Car Audio Terms defined

[KARLEON 10+ year member]

P

Pager A device designed to transmit a signal to the owner of a vehicle in order to alert them when the alarm has been triggered.2

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Pain Generator(s) A name given to a type of siren that is specifically designed to produce a sound of the proper volume and pitch so as to cause physical pain to a thief's ears.2

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Panic The name given to the feature of a security system that provides the ability for the operator to cause the system's siren to sound at will. The panic feature is typically initiated either by pressing a button or buttons on the remote control transmitteror by keypad command or by push-button or toggle switch.2

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Parallel Wiring A circuit in which two or more devices are connected to the same source of voltage, sharing a common positive and negative point, so that each device receives the full applied voltage.2

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Parametric EQ An equalizer with adjustable frequency, level and "Q"1

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Passive Arming The ability of some security systems to arm without requiring any direct action from the operator of the vehicle. Passive arming is usually accomplished when the operator exits the vehicle in the normal fashion (Also see Last Door Arming).2

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Passive Component In a crossover system, a non-powered component used to separate an audio signal into a specified frequency band before it goes to a particular amplifier or driver. A passive device usually presents some loss (expressed in decibels) to a system.4

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Passive Repeater Antenna A non-permanently installed, glass-mount antenna that is without physical connection to the cellular telephone.2

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Peak An emphasis over a frequency range not greater than one octave.2

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Peak Input Power The amount of power a voice coil can withstand for short periods of time.2

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PEI Film Polyetherimide. A plastic-based polymer used primarily for tweeters and midrange cones offering high resistance against harsh environmental extremes, superior rigidity, damping and resistance against harsh environmental conditions.1

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Period The amount of time required for a single cycle of a sound wave.2

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Permalloy Tape Head A cassette tape head constructed of permalloy, an alloy made primarily of nickel and iron, used for its superior high resistance and permeability, offering superior frequency response at a low cost.1

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Phase The timing of a sound wave that is measured in degrees from 0 to 360.2

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Phase Shift Frequency interaction in the crossover region of passive crossovers which can cause some frequencies to be delayed with respect to other frequencies.2

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Piezo The name usually given to piezo electric drivers. This type of driver has no voice coil or magnetic assembly. Instead, piezo electric material expands and contracts when voltage is applied. The material vibrates and either radiates sound directly, or drives a diaphragm. They can only be used effectively on high frequencies.2

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Piezo Sensors A type of shock or impact sensor that utilizes the properties of the piezo electric effect inherent in some materials. A Piezo Sensor typically uses a piezo electric element to sense impacts or vibrations applied to the vehicle.2

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Pinswitch A simple spring-loaded mechanical switch used in many different vehicles designed to turn on interior lights when doors are opened. Pinswitches are also used in the installation of most security systems in the hood or trunk/hatch as a means of triggering the system should these points be opened.2

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Point of Entry The term normally used to describe the doors, hood, trunk/hatch, windows, sunroof or any other point through which a thief can gain entry into a vehicle.2

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Polarity In electricity, refers to the condition of being either positive or negative.2

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Polarity Reversal A DPDT switch connected between a pair of DC input terminals so that the polarity of a pair of output terminals can be reversed or switched.2

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Polycarbonate A polymer based plastic material offering superior resistance against resonance.1

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Polypropylene A plastic based material used primarily for speaker cones due to its rigidity, damping and resistance against harsh environmental conditions.1

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Port Diameter The measurement across the port opening. Measured as internal diameter (not outer diameter .4

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Port Length The measurement of the length of the port.4

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Positive LCD A liquid crystal display employing a lit backfield with dark elements. This results in a primarily colored display.1

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Positive Lead The lead or line connected to the positive terminal of a current, voltage, or power source.2

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Positive Verification System (PVS) Part of the MTSO in cellular systems that tries to insure that any invalid mobile numbers will not be allowed to make calls.2

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Potentiometer A variable resistor made with either carbon or wire wound material which attenuates a signal.2

