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Superglossary - Home audio Category: Technical and IT > Home audio equipment Date & country: 09/12/2013, USA Words: 524

Flux
The flow of magnetic energy in a circuit. Flux density is the measure of the strength of the magneti

Former
The cylindrical portion of a speaker's voice coil section. A wire is wound around this cylinder to f

Free Sound Field
A sound field without acoustic boundaries or where the boundaries are so distant as to cause negligi

Free-Air Configuration
This description usually indicates a speaker that, in the opinion of the manufacturer, is suitable f

Frequency
1. The property or condition of occurring at frequent intervals. 2. Mathematics. Physics. The number

Frequency Modulation (FM)
In radio broadcasting, a method of modulation in which the frequency of the carrier voltage is varie

Frequency Response
The range of frequencies that a speaker will reproduce (lowest frequency to the highest). While the

Front Speakers
In home theater, the front left and right speakers deliver a wide soundstage that blends with the vi

Fs
Fs or Free Air Resonance is the frequency at which a speaker naturally resonates, like a tuning fork

Full Logic Deck
A cassette mechanism where the tape operations are carried out by logic circuit operated solenoids r

Fuse
A device designed to provide protection for a given circuit or device by physically opening the circ

Fusible Link
Designed to perform the same task as a fuse, but the resembles a wire. Fusible links are commonly us

Gas Plasma
Gas plasma emitters are a type of Horn Driver wherein a plasma or ionized gas field is developed and

Generator
A machine that produces AC electricity from a rotating coil interaction within a magnetic field. In

Gig
Slang for job, engagement of musicians to play and perform.

Granulation Noise
A type of audible distortion resulting from quantization error in digital transmission modes.

Graphic Equalizer
A multi-band variable equalizer using slide controls as the amplitude adjustable elements. Named for

Grill
A barrier meant to prevent damage to the Driver that it covers, or that creates a more attractive ap

Ground
A term that describes anything having an electrical potential of zero relative to other points in a

Ground Loop
The term given to the condition that occurs when a voltage potential exists between two separate gro

Haas Effect
Also known as precedence effect, describes the human psychoacoustic phenomena of correctly identifyi

Hard Dome (Tweeter)
A characteristic of some Dome tweeters in which the dome is made of some light, hard metal such as n

Harmonic Distortion
A type of Distortion in which resonance or sympathetic ringing vibrations are added to the original

Harness
The universal name for a bundle or loom of wires that compose the wiring for a system.

Hatchback (Box Or Enclosure)
An enclosure of such size and shape as to enable its efficient use in hatchback-style vehicles. Norm

Headroom
A term related to the dynamic range of amplifiers, used to express in db, the level between the typi

Heat Dissipation
The function of transfering heat away from a component into the air to prevent damage to the output

Heat Sink
Parts of an amplifier, typically heavy metal 'fins,' and a section of the frame of the speaker used

Hertz (Hz)
The measurement of frequency. One hertz is equal to one cycle per second, or the complete cycle of a

High Fidelity
A method of sound reproduction that emphasizes the highest possible adherence to the exact character

High Level Input
An audio input configured to accept speaker level signals.

High Pass Filter
An electronic filter of a type commonly incorporated in Crossover circuits that permits the passage

High Power Output
Speaker level outputs driven by an amplifier, typically at least 15 watts RMS per channel.

High Voltage Switching Power Supply
An amplifier's internal power supply that converts the vehicle's 12 volts to higher voltage for impr

Horn
A type of speaker system now principally used for high-frequency reproduction, but which is capable

Horn Tweeter
A driver consisting of a relatively small emitter surmounted by a curvilinear or exponential horn. T

Hum Components
The residual artifact harmonics of the AC power supply. In the U.S. the use a 60-Hz system, places t

Hyperbaric Resonator Impulse
An audible event characterized by a sudden and often unexpected pressure wave emanating from a vent

Hypercardioid
A narrower heart-shaped pick-up pattern than that of cardioid microphones.

Imaging
Imaging describes the extent to which an audio system reproduces the directional cues that enable th

Impedance
The totality measured in Ohms of all electrical opposition to current flow

Inductive Coupling
Radiated noise that is transmitted through a magnetic field to surrounding lines. This frequently oc

Inductor
A transformer, or an electrical component in which impedance increases as the frequency of the AC de

Infinite Baffle
An infinite baffle speaker design is defined as an enclosure that contains a greater volume of air t

Infrasonic
Waves or vibrations with frequencies below that of audible sound (20 Hz.).

