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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 of high frequencies while suppressing lower ones. The place in the frequency spectrum wher . . . View Full Definition

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 improved dynamic range and higher amp output power.

Horn: A type of speaker system now principally used for high-frequency reproduction, but which is capable of full range sound in its largest format. As with those huge alpine horns, even the small . . . View Full Definition

Horn Tweeter: A driver consisting of a relatively small emitter surmounted by a curvilinear or exponential horn. This is an effective system for radiating high frequencies in a variety of situations. The . . . View Full Definition

Hum Components: The residual artifact harmonics of the AC power supply. In the U.S. the use a 60-Hz system, places the most annoying 2nd and 3rd harmonics at 120 Hz and 180 Hz. For Europe, and other parts o . . . View Full Definition

Hyperbaric Resonator Impulse: An audible event characterized by a sudden and often unexpected pressure wave emanating from a vent port with a driver whose energetic and propulsive energy transitions, are generated by a p . . . View Full Definition

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 the listener to locate the instruments and vocalists as they were positioned during recordin . . . View Full Definition

Impedance: The totality measured in Ohms of all electrical opposition to current flow: resistance, reactance, capacitance, as well as all mechanical factors inhibiting the completion of energy transfer . . . View Full Definition

Inductive Coupling: Radiated noise that is transmitted through a magnetic field to surrounding lines. This frequently occurs in long runs owire where power and signal cables are in too close proximity. This is . . . View Full Definition

Inductor: A transformer, or an electrical component in which impedance increases as the frequency of the AC decreases. Also known as coils. In audio, these are used in passive crossovers. Inductors ar . . . View Full Definition

Infinite Baffle: An infinite baffle speaker design is defined as an enclosure that contains a greater volume of air than the Vas requirement of the driver. An infinite baffle system can easily be applied to . . . View Full Definition

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 affected by volume control settings and often occurs when mics are positioned too close t . . . View Full Definition

Input Sensitivity: Is the SPL (sound pressure level) a speaker will produce given one watt of power as measured from one meter away given a typical input frequency (usually 1khz unless otherwise noted on the s . . . View Full Definition

Input Voltage: The power voltage provided to an amplifier. While most cars can be expect to reliably produce 12 volts, amplifiers are sometimes measured at higher voltages; up to 15 volts. In this way, hig . . . View Full Definition

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