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Power The amount of energy (in joules) that a device delivers or consumes divided by the time (in seconds) that the device is operating.2

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Power Door Locks The feature where the door locking and unlocking of the vehicle is performed by some mechanical means other than human power. Power door locks may be electric, vacuum, electro/vacuum, or a combination of both.2

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Power Line Noise A varying AC ripple that is found riding on a DC voltage. It is recognized by a whining that varies with engine speed.2

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Power Supply See DC/DC Converter.4

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Power Windows The feature where the opening and closing of the vehicle's windows is performed by some mechanical means other than human power. Power windows are typically operated by electric motors.2

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Pre-Amp A circuit unit which takes a small signal and amplifies it sufficiently to be fed into the power amplifier for further amplification. A pre-amp includes all of the controls for regulating tone, volume, and channel balance.2

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Preamp Output Typically found on headunits, a preamp output provides low level, high quality audio signal for use with external amplifiers.1

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Preset A collection of system settings stored in a memory that is virtually instantly recallable, typically at the touch of a button.1

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Primary The input side of a transformer.4

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Programming Adapter A device used for programming cellular telephones that allows the telephone to be programmed only when the device is attached.2

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Program Bank A Custom File feature that allows the user to flag the tracks on a disc, indicating whether they should be played or skipped.1

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Program Play A Custom File feature that allows the user to define a sequence of 12 tracks, in a specific order, for customized playback. Up to two banks of 12 track sequences can be recalled, for up to 24 tracks total.1

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Proximity Sensor A common term for a spatial type sensor that can be either the radar, ultrasonic, or infrared type (Also see Spatial Sensor).2

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PSTN In cellular, refers to the Public Switch Telephone Network. (Sometimes called PTSN, Public Telephone Switched Network).2

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Pulsed Output An output of a security system, usually used to flash parking lights or honk horns, that is pulsed or turned on and off by the security system.2

 

[KARLEON 10+ year member]

Q

Quiescent Current The term given to describe the amount of current consumed by a circuit when it is not performing any work (sometimes referred to as standby current).2

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Qtc The measurement of a speaker and enclosure working together as one.2

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Qts The measurement of the speaker as a motor taking into consideration all mechanical and electrical losses.2

 

[KARLEON 10+ year member]

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

R

Radar Sensor A common name for a type of spatial sensor.2

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Radio Frequency (RF) An alternating current or voltage with a frequency above about 100kHz. It's called radio frequency because these frequencies are radiated as electromagnetic waves by radio ( and now television) stations.4

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Range (Audio) Usually described as frequency range, this is a system's frequency transmission limits, beyond which the frequency is attenuated below a specified tolerance. Also, the frequency band or bands within which a receiver or component is designed to operate.2

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Range (Security) The term used to quantify the maximum operating distance that can exist between a vehicle and the remote control transmitter. Range is usually expressed in feet or yards.2

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Rarefaction A state or region of minimum pressure in a medium traversed by compressional waves (sound waves).2

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Receiver A device designed to receive a signal or command from a source such as a transmitter.2

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Rectification A conversionof Alternation Current (AC) into Direct Current (DC) by means of a rectifier.4

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Relay An electromagnetic switch that allows small, relatively low level signals to operate higher amperage devices. Also used when polarity reversal ins necessary.2

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Remote A common name for the remote control transmitter used with a remote security system (Also see Transmitter).2

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Remote Start The feature where a security system of accessory module allows the vehicle operator to start the engine of a vehicle using a remote transmitter without actually being inside the vehicle.2

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Reset The ability of a security system to automatically stop sounding the siren and return to an armed state after being triggered, as long as no further trigger conditions are present.2

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Resistance The electrical term used to describe the property that various materials possess to restrict or inhibit the flow of electricity. Electrical resistance is relatively low in most metals and relatively high in most nonmetallic substances. Electrical resistance is measured in ohms.2

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Resonance The term used to describe the tendency of objects to vibrate at certain frequencies. This can be a useful or undesirable effect, as in planned enclosure or driver resonance, or as in unplanned enclosure resonance or wall resonance.2

