Page 1
CENTURY SERIES
LM
OWNER'S MANUAL
Page 2
Congratulations on your purchase of a Century Series console. All of us at Crest Audio in Paramus, New
Jersey, USA, support your decision, knowing your console contains the finest combination of design and
manufacture in the industry.
While your new Century Series console is one of the most feature-packed available, great effort has been
put into making it simple to operate.
This manual explains the functions of your new console, how they operate and how they relate to each
other. If properly cared for, your new console will provide you with trouble-free, sonically accurate mixing
clear into the next Century and beyond.
Please keep the following contact information on hand:
Crest Audio Customer Service Dept.
100 Eisenhower Drive
Paramus NJ 07652 USA
TEL 201.909.8700 FAX 201.909.8744
http://www.crestaudio.com
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Printed in USA
Page 3
TABLE OF CONTENTS
Feature Overview 2
LM
A brief description of the LM design, features and functions.
System Connections 3
LM
Contains diagrams illustrating conventional system connections.
Wiring Conventions 5
LM
Contains diagrams indicating how connectors for Crest consoles are wired.
Power Supply 6
LM
A description of the rack-mountable Century Series consoles power supply.
Power Connections 7
LM
A description of Crest console power connections.
Console Cooling 7
LM
A brief description of the dual-fan cooling setup.
LM-12 Input Module 8
LM
Profiles the LM-12 input module. The module is illustrated and described.
LM-20 (LM-8+4) Input Module 10
LM
Profiles the LM-20 (LM-8+4) input module. The module is illustrated and described.
LM-12 Output Module 13
LM
Profiles the LM-12 ouput module. The module is illustrated and described.
LM 8+4 Output Module 15
LM
Profiles the LM-8+4 output module. The module is illustrated and described.
LM-20 Output Module 17
LM
Profiles the LM-20 ouput module. The module is illustrated and described.
Master Module A 19
LM
Profiles the LM A-Master module. The module is illustrated and described.
Master Module B 21
LM
Profiles the LM B-Master module. The module is illustrated and described.
Technical Information Appendix A
LM
Includes dimensions, specifications, console access details,
user options, console block diagram, and rear panel layout.
Glossary Appendix B
LM
The specific details of console operation are described here, alphabetically.
Schematics Appendix C
LM
This appendix lists available LM console & power supply schematics.
PAGE 1
Page 4
LM
Feature Overview
The Century Series was designed to have all the features and
functions demanded by the modern music professional. The
engineers at Crest Audio have delivered the finest combination
of function and sonic accuracy in an affordable intuitive console. The features listed below are common to all Century
Series LM Consoles.
• SSM/PMI High quality devices on balanced
microphone/line inputs and on all outputs for uncompro-
mised audio quality and reliability. All IC’s within the audio
path are socket mounted for easy upgrade or service.
• The signal path is completely free of electrolytic capacitors and all internal audio connections are gold plated.
• Passive microphone splitters on every microphone input.
• 48 Volt switchable phantom power on all microphone
inputs.
• Optional transformers available on all microphone inputs
and primary outputs.
• Dynamic Signal Present and multiple-sample- point Peak
indicator LED’s are used on all input sections of the console
as well as on all primary outputs.
• Mono/Stereo PFL system. When a stereo module is used,
the signal is monitored in stereo while mono modules are monitored in mono.
• Standard frame sizes include 32, 40, 44, 52 and 64 module
positions. Any frame size may be ordered short loaded for later
expansion.
• The three banks of four rotary send controls each have an
associated Pre switch. This switch can be internally selected to
operate as pre EQ or pre Fader; this selection applies to all
three Pre switches on the module.
• Each of the twelve send controls can be internally selected
to operate in one of three modes: follow its associated Pre
switch, always Pre or always Post.
CENTURY SERIES
• Each LM output Module (except those in the master mod-
ule) has a ten-segment LED array, three-band sweepable EQ,
EQ-In switch, variable high-pass filter, polarity reverse, Insert
switch, Talkback enable, Dim, Peak & dynamic Signal Present
LEDs, local Mute and PFL.
• Return level controls provide signal from Returns 1 and 2
found on the Master section. The Sub Input controls deliver
signal from outputs 11 and 12 which are selectable pre or post
fader. This feature allows mixes 11 and 12 to be cross-mixed
to all other outputs.
