Knowledge Base

Ever wondered what all those technical phrases mean? You will find the answers on this page.





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.


This profile defines how multimedia audio can be streamed from one device to another over a Bluetooth connection (it is also called Bluetooth Audio Streaming)

Android Auto

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. It's 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.


Auto EQ

Automatic equalization sets the bass, middle and treble at the optimum level to improve your listening experience
Aux In
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 lower end of the frequency spectrum, sometimes also known as mid-bass.

Bass Boost

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.

Bass Reflex

See 'Port'


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.

Bluetooth Ready

This unit will be Bluetooth enabled with an optional adapter

Car Play

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.


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.


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-to-Analogue Convertor

Detachable Faceplate

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.

Disabled System Indicator (DSI)

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.


Digital Sound (Signal) Processor. Lets you programme a listening environment pattern and change the sound to suit the music. A type of super equaliser.


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 drum

    • 16 kHz = adds air, space or sparkle



enjoy FLAC lossless digital audio files in your vehicle with playback output at CD quality, without the need to convert

Frequency Response

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.


Degree of signal amplification, achieved by an amp, tuner or pre-amp circuit. Expressed in decibels (dB)


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

High Level Input

An input configured to accept speaker level signals


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.


Boosts low frequencies. Useful at low volumes but most loudness circuits can cut off an unacceptable amount of treble.


Medium Density Fibreboard. Used for building bass enclosures, door panels etc.


As the name suggests, frequencies in the middle of the frequency range.


A measurement used of how much the flow of electricity is restricted or impeded. The higher the measurement the higher the resistance.


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.


Holds controls for volume, bass and treble but has no on-board amplification.


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.


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".

SD Card

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.


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


Sound Pressure Level. Monitored using pro kit and measured in decibels - basically the amount of volume produced.


Large speakers designed to produce the low frequencies, designed to be used in a cabinet, tube or free-air application.


Reproduce the higher frequencies (treble), they are generally fairly small.


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.

Works With IPhones

This unit will work with your iPhone with either an optional cable or the white USB cable which came bundled with your iPhone.