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Resonant Frequency The frequency at which a speaker cone vibrates the easiest-the point at which it has the most amplitude.4

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Retriggering See Alarm Retriggering.2

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RF Modulator A device that converts a signal (typically audio and/or video) into a radio frequency.1

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RF Package An add-on audio system comprised of a CD or MD changer, a CD controller, and an RF modulator. Used to add CD or MD playback ability to virtually any car radio.1

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RGB Transfer Video signal broken down into separate Red, Green and Blue components, and transferred as such.1

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Ripple (Amplifier) A train of pulses that occurs when AC is changed to DC via a rectifier. These pulses are left on the DC.4

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Ripple (Speaker) The maximum deviation from flat response, measured in decibels-it indicates the port's effect on woofer output.4

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RMS Root Mean Square.2

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Roll-Off Relates to the attenuation of frequencies, above or below a given point, at a specific rate.2

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Roof-Mount Antenna A permanently-installed antenna located in the center of the vehicle's roof.2

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Rotary Commander Also called driver's remote. An ancillary control interface providing intuitive and safe operation of a car stereo by keeping your eyes on the road.3

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Rotary Encoder A digital control which emulates the function of a "big round volume knob". Also controls additional preamp functions.1

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Rotary Lever A control arm providing easy access to the Seek and AMS functions, positioned beside the rotary encoder.1

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Rotary Scan Head A magnetic pick-up head, typically used in VCR's and DAT machines, which spins as it reads the information from the tape. Higher signal density is possible, providing more accuracy in recording and playback.1

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RS-232 Interface A standard interface, typically found in the computer industry, used to exchange information between peripherals.1

 

[KARLEON 10+ year member]

S

Santoprene A speaker surround material constructed of Santoprene (a manufactured rubber), offering improved resistance to stretching and deterioration over time compared to Butyl rubber

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SAT In cellular applications, refers to the Supervisory Audio Tone

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Scanning The popular term given to the process a thief uses to break into a remote security system by quickly and sequentially transmitting all the possible security codes of a victim's security system

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SCM In cellular applications, refers to the Station Class Mark

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Sealed Enclosure A type of speaker enclosure with a specific internal volume of air to enhance the speaker's response

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Seat Position A DSP parameter that correlates to the apparent location in a specific listening environment

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Seat Sensor A pressure activated switch designed specifically for use in detecting any pressure applied to a vehicle's seat

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Secondary The output side of a transformer

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Second-Order The frequency attenuation that occurs at a rate of 12 dB per octave

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Segmented Display An entry level display type that employs a number of elements which make up the display characters, e.g., digital clock display

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Selectivity Tuner specification which defines the tuner's ability to reject adjacent station interference

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Sensitivity The rating of a loudspeaker that indicates the level of a sound intensity that the speaker produces (in dB) at a distance of one meter when it receives one watt of input power

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Sensor A device designed to detect or sense an intrusion or attack upon a vehicle by monitoring such things as motion, vibration, impact, sound, or the presence of a foreign mass

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Sensor Bypass The ability of a security system to automatically or manually delete or bypass the triggers from all or some of the sensors tied into the security system

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Shock Resistant Memory (SRM) See ESP

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Shock Sensor A sensor that is specifically designed to detect a shock or impact applied to the vehicle

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Short Circuit The condition that occurs when a circuit path is created between the positive and negative poles of a battery, power supply, or circuit. A short circuit will bypass any resistance in a circuit and cause it not to operate

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Shuffle Play A feature which employs random selection from available tracks

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Signal-to Noise Ratio A ratio which indicates how much audio signal there is in relation to noise, or a specified noise floor

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Silicon Dampened Suspension A shock isolation system employing silicon filled shock absorbers, for increased resistance to road vibrations and othershocks

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Simplex In cellular applications, a type of hands-free microphone which permits only one side of the conversation to be heard at any time

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Siren Any device, mechanical or electronic, that is designed to produce a loud warning sound when triggered by a security system