• Comprehensive Talkback section allows access to all primary console outputs. External signals can also be assigned
into the talkback system.
• The basis of every Century console is signal integrity.
From the input preamplifier's impressive EIN of -129 dBu, to
completely balanced primary busing, the Century LM delivers
one of the cleanest signals available at any cost. This signal
purity comes from using only the highest quality components
in its innovative design. All inputs and outputs are electronically balanced, the primary inputs and outputs have the option of
transformer isolation.
• UL/CE-approved external power supply over-designed
with ample current reserves. For the ultimate in fail-safe reliability, a back-up power supply can be linked to the primary
supply with only an inexpensive jumper cable. External
switching is not needed.
• Mute system on input channels is designed to mute both pre
and post fader signals. When muted, PFL circuitry and, Peak
and Dynamic Signal Present LED indicators remain fully operational. This is a feature not available on many consoles at any
cost.
• Four scene (A-D) mute system
• The EQ section includes an EQ IN switch with LED and a
100Hz High Pass filter switch. The EQ itself offers four bands
(LF-40-800Hz, LMF-100Hz-2kHz, HMF-400Hz-8kHz, HF-
1.5k-20kHz) that are sweepable, providing full frequency control with generous overlap. The high and low frequency bands
are selectable between Peaking and Shelving via internal
jumpers.
PAGE 2
Page 5
CENTURY SERIES LM
LIVE MONITOR CONSOLE
System Connections
The console is the nerve center of a sound system and controls
most of the variables within a system. Proper connection and
component relationships are vital to assure accurate operation
and results. The following diagrams illustrate conventional system connections.
In
Signal Processors
Out
Insert Send/Return Connection
Front of House
Console
DIR OUT
DIR OUT
DIR OUT
DIR OUT
INSERT SEND
INSERT SEND
INSERT SEND
INSERT SEND
BAL INSERT RTN
BAL INSERT RTN
BAL INSERT RTN
BAL INSERT RTN
BAL LINE IN
BAL LINE IN
BAL LINE IN
BAL LINE IN
BAL MIC IN
BAL MIC IN
BAL MIC IN
BAL MIC IN
From
Stage
Microphones
Microphone Splitting
PAGE 3
Page 6
LM
CENTURY SERIES
Floor Wedge Connection
Clip/Limit
Signal
Temp/DC
Active
-6
-6
-10
-3
-10
-3
-15
-15
-1
-1
-30
-30
-80
0dB
-80
0dB
Ch A
Ch B
Clip/Limit
Signal
Temp/DC
Active
-6
-6
-10
-3
-10
-3
-15
-15
-1
-1
-30
-30
-80
0dB
-80
0dB
Ch A
Ch B
Receivers for
In-Ear Monitors
6001 Professional Power Amplifier
6001 Professional Power Amplifier
Stereo In-Ear Monitor Connection
PAGE 4
Transmitters for
In-Ear Monitors
Page 7
CENTURY SERIES
LM
Wiring Conventions
Since the same connectors are used throughout the professional audio industry, it is important to know how the connectors for
Crest’s Century Series are wired. The wiring is as follows.
INPUT XLR
1
3
2
PIN 1
PIN 3
PIN 2
PIN 1 = GROUND
PIN 2 = POSITIVE
PIN 3 = NEGATIVE
OUTPUT XLR
PIN 2
PIN 3
PIN 1
TIP - POSITIVE
RING - NEGATIVE
SLEEVE - GROUND
OUTPUT
Output Plug Polarities
INPUT
Input Plug Polarities
TIP - POSITIVE
RING - NEGATIVE
SLEEVE - GROUND
TIP - SEND
RING - RETURN
SLEEVE - GROUND
INSERT
Insert send & Insert return Polarities
PAGE 5
Page 8
LM
CENTURY SERIES
Power Supply
Century Series Consoles use a separate rack-mountable power supply which provides the specific voltages used by each console.
Century Consoles make use of two different power supplies. The model and frame size of your particular console determines
which of the two supplies should be used.
