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I-Mount ™

A proprietary tweeter mounting system used to simplify flush mount installation of tweeter in vehicles. This technology is found on JBL Reference and Kappa Tweeters.


Injection Molded Graphite cones material used in JBL Beta Series Drivers. This material injects carbon fiber in the cone in a special radial pattern improving cone stiffness.


Cone material made up of a blend of Polypropylene and graphite for stiffness, with a quartz silicate added for damping of unwanted resonances.


The sensation, provided by a well-designed, high-quality audio system, that the performers on the recording are actually performing in real space in front of the listeners.


The resistance of a device to the flow of alternating current. Often used to rate the resistance of a speaker's voice coil.

Inductive Coupling

Noise that is transmitted through a magnetic field to surrounding wires.

Inductor (Coil)

An electrical component which increases impedance with an increase in frequency. Often used in passive crossovers, inductors are rated in henries.

Infinite Baffle

A speaker mounted in a board with no side or rear panels. Also called "free-air." Technically speaking, a speaker can be considered infinite baffle if it is in a sealed enclosure that is larger than the Vas of the driver.


A design feature of JBL's GTi subwoofers that draws cooling air into the motor structure and vents out heated air.

Intermodulation Distortion

Distortion created by a device that is not harmonic with the original signal. Since it is not harmonics of the original signal, intermodulation distortion is often described as "harsh and grating," and tends to be more noticeable than harmonic distortion. Intermodulation distortion is often the result of poor amplifier design or the use of excessive amounts of negative feedback in the circuit. Systems that are fatiguing to listen to often have high rates of intermodulation distortion.


A speaker mounting system JBL has developed where a mounting ring is first fastened to the car and the speaker is fastened to the mounting bracket. This method not only allows for easier installation, but in the case of Intermount II, allows for the use of a larger cone in the speaker, creating added efficiency and bass response.

Intermount II

Is a mounting system that allows a single 6-1/2? speaker to fit into all four 6? hole standards. This is found on all JBL 6? models.


The mounting of two speakers in a way that will couple their output. This can be done by mounting the drivers in a back-to-front, or front-to-front (clamshell) arrangement with the drivers mounted out of phase with each other. This method of box construction allows the use of a smaller than normal box.