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Sound A type of physical kinetic energy called acoustical energy (Also see Acoustical Energy)

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Sound Discriminator A device designed to listen to, evaluate, and discriminate between the sounds that may be heard within the interior of a vehicle, and then trigger the security system should the sound fit within the parameters of what the sensor is designed to react

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Sound Pressure Level (SPL) An acoustic measurment for the ratios of sound energy. Rated in decibels (SPL dBA, SPL dBC)

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Sound Waves Fluctuating waves of pressure that travel through a physical medium such as air. An acoustic wave consists of a traveling vibration of alternate compressions and rarefactions, whereby sound is transmitted through air or other media

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Source Impedance A parameter of an audio component referring to the output impedance. A low output impedence is preferred

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Source Tone Memory A Custom File feature which allows the user to assign a collection of tone control settings to a particular source, such that anytime that source is selected, those tone control settings are automatically recalled

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Spatial Sensors Devices specifically designed to detect intrusions into or around the vehicle by monitoring the space in and around the vehicle for intruders. These sensors work on a variety of different principles, including ultrasonics, radar radio frequency, or infrared

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SPDT Single Pole Double Throw. A relay that has only one pole or contact but whose contact can throw or make electrical contact with two separate stationary contacts. This is the most commonly used relay in the mobile electronics industry

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Spectrum Analyzer A device that displays a frequency response curve, in real time, as the curve, changes

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Spider A flat, round, springy device that holds the vibrating cone of a dynamic loudspeaker. The spider is where the diaphragm meets the voice coil

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Spontaneous Twin Drive A proprietary Sony amplifier power supply technology which employs separate voltage rails for different amplifier stages. This methods provides greater headroom and helps prevent clipping

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SPST Single Pole Single Throw. A relay that has only one pole or contact and can only throw or make electrical contact with one stationary contact

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SSIR Sony Super Interference Rejection. Sony's proprietary FM front end enabling both excellent sound quality and clear reception

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SSIR-EX An improved version of the SSIR FM front end which offer better sensitivity, selectivity, capture ratio and stereo separation specifications

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SSIR-EXA See adaptive reception

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Starter Disable Any circuit or device used alone or in conjunction with a security system that is designed to prevent the vehicle's starter from operating

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Station Memo A Custom File feature that allows the user to assign an eight character name to a tuner frequency

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Status The state that a system is in at any given time

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Stroke The distance that the speaker cone or voice coil can travel in both directions

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Strontium Magnet A magnetic material with superior magnetic strength characteristics to that of ferrite

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Sub Output A separate output connection specifically designed to drive a sub woofer system

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Subwoofer A loudspeaker made specifically to reproduce the lowest of audio frequencies, approximately between 45 Hz and 125 Hz

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Super Nemonic Twist A passive matrix display type which offers 100ms response times, a 140 degree viewing angle, and high-quality color. Approaches active matrix types at about half the cost

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Super Suspension System A shock isolation system employing silicon filled shock absorbers, for increased resistance to road vibrations and other shocks

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Switch A switch is any form of mechanical, electronic, electromechanical, magnetic, or mercury device that either opens or closes a circuit

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Switch Sensing Switch sensing refers to the inputs on a security system designed to detect a switch closure from such triggers as a door, hood, or trunk/hatch pinswitches

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System Reset See Reset and Alarm Reset

 

[KARLEON 10+ year member]

T

THD Total Harmonic Distortion. A component specification which describes its ability to accurately reproduce a signal. Although lower numbers are considered to be better, the human ear typically cannot detect THD ratings below 2% or 3%.3

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Thin Film Transistor (TFT) Active Matrix Display A specific type of LCD display in which one to four transistors control each pixel. This technique offers the best resolution of all LCD, flat panel display types.1

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TOC (Table Of Contents) The digital subcode information that identifies a disc, indication the number of tracks, the starting and ending points of these tracks and the total running time of the disc. When include, CD Text information is stored in the TOC.1

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Toroidal Coil An inductor or transformer whose core consists of a concentrically wound ribbon of magnetic material. Also used to filter noise on a DC supply line.4