Model
LM
Press to Reset
ON
Supply Model XCVA04
Frame Size 24,32
C O N S O L E S
Power Supply
CAUTION
RISK OF ELECTRIC SHOCK
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á
DO NOT OPEN
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC
L'HUMIDITÉ
Designed & manufactured in the USA by:
A division of Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
1
2
3
4
5
7
6
Pin 1 +24V
Pin 2 +20V
Pin 3 Analog
Pin 4 Analog
Pin 5 Digital
Pin 6 +48V
Pin 7 -20V
POWER OUT
WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT
POWER OUT
Supply Identification
The type of power supply can be identified by the model number shown on the back of the chassis and panel label.
Power Requirements
The Century Series power supplies have certain electrical
requirements to operate properly. If possible the power supply
should be connected to a dedicated circuit. Should any other
appliance on the same circuit draw enough current to overload
the circuit, the breaker or fuse will trip causing loss of power
to the console. Note the maximum current draw specifications
at right. Be sure that the circuit to which you connect the supply can handle the draw.
The power switch on the supply front panel is also a circuit
breaker, there is no power fuse. Should the supply ever shut
down, or trip at start up, simply push the switch to the off position and then on again.
Ground Linking
Safety Considerations - Each new power supply is shipped
with the AC third wire ground connected to the console chassis
ground. The connection is made at the rear of the power supply
unit. This is necessary for safety reasons so that exposed metal
parts are grounded. In the event of a live conductor making
contact with the console chassis or the power supply chassis
then the current will flow to ground without a safety hazard
arising. Note that when the console is disconnected from the
power supply the chassis ground connection to AC third wire
ground is broken and safety protection is lost. For uninterruptible grounding, in a fixed installation for example, make a connection directly to the console chassis from the safety ground.
Disconnect the ground link on the rear of the power supply.
This disconnects console ground from power supply AC third
wire ground which would otherwise create a hum-loop.
Supply Model XCVA06
Frame Size 40,44,52,64
+20V
+48V
4A
MAXIMUM AC IN:
XCVA04: 415 WATTS
XCVA06: 825 WATTS
Model XCVA04
± 20V @ 4
+ 24V @ 4
+ 48V @ 1
+ 24V @ 6
S/N
± 20V @ 6
Model XCVA06
CONSOLE
GROUND
-20V
CHASSIS
GROUND
+24V
Twin Supply Operation
When twin supplies are in use for automatic back-up, then the
ground links on both supplies should be fitted. In a situation
where the safety ground to the console chassis has been connected and the ground path via the power supply is causing a
hum-loop, then disconnect the ground links on BOTH power
supplies.
Console and Power Supply Grounding
Console chassis ground is electrically connected to audio
ground, pin 1 of XLR connectors and 1/4" sockets and to the
terminal ‘CONSOLE GROUND’ at the rear of the power supply. The AC third wire connection in the power supply cable
connects the metal chassis of the power supply to safety
ground. This connection should never be disturbed. Hazardous
voltages exist inside the power supply which require the case
to be grounded. When rack-mounted, the power supply ground
may transfer to the rack case thru the front fixing screws,
though this connection is not reliable. When a console is configured within a complete sound system the grounding requirements may call for the ground link to be disconnected. This is
permissible only when an alternative ground path has been
provided. If in doubt seek the
advice of an experienced electrical engineer.
Power Supply Model
XCVA04
XCVA06
Model XCPS-40
S/N
±20V @ 4
+24V @ 4
+48V @ 1A
+24V @ 6A
±20V @ 6A
Model
XCVA06
Max Current Draw 120V/230V
7A/4A
9A/5A
PAGE 6
Page 9
CENTURY SERIES
LM
Power Connections
The connections to and from the power supply vary depending on your specific configuration. Multiple power supplies can be
daisy-chained to provide fail-safe protection in the event of a supply failure. When two or more supplies are used, they may be
connected to the same mains voltage since only one of the supplies will actually be feeding the console at any given time.
The connectors on the power supply are “smart” so that either one can be used as the console or interface connection.
