Operator Manual

Glossary 556
PRO2 Live Audio System
Owner’s Manual
I/O: Abbreviation for “input/output”.
ID: Abbreviation for “identification”.
Ident: Scale marking, or gradation, around a
control knob to help indicate the current setting
and to assist in accurate adjustment.
Impedance (Z): Opposition to the flow of
alternating current in a circuit, measured in
ohms.
Input: 1. The signal being received by a device.
2. The physical location of where a device
receives a signal. 3. Concerning the input bays
on the PRO2 control surface.
IP: Abbreviation for “internet protocol”.
Principal network communications protocol.
K
k: Kilo- prefix symbol that represents 10
3
or one
thousand, for example, kHz (one thousand Hz)
or km (one thousand metres).
Kernel: For computers, the kernel is the central
component of most operating systems.
L
LCD: Abbreviation for “liquid crystal display”.
LCR: Abbreviation for “left-centre-right”,
referring to speakers.
LED: Abbreviation for “light emitting diode”.
Level: General term for volume or amplitude.
LF: Abbreviation for “low frequency”.
LFE: Abbreviation for “low frequency effects”. A
discrete channel intended for playback through
a subwoofer speaker, although it can be fed to
any speaker that can handle low frequency
signals. LFE is generally used to enhance sound
effects in films and is, typically, the “.1” in “5.1
surround”. LFE is not full bandwidth (range).
Examples of LFEs are: thunder, explosions and
other bass effects.
LHS: Abbreviation for “left-hand side”.
Limiter: An extreme form of compressor that
only affects signals above a selected threshold
level (dB).
Linux: Also known as “Linux kernel”. Operating
system kernel used by a family of Unix-like
operating systems. See kernel.
LPF: Abbreviation for “low pass filter”. A filter
that removes higher frequencies from a signal,
leaving the lower frequencies unaffected.
LS: Abbreviation for “left surround”. The left
rear speaker in a 5.1 surround system.
M
m: 1. Prefix symbol for “metre(s)”, for example,
as in “200 m” (200 metres); please note the
intermediate space. 2. Prefix symbol for milli-,
which represents 10
-3
or one thousandth, for
example, as in “2ms” (2 milliseconds); there is
no intermediate space.
MADI: Abbreviation for “multi-channel audio
digital interface”. An AES standard for digital
interconnection between multi-track recorders
and mixing consoles.
Main bus: A type of bus; see Bus.
Masters: The three master channels (mono and
stereo left and right) in the output bay.
MB: Abbreviation for “megabyte”.
MC: Abbreviation for “master controller”.
MCA: Abbreviation for “mix control associate”.
Meter: Visual device to indicate the level of a
signal.
Mic: Abbreviation for “microphone”.
Microphone: Device for converting sound
waves into audio signals.
MIDI: Acronym for “musical instrument digital
interface”. A digital signal system standard that
facilitates integration of musical instruments,
such as synthesizers and guitars, with
computers.
Mix: 1. A signal that contains a combination of
signals, such as a pair of stereo signals with
numerous effects. 2. The act of creating such a
combination. 3. A type of bus (see Bus).
4. Concerning the mix bay on the PRO2 control
surface.
Mixer: 1. A console or other device that blends
input signals into composite signals for output.
2. An engineer/technician who carries this out,
especially during a live performance.
mm: Symbol for “millimetre” (one thousandth
of a metre).
MON: Abbreviation for “monitor”, used to
describe a console/control centre being used to
mix the signals sent to the stage monitor
speakers.
Monitor: 1. Speaker(s) used for listening to a
mix or live audio. 2. The act of listening to a
mix or live audio. 3. Concerning the primary or
secondary monitor bus system, A or B
respectively.
Monitors: Control area on the master bay for
monitoring the A and B signal paths.