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Trace The path of conductive material that conveys voltage or current from one point to another on a printed circuit board. Traces add resistance to the circuit .4

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Transceiver A combination radio transmitter/receiver usually installed in a single housing and sharing some components.2

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Transducer Any device which converts energy from one form to another, i.e., electrical to acoustic or vice-versa. Loudspeakers and microphones are two types of transducers.2

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Transformer An electrical device that can be used to provide circuitry isolation, signal coupling, impedance matching, or voltage step-up .4

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Transients A non-repeating sound (such as percussion in music) or an abrupt change of voltage. How a speaker handles transients is a good indicator of its performance .4

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Transistor An active (commonly three terminal) solid-state device in which a larger output current is obtained by small changes in the input current.2

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Transmitter The name given to the hand-held remote control unit used by a vehicle operator to arm/disarm and perform accessory functions on a vehicle security system. More commonly called a remote.2

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Trigger The common name for any type of stimulus that will cause a security system to produce an alarm. A trigger could come from a pinswitch, a sensor, or a direct command from a transmitter or accessory button.2

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Trunk Lines The way the cellular system transfers the mobile calls to the landline network.2

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Trunk Release The ability of a system to release the latch of the trunk/hatch by remote control.2

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TV Control The ability of a component to operate a TV tuner.3

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Tweeter A small loudspeaker or driver meant to reproduce treble frequencies.2

 

[KARLEON 10+ year member]

U

Ultrasonic Sensor A form of spatial sensor that is designed to detect an intrusion into a vehicle by monitoring the space within the vehicle with ultrasonic energy.2

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Unfused Wire Any section of wire between the power supply and a load that does not include the protection of a fuse or circuit breaker.2

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Unilink Sony's proprietary control bus technology incorporation "serial", two-way communication between all components on the bus.1

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Unloading The tendency of an enclosure to produce no spring or pressure on the woofer. Unloading produces an uncontrollable over-excursion of the woofer cone (it vibrates out of control); the speaker will exhibit low power handling at lower frequencies

 

[KARLEON 10+ year member]

V

Valet A word used to describe the state in which a security system may be placed in which it would be prevented from arming passively and/or actively.2

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Valet Switch The switch designed to provide control to place the security system into or bring the system out of the valet state.2

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Variable Coefficient Digital Filter A feature which allows the user to adjust the oversampling process. Changes to the phase and impulse response can be achieved which allow fine tuning the filter to adjust for various source material, system parameters, and room acoustics.1

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Variable LP/HP Filter Crossover components which offer adjustable cut-off frequencies, and levels.1

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Variable Resistor (VR) A wire-wound resistor in which resistance can be changed to vary the amount of current or voltage that the resistor passes through the circuit .4

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Vas Compliance. A measurement in liters or cubic feet of the volume of air that is equal to the compliance of the speaker's total suspension.2

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Vented Enclosure A type of speaker enclosure with a vent (or port). The combination of: (1) the specific internal volume of air and 2) the action of the port allowing some sound waves from the enclosure's interior to pass through, enhances the speaker's response .4

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Voice Coil A coil of wire and the former (bobbin) around which the wire is wound. It is part of a speaker's electromagnetic motor that drives the cone to produce sound waves .4

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Voice Guide Confirmation A feature which provides audible confirmation of a system adjustment. Voice confirming control inputs reduces need for the driver to divert eyes from the road.3

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Voltage Electromotive pressure that forces current through an electrical conductor. The difference of potential between any two conductors of a circuit .4

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Voltage Drop The amount of energy consumed when a device has resistance in its circuit. The voltage (E) set up across a resistance ® carrying a current (I). E=IR (Also see Volt).2

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Voltage-fed Antenna An antenna in which the feeder is attached to the radiator at a voltage loop. This type of antenna does not require a ground plane.2

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Voltage Sensing A name given to a form of alarm system trigger that relies on sensing a change in the voltage of the vehicle (Also see Current Sensing).2

