A speaker system with two types of drivers (see also COAXIAL)
A speaker system made up of three different types of drivers.
Advanced Audio Distribution Profile (A2DP) This profile defines how high quality audio, stereo or mono can be streamed from one device to another over a Bluetooth connection.
Android Auto is a smartphone projection standard developed by Google to allow mobile devices running the Android operating system (version 5.0 "Lollipop" and later) to be operated in automobiles through the dashboard's head unit.
The standard offers drivers control over GPS mapping/navigation, music playback, SMS, telephony, and web search
its key feature is hands-free operation through voice commands and is compatible with apps including Google Maps, Google Play Music, MLB at Bat, Spotify, Songza, Stitcher, iHeart Radio, and TuneIn.
To turn down or reduce.
Designed to reduce signal overload to correct distortion while returning audio to the correct volume
Usually accompanies track search and allows the user to skip from the end of one track to the beginning of the next missing out any blank or unrecorded passages on the tape.
Automatic equalization sets the bass, middle and treble at the optimum level to improve your listening experience
Head unit's volume automatically increases along with car's speed eg. JVC's Cruise Control.
Benefits the long distance driver by scanning the waveband in the area of travel and automatically storing five or six strongest stations in order of signal strength.
Auxiliary Input. A basic connection between an mp3 player & a car stereo. The connection is made via a cable with a 3.5mm headphone jack at each end.
The angle of contact between head and tape during recording and playback. Should be as similar as possible for the most faithful reproduction and the best quality.
Memory backup stores your pre-set stations and settings when the radio is turned off
A combination of high and low pass filters connected in series with an overlap between the lower and upper freqencies, usually used for the mid-range in a 3-way component system.
The lower end of the frequency spectrum, sometimes also known as mid-bass.
The Bass Boost button. It's supposed to be used when you're listening to music at lower volume levels. Remember from above that at low volume levels we don't hear the low end and high end as well. When you engage the Bass Boost button on a system it gives a little EQ boost to the low and high end of the material it's processing.
Bluetooth is a wireless technology standard for exchanging data over short distances. This data can be text, photographic or audio. Bluetooth is used mainly in car audio for making and receiving telephone calls.
This unit will be Bluetooth enabled with an optional adapter
Where the two separate outputs of some stereo amplifiers can be conbined to give a mono signal.
CarPlay is a smarter, safer way to use your iPhone in the car. CarPlay takes the things you want to do with your iPhone while driving and puts them on your car�s built-in display. You can get directions, make calls, send and receive messages, and listen to music, all in a way that allows you to stay focused on the road. Just connect your iPhone via USB and go.
Speakers which have two separate drive units (normally a small woofer and tweeter) moving independently. Essentially this gives better high frequency response and hence greater range and clarity.
Separate speakers, usually a tweeter and mid-range with appropriate crossover.
A selective filter which splits signals into different frequency bands that can be fed independently to separate speakers. A passive crossover filters signals after they have been amplified. An active crossover (more effective and flexible) filters signals before amplification, sending different signals to different amps.
The level of stereo separation ie. the isolation of the two channels of a system.
Clock Time. See RDS
DAB is a digital radio technology for broadcasting radio stations. DAB is more robust with regard to noise and multipath fading for mobile listening.
Digital Audio Tape. Medium used in the pro sector for reproducing pre-recorded material in digital format on tape - not to be confused with DCC.
Philips Digital Compact Cassette, a medium of digital cassette designed to replace the familiar analogue cassette.
Enables you to remove the car stereo faceplate to deter thieves
DIN E is the German standard of measurement for most in-dash players to enable sets to be fitted in standard slots.
A red indicator blinks on the unit after the faceplate is removed, warning potential thieves
A video codec which became popular due to its ability to compress lengthy video segments into small sizes while maintaining relatively high visual quality.
Dynamic Noise Reduction. Similar to Dolby but not as effective.
Digital Sound (Signal) Processor. Lets you programme a listening environment pattern and change the sound to suit the music. A type of super equaliser.
