11
5 & 8-CHANNEL
MIXERS
L502 & L802 Owner's Manual
GLOSSARY OF TERMS
BALANCED
A 3-conductor (including shield), low-impedance connection.
Balanced cables are the preferred method for hum-free intercon-
nection of a sound system for their noise-rejection characteristics.
(Also see Unbalanced.)
BUSS
An output destination in a mixer. For example, the left and right
main outputs are called busses, because you can send a channel to
one or both of them. Also spelled Bus.
CHANNEL
One of any number of signal paths in an audio circuit, such as
input channel, output channel, recording channel, left channel, right
channel, etc.
DECIBEL (DB)
A term representing the ratio between different audio levels. It can
either refer to the electrical signal running through a channel or the
acoustic sound level coming from a sound source.
EQUALIZATION
Electronic filters that adjust the level of certain frequencies. Used for
tone enhancement or to reduce extraneous sounds. Two types of
EQ shapes are Peak and Shelving, described below.
IMPEDANCE
Resistance in an electrical circuit measured in Ohms (Ω). Main-
taining proper impedance (between amplifier and speakers for
example) is important to prevent damage to the amp.
PEAK EQUALIZER CONTROL
Increase or decrease of a frequency range centered at a specific
point, resulting in an EQ curve that looks like a hill (increase) or a
valley (decrease). (Compare to Shelving Equalizer Control; see
pages 8-9 for more information.)
PHANTOM POWER
A voltage signal that runs through a microphone cable to power
condenser microphones. Harmless to microphones that don't need
it, except for very old and/or damaged ribbon microphones.
REVERB
An audio effect that emulates the echo reflections and decay time
of a large space.
SHELVING EQUALIZER CONTROL
Increase or decrease of all frequencies above or below a specific
point. (Compare to Peak Equalizer Control; see pages 8-9 for more
information.)
TRS
Acronym for Tip-Ring-Sleeve — the three parts of a three-conductor
(including shield) audio plug. TRS phone plugs are often used for
“balanced” mono connections, or stereo "unbalanced" (head-
phone) connections.
TS
Acronym for Tip-Sleeve, the two parts of an unbalanced, two-
conductor (including shield) phone plug. TS connectors are some-
times called mono or unbalanced plugs or jacks.
UNBALANCED
A two-conductor (including shield), high-impedance connection.
These are most commonly used for instrument connections and
cable runs of less than 20 feet.
XLR
The three-pin connector universally used for balanced audio
connections. A balanced connection reduces outside noise and
interference. (See Balanced above.)
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