To Console
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC
ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á
L'HUMIDITÉ
Designed & manufactured in the USA by:
A division of Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model XCVA04
S/N
± 20V @ 4
+ 24V @ 4
+ 48V @ 1
+ 24V @ 6
± 20V @ 6
Model XCVA06
CONSOLE
GROUND
CHASSIS
GROUND
MAXIMUM AC IN:
XCVA04: 415 WATTS
XCVA06: 825 WATTS
To AC Mains
1
2
4
5
6
7
Pin 1 +24V
Pin 2 +20V
Pin 3 Analog
Pin 4 Analog
Pin 5 Digital
Pin 6 +48V
Pin 7 -20V
POWER OUT
3
POWER OUT
Interface Cable
POWER OUT
1
2
3
4
5
6
7
Pin 1 +24V
Pin 2 +20V
Pin 3 Analog
Pin 4 Analog
Pin 5 Digital
Pin 6 +48V
Pin 7 -20V
POWER OUT
Console Cooling
A cooling fan configuration is included in all LM consoles except the LM-12 and the 32-chassis space LM Dual/Stereo models.
Two fans (one at each end of the console) draw air in through the sides of the chassis (under the sidebars). Air is distributed
through the chassis via a “vortex pan”, then proceeds up through the console modules, where the heated air exits the console
chassis.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR
WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC
ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á
L'HUMIDITÉ
Designed & manufactured in the USA by:
A division of Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model XCVA04
S/N
± 20V @ 4
+ 24V @ 4
+ 48V @ 1
+ 24V @ 6
± 20V @ 6
Model XCVA06
CONSOLE
GROUND
CHASSIS
GROUND
MAXIMUM AC IN:
XCVA04: 415 WATTS
XCVA06: 825 WATTS
To AC Mains
Once the console is powered up, cooling fans remain on. A rear panel switch permits the fans to be set at low, medium or high
speeds.
There are no filters to change or clean. As with any console, use in dusty/unclean environments should be avoided.
PAGE 7
Page 10
LM
3
CENTURY SERIES
7
8
2
9
1
10
+48V
10
20
63060
LINE
PAD
GAIN
100
ø
4
HF
10
3
2K
20K
1.5
HM
3
250
100
1K
400
100
2
2
1
2
1
2
2
2
1
2
2
400
150
40
PRE
5
46
3
1
0
5
4
3
0
5
4
3
0
5
46
3
1
0
PRE
5
4
3
1
0
5
46
3
0
5
46
3
1
0
5
46
3
1
0
8K
2K
3
800
EQ IN
10
6
10
6
10
10
6
10
10
10
10
6
LM
1
LF
6
1
7
8
9
2
7
8
9
3
7
8
9
4
7
8
9
5
7
8
9
6
7
8
9
7
7
8
9
8
7
8
9
0
46
3
2
1
0
4
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
PEAK
SIG
A
B
C
D
SAFE
SCENE
MUTE
SELECT
5
4
7
8
9
10
PRE
5
5
6
7
8
9
10
5
6
7
8
9
10
5
7
7
8
9
10
5
8
7
8
9
10
PRE
5
9
7
8
9
10
5
10
7
8
9
10
5
11
7
8
9
10
5
12
7
8
9
10
DIR OUT
INSRT SND
MUTE
PFL
BAL INSRT RTN
BAL LINE IN
LIFT
0
5
10
20
30
40
PIN 1
BAL MIC IN
BAL MIC OUT
PRE
5
9
46
3
7
2
8
LM-12 INPUT MODULE
The LM-12 input module is the primary input control for the LM12 monitor console. It differs from the LM-20 input module only
in the mix send section.
48V Phantom Power Switch
Turns on 48V Phantom Power as required by certain microphones
for proper operation.
LINE Switch
Selects between the Balanced XLR Microphone Input connector
and the Balanced Line Input 1/4" TRS connector.
PAD Switch
Introduces a -15 dB cut to the mic input signal.
GAIN Control
Adjusts input gain for proper signal level.
100Hz High Pass Switch
Reduces all low frequency content at a 12db per octave rate referenced to 100Hz (-3db point).
Polarity Reverse Switch
Inverts the polarity of both the microphone and line inputs.
Four-Band Sweep Equalizer Controls
There are two knobs for each of the four bands. The inner knob
controls the boost or cut; while the outer knob controls the center
frequency. These center frequencies are printed on the chassis
around the outer knob.
EQ IN Switch
Inserts the EQ section into the input channel signal. An associated
LED illuminates when the switch is down.
