Crest Audio CENTURY LM, Manual

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LM
A
PPENDIX
B
C
ENTURY
S
ERIES
Input Fader Mix Switch
This switch activates circuitry that sums all input signals and
assigns the summed signal to the Monitor A output. This signal
is post fader.
Lamp Dim Control
Controls the brightness of any 12 volt lighting devices attached
to the XLR connectors on the light bar.
LINE Switch
Selects the input signal source between the Balanced XLR
Microphone Input connector and the Balanced Line Input 1/4"
TRS connector.
Line Input
This jack accepts balanced and unbalanced line level inputs
and delivers it into the associated input channel.
Microphone Input
This connector accepts balanced microphone inputs for the
associated input channel.
Microphone Output
This connector is in parallel with the Balanced Mic In connec-
tor and allows easy connection of the monitor board to the
FOH console.
Mix Sends
Every LM console has twelve (12) send controls. Each LM
model deals with these twelve controls differently:
LM-12 • Each of the twelve knobs determine the amount of
signal sent to each of the twelve outputs.
LM-8+4 • The first eight controls are dual concentric and they
determine the amount of signal sent to the first eight stereo
outputs. The center knob controls level while the outer knob is
a PAN control. The last four knobs adjust the level of signal
sent to outputs 9-12.
LM-20 • The first eight controls are dual concentric and they
determine the amount of signal sent to the first sixteen outputs
(1a/1b . . 8a/8b). The last four knobs adjust the level of signal
sent to outputs 9-12.
Monitor A/B
These are stereo local monitor outputs. Level is controlled via
the Monitor Level control and the signal is found on balanced
output connectors (two per monitor) on the rear of the master
section. Each Monitor can be muted with the Monitor Mute
switch. See - Input Fader Mix and Group Mix for more infor-
mation.
MUTE Switch with LED
On all inputs and outputs where this switch is present, depress-
ing it will mute all sends. This switch does not affect the PFL
switch or the Peak and Signal Present LED indicators, The
LED illuminates when the channel is muted either from the
switch or via the scene mute system.
Oscillator On
Switches on the internal (or external if connected) oscillator
which is fixed at 1kHz . The oscillator only operates when the
Talkback system is engaged.
Oscillator / Pink Noise In
This connector accepts a balanced or unbalanced signal from
an oscillator or pink noise generator. This signal is assignable
via the Talkback assignment switches. The external source is
switched in via the Oscillator On switch. The internal 1kHz
oscillator is defeated when a plug inserted.
Output Insert - See Insert
Output EQ - See Equalizer Controls (Output)
PAD Switch
Introduces a -15 dB drop to the mic input signal.
PEAK LED Indicator
Illuminates RED when any of the points monitored come with-
in 3db of the clipping point. Signal is sampled after the input
preamplifier stage, after the EQ section, and after the fader.
This LED also serves as a PFL ON indicator, but at a much
lower intensity than when it is used to indicate clipping.
PFL Indicator
This LED illuminates when the signal on meter 12 is a PFL or
AFL signal
Phantom Power Switch
Turns on 48V Phantom Power as required by certain micro-
phones for proper operation. This switch de48V only
when the Phantom Power Master Switch is engaged.
Phantom Master Switch w/LED
Sw48V phantom power on and off for the entire con-
sole.
Power Indicators
Shows the status of the four voltages used by the console.
Polarity Reverse Switch
Electrically inverts the polarity of associated signal.
PRE Switch
Toggles mix sends (in groups of four) between Post and the
internally selected Pre state. See the Internal Settings section of
the Technical Appendix.
PFL Switch
Samples the channel’s signal pre-fader and allows for monitor-
ing within the master section of the console. This signal is not
affected by the Mute Switch. When depressed, the signal level
can be seen on the output 12 meter, and heard via the mixer’s
headphone or local monitor output. When this PFL Switch is
depressed, the channel PEAK LED indicator illuminates at a
lower intensity. When used as a status indicator of switch posi-
tion, the Peak LED indicating circuit remains fully operation
by illuminating at a much higher intensity than its use as a PFL
status indicator. Input PFL always takes priority over output
PFL.