Vab - The volume of air having the same acoustic compliance as the enclosures.
Valence Electron - A negatively charged electron in the outer shell of an atom which can combine with other atoms to form molecules and electrical current flow. It is when negatively charged valence electrons leave conductive material atoms that they become “free electrons” and are attracted to the opposite polarity creating current flow.
Valet - A term used to describe the state in which a security system may be placed so that it would be prevented from arming passively and/or actively.
Valet Switch - The switch designed to provide the control to place the security system into or bring the system out of the valet state.
Variable Voltage Circuit - Refer to MUX
Vas - Also known as compliance, Vas is specified as the relative stiffness of a speaker suspension.
Vb - Net internal volume of an enclosure.
Vd - Maximum linear volume of displacement of the driver (this is the product of Sd multiplied by Xmax).
VDP - Refer to Video Distribution Profile
Vehicle Speed Sensor (VSS) - A discrete sensor on the vehicle that reports vehicle speed to the vehicle’s computer(s) and other speed dependent devices.
Vented Enclosure - Also known as Ported. A type of speaker enclosure that uses a duct or port to improve efficiency at low frequencies. Excellent design for lower power systems, as the port often adds up to +3 dB to low frequency efficiency. F3 can be set considerably lower with proper design, although low frequency roll-off is generally -24 dB/octave. Good transient response with proper tuning, although the driver loses damping below the tuning frequency. Excellent power handling about Fb, but source material or frequencies below Fb cause the driver to progressively perform as if it were not enclosed at all. Due to this, ported enclosures without a low frequency filter may have lower power handling compared to other designs. More difficult to properly build and tune than a sealed enclosure, with several "optimum" alignments available depending upon the Qts of the driver.
Very High Frequency (VHF) - This refers to frequencies between 30 and 300 MHz, which used to include analog TV channels 2-13.
Vf -The front volume of the bandpass enclosure.
VHF - Refer to Very High Frequency
Video Distribution Profile (VDP) – This profile allows the transport of video stream. The limitations for an in-vehicle application, which includes VDP, is that while transmitting/receiving video other supported Bluetooth profiles would not be available.
Voice Coil - A coil of wire that takes in the electrical energy coming from the amplifier and converts it into acoustic energy or mechanical motion.
Volt (E, V) - The term used to refer to the property of electrical pressure through a circuit.
Voltage - The electrical pressure required to do electrical work. Voltage is also caked potential. Voltage must be present for electrical current to flow within a closed circuit.
Voltage Drop - The amount of energy consumed when a dveice has resistance in its circuit. The voltage (E) measured across a resistance ® carrying a current (I). E= I x R.
Voltage Readout - A voltmeter, also known as a voltage meter, is an instrument used for measuring the potential difference, or voltage, between two points in an electrical or electronic circuit. Some voltmeters are intended for use in direct current (DC) circuits; others are designed for alternating current (AC) circuits.
Voltage Sensing - A name given o a form of alarm system trigger or remote starter input that relies on sensing a change in the voltage of the vehicle. Some remote starter systems rely on voltage sensing as an alternative to a tachometer input, for example.
Volume - The amount of space that a substance or object occupies, or that is enclosed within a container, especially when great. This can also mean the fluctuation of of the level of sound via a knob or buttons on a stereo.
Vr - The rear volume of a bandpass enclosure.
VSS - Refer to Variable Speed Sensor