Input Overload Distortion
Distortion caused by too great an input signal being sent to an amplifier or preamplifier. It is not

Input Sensitivity
Is the SPL (sound pressure level) a speaker will produce given one watt of power as measured from on

Input Voltage
The power voltage provided to an amplifier. While most cars can be expect to reliably produce 12 vol

Insertion Loss
The loss of voltage (or power), as measured in db, resulting from placing a resistor (or some other

Institue of High Fidelity (IHF)
The premier institution for high fidelity whose standards have come to be universally recognized in

Insulation Or Insulator
A non-conductive protective covering for electrically active parts and wire that prevents short circ

Interface
A device or protocol which facilitates the linking of any two devices or systems; or when used as a

Intermodulation Distortion
A species of Distortion that results when one set of frequencies is superimposed on, or is modified

Inverse Square Law
In mathematics, the law that states that in the absence of reflective surfaces, sound pressure (or l

Iso-Din Mounting
Refers to a receiver mounting system in which the headunit is mounted behind the dash panel with sid

Isobarik
Sometimes spelled Isobaric, this is an enclosure design in which two or more Drivers are coupled tog

Isolation
Electrical or acoustical separation to prevent the spread of noise and the effect on the signal of u

Jack
A receptical for a plug used to interconnect electronic devices.

Joule
A unit of energy equal to one watt per second.

Jumper
To provide a temporary circuit around a component or other circuit A device that anables this action

Kapton
A voice coil design in which multiple layers are used on a Kapton coated coil form to create the rot

Keypad
A panel usually made of metal or plastic with numbered push-button switches (like a touch-tone telep

Kilohertz (Khz)
A frequency of one thousand (1,000) cycles per second.

Kirchoffs Current Law (KCL)
A law stating that the total current entering a point or junction in a circuit must equal the sum of

Kirchoffs Voltage Law (KVL)
A law stating stating that the voltage supplied to a DC circuit must equal the sum of the voltage dr

Lcd
Liquid Crystal Display. Probably the most common way of showing visual information on non-computer e

Le
The electrical inductance of a speaker

Lfe Input
Found on some powered subwoofers, this special preamp-level input accepts the 'Low Frequency Effects

Limiter
An electronic compressor with a fixed ratio of 10:1 or greater. The dynamic action effectively preve

Line-Level
Standard +4 dbu or -10 dbv audio levels. Used in communicating standard signals between processing d

Linear
1. Referring to mechanical movement, the ability of the voice coil to move in and out in the air gap

Linear Phase Response
Any system which accurately preserves phase relationships between frequencies.

Linearity
The degree to which a given transducer or amplifier can produce an equal response within its specifi

Listening Position
A feature which can optimize frequency response and imaging for a particular position in a vehicle t

Load
The resistance or impedance to which energy is being supplied. In amplifiers, the speaker or speaker

Loss
The difference between potential energy output and actual energy output.

Lossy Compression
A type of data compression which permanently discards data that humans supposedly 'cannot hear' to c

Loudness
The Sound Pressure Level of a standard sound which appears to be as loud as the unknown. Loudness le

Loudness Compensation
When played quietly, this switched circuit allows fuller apparent sound from a system such that the

Loudspeaker
An electro-acoustic transducer that converts electrical audio signals at its input to audible sound

Low Frequency
Refers to radio frequencies within the 30-300 khz band. In audio it usually refers to frequencies in

Low Pass Filter
A network of components which attenuate all frequencies above a predetermined frequency selected by

Low Q
A low Q, or QTS, (reactance) woofer Driver is desirable for use in a vented enclosure.

Magnet Boot
A rubber or plastic cover for the magnet housing for protection or appearance, mostly the latter.

Magnet Structure
A combination of magnetic material and connected field concentrators that creates the magnetic field

Magnetic Flux Density
The measurement of magnetic flux, in units of Gauss, inside the air gap in which a voice coil of a s

Mash
An acronym for Multi-stage noise shaping. This is the name given to the digital advances that were i

Matched Components
A typical separates system includes a separate woofer, tweeter, and external Crossover, all of which

Memo List
A Custom File feature that allows the user to toggle through the discs, selection titles, or station

Memory
The word most commonly used to refer to a system's ability to retain specific information, particula

Metal Tape Eq
An equalization circuit that compensates for the unique frequency response characteristics of metal

Microbar
1. A unit of atmospheric pressure equal to one millionth of a bar. 2. A place to consume the product

Microprocessor
A multiple semiconductor IC device that can be dedicated or programmed to perform a variety of tasks

Midbass
Those frequencies roughly between 100 and 300 Hertz. (CPS)

Midi
Acronym for Musical Instrument Digital Interface, a standard adopted by the electronic music industr

Midi Files
A computer file format containing musical information and performance data capable of being used in

Midrange
A Driver that is usually much smaller than a woofer, but with a surface area greater than the typica

Milliamps
A unit of measurement of electric current equal to 1/1000th of an ampere. The milliampere is the mos

Mixer
At its simplest level, an audio processing device used to add (combine or sum) multiple inputs into

Mono (Monaural)
The operation of an amplifier in one channel for both input and output. Can refer to an amplifier wi