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Volt The term used to refer to the property of electrical pressure through a circuit. The basic practical unit of difference of potential.2

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Volume The amount of space occupied in three dimensions (it's cubic space)-in the case of enclosures, the space inside. It can also refer to the loudness of sound .4

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VOM Volt-Ohm-Meter, sometimes called a Volt-Ohm-Milliammeter. A multimeter that measures voltage, ohms, and milliamperes.2

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VSWR Voltage Standing Wave Radio. In a standing wave system, the ratio of the voltage of the incident wave to the voltage of the reflected wave.2

 

[KARLEON 10+ year member]

W

Watt The basic practical unit of measure for electrical or acoustical power.2

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Wattage Electrical power.2

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Wave A single oscillation in matter (i.e., a sound wave). Waves move outward from a point of disturbance, propagate through a medium, and grow weaker as they travel farther. Wave motion is associated with mechanical vibration, sound, heat, light, etc.2

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Waveform The shape of a wave.2

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Wavelength The length of distance a single cycle or complete sound wave travels.2

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Wide-Bit Stream Processing This technology maintains 20-bit precision through the recording process, for clearer reproduction of delicate, low-level music.1

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Windings The wire in a voice coil that is wound around the former (also called a bobbin) to create a coil.4

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Window-Clip Glass-Mount Antenna A non-permanently installed antenna used in cellular applications.2

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Window Roll-Up The term used for the feature that causes the window(s) on a vehicle to close upon arming, or open and close as part of a convenience feature of a security system.2

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Woofer A large dynamic loudspeaker that is well suited for reproducing bass frequencies.2

 

[KARLEON 10+ year member]

X

Xmax The distance a speaker cone can travel before the magnet loses control over the voice coil.2

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X-tal Lock Sony's proprietary tuning technology which employs a quartz crystal to generate a reference frequency from which all others are derived. Assures accurate frequency selection.1

Y (none as of now)

Z

Zero Bit Detection A circuit in a D/A converter that monitors the digital audio bit stream. upon encountering all bits low, or zero bits, the output of the D/A is disconnected from the preamp. This improves the signal-to-noise ratio specification.1

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Zero Output The absence of output signal or output power.2

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Zone The specific area of the security system's coverage or a term used to describe a specific trigger input.2

 

[jer_stud56 10+ year member]

Yay. Was this on a website or something? Could've just posted a link to save some bandwidth...heh. But whatever gets everyone to understand it. We'll send the newbies here from now on. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[KARLEON 10+ year member]

Yea, i thought about all the newbies who doesnt know what certain terms mean we use, and i figured their should be a thread here that addresses that. I didnt even think about the bandwidth, but i know how lazy some people can get and even if you post a link, you will have that few who wont open it and would rather post another thread asking what does such and such mean.

 

[KARLEON 10+ year member]

Cant find what you are looking for in this thread? Then check out these other helpful sites....They might have what you are looking for.

http://diyaudiocorner.tripod.com/def.htm

http://www.electronixwarehouse.com/education/glossary.htm

http://www.sonicspot.com/guide/glossary.htm

http://www.elitecaraudio.com/tips/car_audio/terms/

http://www.audioc.com/information/audio_glossary/glossary.html

http://www.stereophile.com//reference/50/index1.html

http://www.carsound.com/glossary.shtml

http://www.jasonlorette2.50megs.com/photo2.html

http://www.mmxpress.com/jvc/glossary.html

http://www.thespeakerstore.com/glossary/glossary.htm

http://www.lakelandmusic.com/article_AudioTerms.htm

http://www.silcom.com/~aludwig/glossary.htm

http://www.caraudioresources.net/tech/glossary.html

Just to name a few //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[kickerlivinloud 10+ year member]

Good stuff Karleon......:thumbsup

Jon

 

[administrator Administrator]

Thanks for taking the time to do this! I sticky'd it so everyone will see it.

 

[KARLEON 10+ year member]

Thanks for taking the time to do this! I sticky'd it so everyone will see it.

No problem.