PRE Switch 1-4
Toggles mix sends 1-4 between Post and the internally selected
Pre state.
Mix Sends 1-4
Adjusts signal level sent to output mixes 1-4
PRE Switch 5-8
Toggles mix sends 5-8 between Post and the internally selected
Pre state.
Mix Sends 5-8
Adjusts signal level sent to output mixes 5-8
PRE Switch 9-12
Toggles mix sends 9-12 between Post and the internally selected
Pre state.
Mix Sends 9-12
Adjusts signal level sent to output mixes 9-12
MUTE Switch with LED
Mutes the channel and all sends except the insert send. 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 local mute switch or the scene mute system.
PAGE 8
Page 11
CENTURY SERIES
LM
PFL Switch
Samples the channel’s signal pre-fader and allows for monitoring 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 position, the Peak LED indicating circuit remains fully operational
by illuminating at a much higher intensity than when indicating PFL status.
PEAK LED Indicator
Illuminates RED when any of the points monitored come within 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.
SIGNAL PRESENT LED
This green LED constantly displays level activity of the input
channel by varying in intensity.
100mm Fader
Used for control of all outputs of the channel except those
sends selected pre fader. (The Insert Output level is not affected by the fader position.)
Rear Panel Connections
Direct Out
This 1/4-inch TRS jack carries the direct output signal (post
fader & post mute) from the associated input channel.
Insert Send
This 1/4-inch TRS jack carries the send signal of the insert
loop to the external effect or signal processor.
Balanced Insert Return
This 1/4-inch TRS jack accepts the return signal of the insert
loop from the external effect or signal processor back into the
console.
Balanced Line In
This 1/4-inch TRS jack accepts balanced and unbalanced line
level inputs and delivers it into the associated input channel.
Lift Pin 1
This ground lift switch may be used to isolate pin1 of the mic
XLR from console ground.
Unpressed = pin 1 grounded
Pressed = pin 1 lifted
Balanced Mic In
This XLR connector accepts balanced microphone inputs for
the associated input channel.
Scene Mute Assignments
Assign the input channel to any of the four scene mute groups.
Scene mute combines with the module’s local mute button, and
actuates the local mute LED.
Scene Mute Safe Switch
Disables any selected scene mute assignments. An associated
green LED indicates that the channel is in a safe state.
Balanced Mic Out
This XLR connector is in parallel with the Balanced Mic In
connector and allows easy connection of the monitor board to
the FOH console.
PAGE 9
Page 12
LM
7
3
CENTURY SERIES
1
0
5
46
3
1
0
PRE
5
4
3
1
0
5
46
3
1
0
5
46
3
1
0
5
46
3
1
0
PRE
5
46
3
2
1
0
5
46
3
2
1
0
5
46
3
2
1
0
5
46
3
2
1
0
PEAK
SIG
SAFE
10
10
6
10
10
10
10
10
10
10
10
MUTE
PFL
8
9
4
7
8
9
LM-20 (LM-8+4) INPUT MODULE
This module serves as the input module for LM-20 and the nowdiscontinued LM-8+4. The only difference between the two is
the factory default settings on the dual concentric sends.For the
LM-20 the sends are set for level/level operation. For an LM8+4 the sends are set for level/pan operation.
5
7
8
9
6
7
8
9
7
7
8
9
8
7
8
9
48V Phantom Power Switch
Turns on 48V Phantom Power as required by certain microphones for proper operation.
LINE Switch
Selects between the Balanced XLR Microphone Input connector
and the Balanced Line Input 1/4" TRS connector.
PAD Switch
Introduces a -15 dB cut to the mic input signal.
GAIN Control
Adjusts input gain for proper signal level.
100Hz High Pass Switch
9
7
8
9
10
7
8
9
11
7
8
9
12
7
8
9
DIR OUT
INSRT SND
BAL INSRT RTN
BAL LINE IN
Reduces all low frequency content at a 12db per octave rate referenced to 100Hz (-3db point).
Polarity Reverse Switch
Inverts the polarity of both the microphone and line inputs.
Four-Band Sweep Equalizer Controls
There are two knobs for each of the four bands. The inner knob
controls the boost or cut; while the outer knob controls the center frequency. These center frequencies are printed on the chassis around the outer knob.
