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AMPLIFIER
Used to power speakers
AMX (ANALOG MULTIPLEX)
A classification of control protocols which sends analog dimmer control signals serially down two wires. A common AMX protocal is AMX 192 which allows up to 192 dimmers to be controlled via a two wire control cable.
ANALOG or 0-10V CONTROL
A method of separating the control of the light into two halves. The low voltage half (Usually the controller) does not need to have any high voltages internally and so can be made intrinsically safe. Because the main switching is away from the controller the controller can be smaller. The controller is connected to either a switch or dimmer pack by control wires carrying signals from 0 to +10V, Where 0=Off, 5V=50% and 10V=full on.
ANALOG SIGNAL
A continuously variable signal that can have any value over a given range.
In lighting: an analog voltage within the range 0 to 10 Volts can have values of 0, 2, 8.785 or any value between. Most dimmers require an analog voltage in order to operate (from 0 to -10V or 0 to +10V depending on the manufacturer). Most lighting control desks produce a digital multiplexed output, which is converted by a demux box to an analog signal for the dimmer. Sound: An analog recording will record the exact waveform of the original sound, simply converting it to an electrical signal at the microphone, and back into air movement at the speaker.
ANGSTROM
Unit of measurement of length (e.g. for wavelengths of light). 1 Angstrom is equal to one ten billionth (1 x 10-10) of a metre.
ANSI / A.N.S.I.
American National Standards Institute. Three letter ANSI codes are used in the US to identify lamps.
ANTI PROSCENIUM
Originally Ante Proscenium, meaning in front of the proscenium.
APRON
Part of stage which protrudes past the proscenium towards the audience.
ARC DISCHARGE
An electrical discharge through an ionized gaseous atmosphere. Fluorescent and HID lamps are examples of light sources that use an arc to produce light.
ARC TUBE
An envelope, usually quartz or ceramic, that contains the arc of a discharge light source.
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