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an electrical signal. This type of mic requires
power from a battery or external source.
Control surface: Area on the control centre
that houses all of the user's hardware controls,
such as pushbuttons, control knobs, switches
etc.
Crossfade: To combine signals such that one
channel or source fades out while another fades
in, but maintaining an essentially constant
programme volume.
D zone: Section in the input channel strip for
controlling dynamic parameters.
D/A: Abbreviation for "digital to analogue". The
conversion of digital data to analogue audio.
Dashboard: A standard GUI screen display -
usually on the output bay - that shows all
channel meters (inputs, auxes, returns, masters
etc.) all of the time.
dB: Symbol for "decibel". A unit of
measurement of the loudness of sound. See
dBu.
dBu: A unit of measurement of sound used in
professional audio. Derived from the decibel,
where the "u" stands for unloaded, this unit is
an RMS measurement of voltage based on
0.775V
, which is the voltage at which you
RMS
get 1mV of power in a 600 ohm resistor. This
used to be the standard impedance in most
professional audio circuits.
Delay: An effect by which a reproduction of a
signal is played back later then its original.
DI: Abbreviation for "direct inject" or "direct
injection". Signal is plugged directly into audio
chain without using a microphone.
DI box: Device for matching signal level
impedance of a source to mixer input.
DSP: Abbreviation for "digital signal
processing". Any signal processing done after
an analogue audio signal has been converted
into digital audio. Can be used to create, for
example, compression, equalization etc., of a
digital signal.
E zone: Section in the input channel strip for
controlling EQ parameters.
Effect: One of a number of audio processes that
can be applied to a signal to modify it, such as
reverb, flanging, phasing, delay etc.
Effects rack: A virtual rack of internal
processors. See Virtual rack.
EQ: Abbreviation for "equaliser" or
"equalisation".
Equalisation: Adjusting the frequency response
so that the levels of all frequencies are equal or
the same. Bass and treble controls are
equalization controls.
Fader: Slider-type device for precise
adjustment of signal level or volume of a
channel.
Fast strip: One of the strips in the input, mix
and output fast zones. See Input fast strip,
Mix fast strip, Output fast strip and Fast
zone.
Fast zone: An area on a bay that contains quick
controls. See Input fast zone, Mix fast zone,
Output fast zone and Fast strip.
Filter: A device for removing frequencies above
or below certain levels.
FOH: Abbreviation for "front of house". The
area in a theatre used by the public. Used to
describe a control centre being used to control
the sound that the audience will hear (and not
the performers' monitor system).
Frequency: The number of times that a sound
wave's cycle repeats within one second.
Fricative: A consonant, such as "f" or "s",
produced by the forcing of breath through a
constricted passage.
Gain: Another term for signal level.
Gain reduction (compressor): Decrease in
gain when input signal is above threshold.
GEQ rack: A virtual rack of GEQs. See Virtual
rack.
Glide pad: Input bay device for GUI screen
navigation and control. See Input navigation
zone.
Graphic: A form of EQ that has a number of
faders for controlling the gain of the audio
signal. The faders are set at frequency bands
that are evenly-spaced according to octaves.
GUI: Abbreviation for "graphical user interface".
GUI channel strip: Right-hand section of a GUI
screen that represents the detail area of the
input or output channel strip selected to the
control surface.
GUI menu: A menu selectable at any GUI
screen by clicking on the "home" button (top
left-hand corner).
GUI screen: One of the XL8's five screens that
comprise the GUI.
HPF: Abbreviation for "high pass filter". A filter
that removes lower frequencies from a signal,
leaving the higher frequencies unaffected.
Hum: Undesirable low-frequency tone present
in a signal due to grounding problems or
proximity to a power source.
XL8 Control Centre
Operator Manual
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