 list of audio terminology
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Impedance: Impedance is a measure of electrical resistance specified in ohms. Speakers are commonly listed as 4 or 8 ohms but speakers are reactive devices and a nominal 8 ohm speaker might measure from below 4 ohms to 60 or more ohms over its frequency range. This varying impedance curve is different for each speaker model and makes it impossible to design a really effective "generic" speaker level high-pass filter. Active devices like amplifiers typically have an input impedance between about 10,000-100,000 ohms and the impedance is the same regardless of frequency.
Inductance (L): The capability of a coil to store energy in a magnetic field surrounding it. It produces an impedance to an ac current. Inductors are commonly used in audio as low pass crossovers.
Infinite Baffle: A baffle that completely isolates the back wave of a driver from the front without a standard enclosure
Intercom: (intercommunication device) an electronic two-way communication system with at least one microphone and loudspeaker at each station for localized use. Utilizing a variety of microphone/speaker units that connect either wirelessly or via cable to a central control panel, individuals can use intercoms for a number of purposes. Most commonly intercoms are found in control and command applications including (but not limited to) warehouses and construction sites; film studios and theaters; and military commands and search and rescue operations.
IR (Infrared): IR refers to the section of the electromagnetic spectrum located between the red of visible light and the microwave bands (750 nm to 1 mm). IR wavelengths are used in the same way as radio waves for wireless connections between transmitters and receivers in audio systems. See More.
Infrasonic (Subsonic) Filter: A filter designed to remove extremely low frequency (25Hz or lower) noise from the audio signal. Useful for Ported box designs.
Interconnects: Cables that are used to connect components at a low signal level. Examples include CD player to receiver, pre-amplifier to amplifier, etc. Most interconnects use a shielded construction to prevent interference. Most audio interconnects use RCA connections although balanced interconnects use XLR connections.
Isobarik Enclosure: A trade name for a compound enclosure.
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Jitter: A tendency towards lack of synchronization caused by electrical changes. Technically the unexpected (and unwanted) phase shift of digital pulses over a transmission medium. A discrepancy between when a digital edge transition is supposed to occur and when it actually does occur - think of it as nervous digital, or maybe a digital analogy to wow and flutter.
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Kevlar: Material developed by Dupont that is has an exceptional strength to weight ratio. Used extensively in bullet-proof vests, skis, sailboat hulls, etc. In audio, used in many variations for speaker cones.
Kilohertz (kHz): One thousand hertz.
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