Glossary

C

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CMS

The mechanical compliance of a speaker suspension.

Capacitance

The property of a circuit element that permits it to store charge. The number of electrons (charge) it can hold under a given electrical pressure (voltage) is called its capacitance which is measured in farads, or fractions thereof, e.g. microfarads.

Capacitor

Two metallic surfaces separated by an insulator creating a device that can store an electric charge. It cannot pass DC and will pass AC signals with an impedance that decreases as frequency increases. This property makes capacitors useful in filter and crossover designs.

Cathode

The electrically negative terminal of a battery, or the electron source of a vacuum tube.

Ceramic Composite Tweeters

Extremely strong and lightweight making it ideal for use as a tweeter material. This material improves power handling while maintaining excellent efficiency.

Channel

A signal path. Stereo consists of two channels, starting from the signal source, and ending at the loudspeakers. Multichannel audio can have 5, 6 or 7 channels, plus a so-called .1 channel for low bass sound effects.

Chassis

The metal frame of a vehicle, or the metal base on which an electrical circuit is constructed.

Chebyshev Filter

A crossover that allows some signal ripple in the pass band but allows an attenuation slope that is steeper than a Butterworth design.

Clamshell

Operating two subwoofers face to face on the same baffle board and electrically out of phase with each other. A type of "compound loading," it allows a subwoofer to operate in a smaller box.

Clipping

A distorted signal generated by an amplifier that is being operated over its capabilities. Clipping describes the actual "cutting off" of signal peaks of an electrical signal at the amplifier's power limit. This is the sound often heard when a system is played too loud and the sound starts to "break up." Clipping distortion is the most common source of speaker damage.

Co-Injection Molded Woofer

A process by which the woofer's cone and surround materials are molecularly bonded together. This bond is much stronger than traditional glue and allows the woofer to reproduce tighter, deeper bass with significantly lower distortion than conventional woofers.

Common Sense Turn-on

The ability of amplifiers or outboard devices to be turned on by an incoming speaker-level signal.

Compliance

The volume of air in cubic feet that is equal to the compliance of the total suspension of a speaker.

Component Speaker System

Separating the units of a coaxial speaker into a tweeter and a woofer or midrange driver. This allows for better placement in a car environment, improving the stereo image.

Compound

Using two subwoofers coupled together in a small airspace. It allows a woofer to be used in a smaller enclosure. Compound loading can be done by clamshelling or positioning the woofers front to back.

Cone

The part of a speaker that moves.

Constant Bass

The ability of an active crossover to maintain a constant bass output regardless of the position of a system fader control.

Constant Directivity Horn

Proprietary horn design that smoothly and accurately reproduces high-frequency sounds throughout a much wider listening area.

Copper Polepiece Caps

Reduce magnetic eddy currents and extend high frequency performance.

Curvilinear Cone

A cone design pioneered by JBL that allows for better midrange and off-axis performance.