Technology / Home Audio Glossary

Dress: The arrangement of signal leads and wiring for optimum circuit operation, cosmetic appeal, and protective routing.

Driver: An alternate term for: speaker, transducer, or radiator. Properly speaking, the term speaker should refer to an entire sound producing system with whatever combination of woofer, midrange an . . . View Full Definition

Driver Volume: The amount of enclosure airspace that is displaced by the speaker itself.

Dual Voice Coil: A woofer with two voice coils mounted to a common cone, which can be connected to separate amplifiers, to produce a common bass output. Since bass has a non-directional character, this still . . . View Full Definition

Dual-Cone: Many factory installed auto speakers are of the dual cone type. Sometimes also referred to as a 'full-range' speaker, it uses an inexpensive, efficient design. The small 'whizzer' cone in th . . . View Full Definition

Dub: A copy or the process of making a copy of a recording on another storage device.

Dust Cover-Cap: A rigid cardboard or plastic dome placed over the opening to the voice coil cylinder in a dynamic cone driver. The main purpose is to prevent dust from falling into the voice coil-magnet gap . . . View Full Definition

Dynamic Range: The ratio of the loudest (undistorted) signal to that of the quietest (discernible) signal in a unit or system as expressed in decibels (db). Dynamic range is another way of stating the maxi . . . View Full Definition

Dynamic Range Suppression: A signal compression technique which raises the level of lower passages without affecting overall volume. Especially useful with high noise levels, such as a moving vehicle.

Dynamics: When used in music, refers to the varying degree of loudness and softness in a musical performance.

Earth: An electrical connection to the earth, which represents 0 volts or 'ground potential' by way of a metal or conductive rod.

Easter Egg: A surprise 'extra' coded into DVD's, computer programs or web pages that is accessed by an undocumented keystroke combination or hidden link.

Echo: The effect of a sound and a delayed version of that same sound. A 'Slap-Back Echo' is the original sound plus a single repeat; 'Multiple Echo' is the original sound plus several repeats with . . . View Full Definition

Effect: A device which modifies sonic structures creatively with various processing techniques.

Effective Piston Area (Sd): (measured in square inches or meters) The active radiating area of a speaker cone, including that part of the surround which displaces sufficient air to produce a measurable acoustic output.

Efficiency: The ability of an audio system to convert electrical energy (watts) into mechanical energy (Decibels of acoustical energy). This ratio is usually given as the amount of energy measured in De . . . View Full Definition

Efficiency Bandwidth Product (EBP): A parameter that helps determine the suitability of a driver for a sealed or ported enclosure. An EBP of less than 50 indicates the driver should be used in a sealed box, 50 - 90 indicates f . . . View Full Definition

Electrolytic Capacitor: A polarized capacitor with a negative and a positive terminal that is commonly used for DC power filtration and energy storage. As with all capacitors, the dielectic insulator separates two . . . View Full Definition

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