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[CrEaTrE]

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Ignition Kill A device designed to prevent the vehicle's ignition circuit from operating. An ignition kill device can work by either interrupting one or both of the primary wires leading to the ignition coil or by shorting out (grounding) the ignition coil's positive primary wire. Also called an Ignition Disable.2

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Ignition Power Refers to a source of power in the vehicle, controlled by the ignition switch, that has +12VDC on it when the ignition key is both in the run and start positions.2

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IIR Filter (Infinite Impulse Response Filter) A digital filter employing a single stage, through which the signal is passed repeatedly to achieve the desired processing effect. Offers simplicity of design and lower cost than the FIR type.1

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Imaging The effect of reproducing a sound stage faithful to that of an original recording. Represented, for instance, in the listener's ability to place a particular instrument at a single point, rather than to hear it as if spread throughout the sound field. Good imaging is often described in terms of channel separation of openness.4

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Impact Sensor A sensor designed to detect various degrees of impact or vibration applied to the vehicle and then produces an output to trigger a security system.2

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Impedance (Audio) A measurement of the resistance to the audio current by the voice coil of the speaker (Also see Nominal Impedance).2

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Impedance (Electrical) The total opposition offered by a device or circuit to the flow of alternative current.2

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In-Line Fuse A fuse and holder incorporated into a length of supply wire .4

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Inductive Coupling Radiated noise that is transmitted through a magnetic field to surrounding lines.2

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Inductor An electrical component in which impedance increases as the frequency of the AC decreases. Also known as coils that are used in passive crossovers. Inductors are rated in Hennes.2

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Infinite Baffle A loudspeaker baffle of infinite space that has no openings for the passage of sound from the front to the back of the speaker. Also, a sealed enclosure where the internal volume is greater than the Vas of the driver.2

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Infrared Sensor A type of spatial sensor that uses infrared energy to detect an object (a hand, arm, or body) entering a protected area (Also see Spatial Sensors).2

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Input (Audio) The high level (speaker) or line level (RCA) signal connections that run into one component from another system component.2

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Input (Security) Any wire on a security system designed to accept a signal from some outside source such as the vehicle's wiring. Door trigger, hood trigger, trunk trigger, and sensor trigger wires are all inputs.2

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Instant Trigger The term used to describe any trigger input on a security system that is designed to cause the system to respond instantly when triggered.2

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Integrity The expected durability of a component or connection.2

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Internal Loss The ability of a material to absorb unnecessary vibration or resonance. If unchecked, this resonance produces distortion.4

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Inverter Takes the input signal and applies a 180º phase shift.4

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ISO-DIN Mounting Refers to a mounting system in which the headunit is mounted behind the dash panel with side brackets, employing factory installed trim panels.1

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Isolation Electrical or acoustical separation to prevent the spread of noise and the effect on the signal of unwanted elements produced by internal or external devices.4