Speakers which have two cones; the second cone is usually much smaller and glued directly to the centre of the main cone although it has just one voice coil.
Different audio areas of your vehicle, i.e. rear seats rather than front seats
Enables you to set audio to be heard in a particular area of your vehicle, i.e. rear seats rather than front seats
New technology to guarantee perfect FM reception due to much higher selectivity plus improved sensitivity.
Enhanced Other Networks. Allows interruption of RDS bulletins from other local stations.
Equalisation. Each EQ band influences different qualities of a mix or instrument:
- 50-60 Hz � adds thump in a kick drum and boom in a bassline
- 100-200 Hz � adds punch in a snare and richness
- 200-500 Hz � adds warmth and weight in guitars, piano and vocals
- 500-1000 Hz � adds body and tone to many instruments
- 2 kHz � adds clarity, edge and bite to guitars and vocals
- 5-10 kHz � adds clarity, openness and life, especially drums
- 16 kHz � adds air, space or sparkle
Control which balances sound from front to rear in a four speaker set-up
enjoy FLAC lossless digital audio files in your vehicle with playback output at CD quality, without the need to convert
Free Lossless Audio Codec compresses audio without any loss in quality
Term relating to subwoofers which are designed to work most efficiently in free air using the boot for example, as an enclosure. Also known as 'infinite baffle'
A car audio system's frequency response represents how much of the audible frequency spectrum it can reproduce. The frequency response of a car audio system can be measured by an instrument known as a real-time analyzer (RTA), which consists of a microphone attached to a processor with a display that has a graph that shows a system's response.
Feature of autoreverse decks where fast forward is always forwards, rewind is always rewind, regardless of tape play direction.
Speakers designed to give a wide frequency response.
Degree of signal amplification, achieved by an amp, tuner or pre-amp circuit. Expressed in decibels (dB)
Controls connections in Bluetooth and enables your device to be visible to the world
High-Definition Multimedia Interface supports image or video play back on HD TV or PC
Unit of measurement for frequency, oftem written as Hz or kHz
An input configured to accept speaker level signals
(Capacitor) Essentially allows more signal to pass through the higher the signal gets, typically used and supplied with tweeters.
Enables the connection of devices used by Bluetooth HID such as keyboards, pointing devices, gaming devices and remote monitoring devices.
Impedance is a measure of something that opposes/restricts the flow of current in an electrical circuit. In this case, that something is a speaker.
Connects you to the Inrix network, the world�s leading provider of traffic information
This function stores the optimum acoustic field set by an expert installer to suit your vehicle
Plays approximately the first 10 seconds of every track on a tape/CD
Allows audio devices to be quickly connected without need for wiring
Pinch roller release when cassette is not in use to prevent tape damage
Two levels of sensitivity for tuner searching, local and distant.
Boosts low frequencies. Useful at low volumes but most loudness circuits can cut off an unacceptable amount of treble.
(Inductor or Choke) Allows more signal to pass through the lower the signal gets - ideal for a sub.
Play your iPod/iPhone on this unit via the front/rear USB port
Panasonic's Multi Stage Noise Shaping - Latest Digital/Analogue technology.
Medium Density Fibreboard. Used for building bass enclosures, door panels etc.
Mobile High-Definition Link allowing mobile phones, tablets and other devices to be connected
As the name suggests, frequencies in the middle of the frequency range.
Amplifier power supply switching device designed for optimum performance.
(Denon, Philips, Radiomobile) Music search system. See TRACK SEARCH
Annoying 'chopping' interference on FM caused by reception of a signal that's been reflected (ie. off tall buildings)
A measurement used of how much the flow of electricity is restricted or impeded. The higher the measurement the higher the resistance.
Method used in a CD player to reproduce digital information as faithfully as possible in analogue form, a part of the digital to analogue conversion process.
Phase Locked Loop keeps FM signals locked on station.
If the port length and diameter is correctly matched to the box volume and subwoofer's characteristics it will greatly increase efficiency and a good ported box offers lower distortion.