EQ IN Switch
Inserts the EQ section into the input channel signal. An associated LED illuminates when the switch is down.
PRE Switch 1-4
Toggles mix sends 1-4 between Post and the internally selected
Pre state.
Mix Sends 1-4
Adjusts signal level sent to stereo output mixes 1-4 or mono
LIFT
0
5
10
PIN 1
BAL MIC IN
BAL MIC OUT
mixes 1a through 4b.
PRE Switch 5-8
Toggles mix sends 5-8 between Post and the internally selected
Pre state.
Mix Sends 5-8
Adjusts signal level sent to stereo output mixes 5-8 or mono
20
mixes 5a through 8b.
PRE Switch 9-12
30
40
Toggles mix sends 9-12 between Post and the internally selected
Pre state.
Mix Sends 9-12
Adjusts signal level sent to stereo output mixes 9-12 or mono
mixes 9a through 12b.
2
+48V
10
20
63060
LINE
PAD
GAIN
2
2
100
ø
2
4
HF
10
3
2K
1.5
1K
400
400
250
100
150
100
40
46
3
2
1
0
4
3
2
1
0
4
3
2
1
0
46
3
2
1
0
4
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
1
0
46
3
2
5
5
5
5
5
5
5
5
5
PRE
PRE
PRE
20K
3
EQ IN
10
6
10
6
10
10
6
10
10
10
10
HM
3
8K
1
2K
800
7
9
7
9
7
9
7
9
7
9
7
9
7
9
7
9
7
8
6
LM
LF
6
1
8
2
8
3
8
4
8
5
8
6
8
7
8
8
8
9
2
2
A
B
C
D
SCENE
MUTE
SELECT
PAGE 10
Page 13
CENTURY SERIES
LM
MUTE Switch with LED
Mutes the channel and 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 local mute switch or the scene mute system.
PFL Switch
Samples the channel’s signal pre-fader and allows for monitoring 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 position, the Peak LED indicating circuit remains fully operation
by illuminating at a much higher intensity than its use as a PFL
status indicator.
PEAK LED Indicator
Illuminates RED when any of the points monitored come within 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.
SIGNAL PRESENT LED
Constantly displays level activity of the input channel by varying in intensity.
100mm Fader
Used for control of all outputs of the channel except those Aux
output sections selected by switch to a pre fader position. (The
Insert Output level is not affected by the fader position.)
Rear Panel Connections
Direct Out
This 1/4-inch TRS jack carries the direct output signal (post
fader & post mute) from the associated input channel.
Insert Send
This 1/4-inch TRS jack carries the send signal of the insert
loop to the external effect or signal processor.
Balanced Insert Return
This 1/4-inch TRS jack accepts the return signal of the insert
loop from the external effect or signal processor back into the
console.
Balanced Line In
This 1/4-inch TRS jack accepts balanced and unbalanced line
level inputs and delivers it into the associated input channel.
Lift Pin 1
This ground lift switch may be used to isolate pin1 of the mic
XLR from console ground.
Unpressed = pin 1 grounded
Pressed = pin 1 lifted
Balanced Mic In
This XLR connector accepts balanced microphone inputs for
the associated input channel.
Balanced Mic Out
This XLR connector is in parallel with the Balanced Mic In
connector and allows easy connection of the monitor board to
the FOH console.
Scene Mute Assignments
Assign the input channel to any of the four scene mute groups.
Scene mute combines with the module’s local mute button, and
actuates the local mute LED.
Scene Mute Safe Switch
Disables any selected scene mute assignments. An associated
green LED indicates the channel is in a safe state.
