 -------------------- Discrete Bi-polar Outputs An amplifier output wiring scheme employing separate bi-polar type transistors wired in a darlington configuration, offering higher current gain, lower noise and wider bandwidth.1 -------------------- Discrete construction Circuit construction where the circuit is made up of actual transistors, resistors, diodes and capacitors instead of Integrated Circiuts.1 -------------------- Discrete Differential Inputs An amplifier input wiring scheme employing separate components which comprise the differential input circuit.1 --------------------- Discrete FET Predrive Stage An amplifier wiring scheme employing separate Field Effect Transistors in the pre-drive stage for lower distortion and faster switching.1 -------------------- Discrete Final Stage An amplifier wiring scheme employing separate components in the output stage.1 ------------------- 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 .4 ------------------- Distortion Sound which is modified or changed in some way. In a speaker, distortion is produced by several things, most related to poor construction. Voice coil rubbing (caused by being overdriven) is the most common cause of distortion.2 -------------------- Diversity Tuner An FM tuning method which employs two antennas. The tuner can switch between the two antennas in order to attain better reception.1 ----------------------- DMM Digital Multimeter. A digital meter that gives a precise reading of voltage, current, or ohms. This type of meter "samples" the input and feeds it to a digital readout.2 ---------------------- Dome Light The common term used to describe the overhead (or headliner) mounted interior courtesy light.2 ---------------------- Door Lock Solenoid The proper name for the electric bi-directional actuator used to provide powered control vehicle door locks. Also called a Door Lock Actuator.2 ----------------------- Doppler Sensor Another name for a spatial type sensor, also commonly called radar sensors (Also see Spatial Sensors).2 ---------------------- DPDT Double Pole Double Throw. A term used to describe a relay that has two separate poles or contacts and can throw or make electrical contact with two separate stationary contacts.2 --------------------------- 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.1 -------------------------- Double DIN Twice the height of the standard DIN dimensions.3 ------------------------- Dress The arrangement of signal leads and wiring for optimum circuit operation, cosmetic appeal, and protective routing.2 -------------------------- Driver Another term for a loudspeaker. Often used when the loudspeaker is coupled to a horn for acoustic coupling and controlled dispersion of sound.2 ------------------------- Driver's Remote An ancillary control interface providing intuitive and safe operation of a car stereo. ----------------------- DSP Digital Signal Processing (or Processor). A type of processing accomplished by a microcomputer chip specifically designed for signal manipulation, or a component using such processing. The term is often misused as a synonym for ambience synthesizer; however, DSP can do much more than sound field creation.3 --------------------- DSP Control The ability of a headunit to control an external digital signal processor.1 -------------------- DSP File A Custom File feature that allows the user to assign a DSP preset to a particular disc, such that when that disc is loaded, the DSP preset is also automatically selected.2 -------------------- DTMF Dual Tone Multi-Frequency.2 ----------------- Dual Information Display A step-up featured display configuration that employs two lines of information; e.g. disc/track data, and clock.1 -------------------- Dual Mode An amplifier configuration in which both a stereo speaker pair and mono speaker system (usually a subwoofer) are simultaneously powered by a stereo amplifier.1 -------------------- Dual Mono Construction An amplifier construction configuration where virtually two separate single channels amps are used to comprise a stereo amp. Offers superior crosstalk rejection and channel separation.1 ------------------- Duplexer A cellular device that permits simultaneous reception and transmission of a call.2 ------------------ Dust Cap Part of the speaker that keeps foreign material from falling into the voice coil, which could hinder the speaker's movement and cut short its life.4 ------------------ Duty Cycle An engineering term used to describe the actual time (or frequency) that a circuit or device operates. A pulsing alarm output that is on for seven-tenths of a second and off for three-tenths of a second would have a 70% duty cycle.2 ------------------ Dynamic Range Expressed in decibels, the range of signal amplitudes (from the loudest to the quietest) that can be reproduced effectively by a piece of equipment. With respect to amplifiers, this range is defined by inherent noise at low levels and by overload distortion at high levels. The higher the number the better the performance.4 ---------------- Dynamic Range Suppression 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.1 [/QUOTE]
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