Controls volume relation between front and rear speakers connected to built-in amplifier.
System loads and ejects CD or tape automatically.
Holds controls for volume, bass and treble but has no on-board amplification.
Adjusts front/rear balance at pre-amp level, used in combination with pre-outs and external amplifiers.
A pre-amp output (pre-out) on a head unit allows the addition of an amp or other peripherals when system building.
Stations which can be held in a tuners memory for instant recall.
Cassette function which allows user to switch from one side to the other.
Quick Release Bracket, denotes extractable unit.
Displays on screen warning of a hazard when you are reversing your car
When you reverse your car the reverse camera automatically switches to the camera
Radio reception when tape is set for fast forward or rewind
An RCA connector, sometimes called a phono connector is a type of electrical connector commonly used to carry audio and video signals. The name "RCA" derives from the Radio Corporation of America, which introduced the design by the early 1940s for internal connection of the pickup to the chassis in home radio-phonograph consoles.
RADIO DATA SYSTEM. Traffic information system on FM. RDS shows station name display (PI/PS) and delivers traffic bulletins (TP/TA) Also locks onto best possible frequency for a station in a particular part of the country (AF) Can display time and date on the receiver (CT) Sets with PTY (Programme Type) will automatically tune into a station broadcasting Pop, Classical, News etc.
Root Mean Square. "RMS power" is sometimes used in the audio industry as a synonym for "mean power" or "average power".
Root Mean Square, a realistic measurement of the maximum output of an amplifier. The higher the figure the more powerful the unit.
The point at which the frequency level/performance of a speaker decreases.
Real Time Analyser. Piece of equipment which measures frequency response and SPL level.
Secure Digital or (SD) is a memory card format for use in portable devices, such as mobile phones, digital cameras, sat nav units, tablet computers & more recently car stereo units.
German traffic information system.
Set your own number-based security code, deters thieves by disabling unit when input incorrectly
The sound pressure level a speaker produces when fed by a given input power, measured at a specific distance on axis directly in front of the speaker. Typically specified in dB SPL at 1 meter with 1 watt of input signal
Enables you to connect more than one Bluetooth device to your car audio system
Indicates how much irritating background hiss is produced as a proportion of the full output power. Numbers higher than 90dB are acceptable. A good indicator of the quality of the amp.
Enables you to connect any one Bluetooth device to your car audio system
make use of your iPhone's Siri functionality through your unit's external microphone and the speakers of your vehicle
Smooth Graphical User Interface � visually smooth graphics that respond quickly to inputs
Sound Pressure Level. Monitored using pro kit and measured in decibels - basically the amount of volume produced.
Recognises music streaming service Spotify, enabling you to play your Spotify playlists
Where the listening perceives the origin of the music to be coming from.
Maintain the controls of your steering wheel with an optional adapter.
The 'thumping rumble' in a system.
Large speakers designed to produce the low frequencies, designed to be used in a cabinet, tube or free-air application.
Total Harmonic Distortion
Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to drivers. It is typically digitally coded using the FM-RDS system on conventional FM radio. It can also be transmitted on DAB
Traffic Programme/Traffic Announcement. See RDS
Tape facility which means you can rewind or forward to the next track and in some cases to any selected track.
Reproduce the higher frequencies (treble), they are generally fairly small.
Sony bi-directional 8-pin BUS connector for centralised multi-media control from a master unit.
Universal Serial Bus (USB) is an industry standard developed in the mid-1990s that defines the cables, connectors and communications protocols used in a bus for connection, communication and power supply between computers and electronic devices & more recently car audio products. You can play back your saved music or video content in many formats such as mp3, wma, aac, divx, avi.
Windows Media Audio (WMA) is an audio data compression technology developed by Microsoft.
This unit will work with your iPhone with either an optional cable or the white USB cable which came bundled with your iPhone.
Caused by any variation in the speed of the tape transport. The lower the figure the better and hence the lower the level of variation through the speakers.