PAGE 11
Page 14
LM
OUTPUT
+9
+6
+3
0
-3
-6
-9
-12
-15
-18
4
22040
RETURN
5
46
3
2
1
0
5
46
3
2
1
0
7
9
1
7
8
9
1
CENTURY SERIES
1
8
2
5
1
3
1
1
20
HF
O+
88
11
1
3
60
10
5
8
30
MID
O+
88
11
15
30
6
1
4
LF
O+
88
11
EQ IN
HPF
8
10
4
20
2
40
RETURN
5
46
7
8
9
0
1
5
46
7
8
9
0
1
SUB
INPUT
5
1
46
7
8
9
0
1
5
46
1
7
8
9
0
1
1
2
3
2
1
3
2
1
3
2
1
3
2
1
SUB
INPUT
5
46
3
2
1
0
5
46
3
2
1
0
PEAK
SIG
1
7
8
9
1
1
7
8
9
1
ø
INSERT
ON
TB ENB
DIM
MUTE
PFL
1
5
0
5
10
20
30
40
BAL OUT
INSERT SEND
INSERT RTN
PAGE 12
ø
Page 15
CENTURY SERIES
LM-12 Output Module
The LM-Mono Group output module is the primary output
module on the LM-12 and the secondary output module on the
LM-8+4 and the LM-20
LM
Output PEAK & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point.
Output Meter
Monitors the post-fader output signal via a ten-segment LED
array.
Output EQ
Controls the the equalization of the output mix signal through
three bands, via six controls. The upper knob of each band
determines the center frequency (high-1kHz-20kHz, mid300Hz-8kHz, low-40Hz, 1kHz), while the lower knob adjusts
the amount of boost or cut.
EQ IN Switch
Inserts the EQ section into the output channel signal. An associated LED illuminates when the switch is down.
High Pass Filter Switch
Inserts the High Pass Filter into the output signal.
HPF Frequency Control
This knob adjusts the high pass filter frequency from 20Hz to
400Hz. The filter operates at a -12 dB per octave rate.
Return Level Controls
Adjusts the level of return signals 1 and 2 in the output. These
signals come from the Master Section. See Returns 1 & 2 on
the Master Section description for more information.
The green LED constantly displays the level of signal activity
by varying in intensity.
Output Fader
Controls the final output signal level.
Rear Panel Connections
Balanced Out
This XLR connector carries the post-fader output signal from
the associated output module.
Output Insert Send
This 1/4-inch TRS balanced jack carries the send signal of the
output insert loop to the external effect or signal processor.
Output Insert Return
This 1/4-inch TRS balanced jack accepts the return signal of
the output insert loop from the external effect or signal processor.
Sub Input Controls
Adjusts the level of cross-mix in the output from mono outputs
11 and 12.
Polarity Reverse Switch
Inverts the polarity of the output.
Insert On Switch
Turns on the insert loop for the output signal. If a complete
insert loop is not present depressing this switch will mute the
output.
TB Enable Switch
Injects the talkback signal from the master section into the
group output.
DIM Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch, not momentary.
MUTE Switch with LED
Mutes the output. This switch does not affect the PFL switch
or the Peak and Signal Present LED indicators.
Output PFL
Enables Pre Fader Listening of the output signal. (this signal
can be internally selected post fader)
PAGE 13
Page 16
LM
100
CENTURY SERIES
40
OUTPUT
200
400
20
+9
+6
+3
0
-3
-6
-9
-12
-15
-18
5
10
3
15
1K
20K
HF
O+
88
16 16
1K
3
600
100
5
8K
300
MID
O+
88
16 16
150
300
6
1K
40
LF
O+
88
16 16
RETURN
5
46
3
2
1
0
5
46
3
2
1
0
SUB
INPUT
5
46
3
2
1
0
5
46
3
2
1
0
10
10
10
10
MONO
INSERT
TB ENB
1
7
8
9
2
7
8
9
11
7
8
9
12
7
8
9
Ø
ON
BAL OUT LEFT
DIM
EQ IN
80
40
20
RETURN
5
46
3
2
1
0
5
46
3
2
1
0
SUB
INPUT
5
46
3
2
1
0
5
46
3
2
1
0
100
400
10
10
10
10
MONO
HPF
MUTE
200
1
7
8
9
2
7
8
9
11
7
PFL
PEAK
SIG
5
0
5
10
20
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
8
9
12
7
8
9
30
40
PAGE 14
Ø
Page 17
CENTURY SERIES
LM-8+4 Output Module
The LM-Stereo group output module is the primary output
module on the discontinued LM-8+4.
Output Meters
Monitors the post-fader output signal via two ten-segment
LED arrays.
