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Mobile Electronics Glossary of Terms and Definitions - V

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Glossary - V
  Vas - Compliance. A measurement in liters or cubic feet of the volume of air that is equal to the compliance of the speaker's total suspension.
  Vas/Cms - "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters. "Vas represents the volume of air that when compressed to one cubic meter exerts the same force as the compliance (Cms) of the suspension in a particular speaker. Vas is one of the trickiest parameters to measure because air pressure changes relative to humidity and temperature ó a precisely controlled lab environment is essential. Cms is measured in meters per Newton. Cms is the force exerted by the mechanical suspension of the speaker. It is simply a measurement of its stiffness. Considering stiffness (Cms), in conjunction with the Q parameters gives rise to the kind of subjective decisions made by car manufacturers when tuning cars between comfort to carry the president and precision to go racing. Think of the peaks and valleys of audio signals like a road surface then consider that the ideal speaker suspension is like car suspension that can traverse the rockiest terrain with race-car precision and sensitivity at the speed of a fighter plane. Itís quite a challenge because focusing on any one discipline tends to have a detrimental effect on the others. "
  Vb - Net enclosure volume.
  Vd - Maximum linear volume of displacement of the driver (product of Sd times Xmax), in cubic meters. "This parameter is the Peak Diaphragm Displacement Volume ó in other words the volume of air the cone will move. It is calculated by multipying Xmax (Voice Coil Overhang of the driver) by Sd (Surface area of the cone). Vd is noted in cc. The highest Vd figure is desirable for a sub-bass transducer."
  Voice Coil - Coil of wire wrapped around a tube and attached to the speaker cone or driver diaphragm. Becomes an electromagnet when an audio signal is applied and interacts with a permanent magnet which causes the cone or diaphragm to vibrate.
  Volt - The unit of measure for electrical potential.
  Voltage - he difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit.
  Voltage Drop - The amount of energy consumed when a device has resistance in its circuit. The voltage (E) set up across a resistance (R) carrying a current (I); E=IR
  VOM - Volt-Ohm-Meter. A multimeter that measures voltage, resistance (ohms), and amperes, milliamperes
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment

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