Glossary - Intelix 8002MCB-XLR User Manual

MC Series

7.0 Glossary

Auxiliary Input - An additional (ninth) audio input channel. Unlike the other eight channels,
it only accepts balanced, line-level inputs. The auxiliary input has no volume control.
Balanced Line Input - Balanced, direct line level input to the summing junction that provides
an additional audio input source.
Compression Threshold - The volume level in dB which is set as the optimum device operat-
ing level, and above which the compressor/limiter begins to operate.
Compressor - A special type of limiting device which controls the total volume level of a
signal by compressing the part of the signal which exceeds a pre-determined threshold. The
threshold may be varied.
Gain/Trim Control - Trim is the adjustment of the gain of the input stage to offset the differ-
ences between input signal levels. Gain is the ratio between the input and output signal levels
Ground Loop - A condition which can occur when several ground pathways exist between
two or more devices and which can cause hum in the audio signal.
Jumper - A short length of conductor used to connect pins electrically.
Limiter - A device that severely (at rates greater than 20:1) restricts the upper dynamic range
of a signal, by regulating the rate of increase of an input signal's amplitude so that it will not
exceed a predetermined threshold.
Line/Microphone Level - The two signal level ranges at which the mixer accepts input. Mic
level is usually -50 dBu and line level is usually +4 dBu
Low Cut Switch- Removes the lower-frequency (<150 Hz) components, which cause rumble,
from a signal.
Phantom Power - A method of powering condenser microphones by sending DC current
over the same mic cable that carries the audio signal. Called "Phantom" as there is no visible
power cord and the voltage is not perceptible in the audio signal.
Signal Clip LED - On the MC mixers, the indicator that lights (red) when the input signal to
a channel is greater than +18 dB.
Signal Present LED - On the MC mixers, the indicator that lights (green) when the input
signal to a channel is at least -10 dB.
Summing Junction - The point in the MC circuitry where the audio signals are mixed.
XLR - Rugged, locking, multi-pin balanced connectors frequently used to terminate cables.
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