Output EQ
Controls the the equalization of the output mix signal through
three bands, via six controls. The upper knob of each band
determines the center frequency (high-1kHz-20kHz, mid300Hz-8kHz, low-40Hz, 1kHz), while the lower knob adjusts
the amount of boost or cut.
EQ IN Switch
Inserts the EQ section into the output channel signal. An associated LED illuminates when the switch is down.
High Pass Filter Switch
Inserts the High Pass Filter into the output signal.
HPF Frequency Control
This knob adjusts the high pass filter frequency from 20Hz to
400Hz. The filter operates at a -12 dB per octave rate.
Return Level Controls
Adjusts the level of return signals 1 and 2 in the output. These
signals come from the Master Section. The center knob adjusts
level while the outer knob adjusts panning within the stereo
image. See Returns 1 & 2 on the Master Section description for
more information.
LM
MUTE Switch with LED
Mutes the output. This switch does not affect the PFL switch
or the Peak and Signal Present LED indicators.
Output PFL
Enables Pre Fader Listening of the output signal. (this send can
be internally selected post fader)
Output PEAK & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point.
The green LED constantly displays the level of signal activity
by varying in intensity.
Output Fader
Controls the final output signal level
Rear Panel Connections (L & R)
Balanced Out
This XLR connector carries the post-fader output signal from
the associated output module.
Output Insert Send
This 1/4-inch TRS balanced jack carries the send signal of the
output insert loop to the external effect or signal processor.
Output Insert Return
This 1/4-inch TRS balanced jack accepts the return signal of
the output insert loop from the external effect or signal processor.
Sub Input Controls
Adjusts the level of cross-mix in the output from mono outputs
11 and 12. The center knob adjusts while the outer knob
adjusts panning within the stereo image.
Mono Switch
Depressing this switch mixes the left and right pre-insert signals together onto the Left Insert Send jack. The Left Insert
Return is switched to both Left and Right Returns. This allows
for a mono processor to be used, but affect both channels.
Polarity Reverse Switch
Inverts the polarity of the output.
Insert On Switch
Turns on the insert loop for the output signal. If a complete
insert loop is not present depressing this switch will mute the
output.
TB Enable Switch
Injects the talkback signal from the master section into the
group output.
DIM Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch, not momentary.
PAGE 15
Page 18
LM
CENTURY SERIES
OUTPUT
+9
+6
+3
0
-3
-6
-9
-12
-15
-18
5
10
3
15
1K
20K
HF
O+
88
16 16
1K
3
600
100
5
8K
300
MID
O+
88
16 16
150
300
6
1K
40
LF
O+
88
16 16
EQ IN
HPF
80
100
40
200
20
400
40
20
RETURN
5
46
3
2
1
0
5
46
3
2
1
0
SUB
INPUT
5
46
3
2
1
0
5
46
3
2
1
0
A
Ø
INSERT ON
TB ENB
DIM
PEAK
SIG
MUTE
PFL
200
400
1
7
8
9
10
2
7
8
9
10
11
7
8
9
10
12
7
8
9
10
B
BAL OUT LEFT
INSERT SEND
INSERT RETURN
PAGE 16
RETURN
5
46
3
2
1
0
5
46
3
2
1
0
SUB
INPUT
5
46
3
2
1
0
5
46
3
2
1
0
A
Ø
1
7
8
9
10
2
7
8
9
10
11
7
5
0
5
10
20
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
8
9
10
12
7
8
9
10
30
40
B
Page 19
CENTURY SERIES
LM-20 Output Module
The LM-Dual group output module is the primary output module on the LM-20.
Output Meter
Monitors the post-fader output signal via two ten-segment
LED arrays.
LM
Output PEAK & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point.
The green LED constantly displays the level of signal activity
by varying in intensity.
Output EQ
Controls the the equalization of the output mix signal through
three bands, via six controls. The upper knob of each band
determines the center frequency (high-1kHz-20kHz, mid300Hz-8kHz, low-40Hz, 1kHz), while the lower knob adjusts
the amount of gain or cut. This single set of knobs controls
both channels A & B.
EQ IN Switch
Inserts the EQ section into the output channel signal. An associated LED illuminates when the switch is down.
High Pass Filter Switch
Inserts the High Pass Filter into the output signal.
HPF Frequency Control
This knob adjusts the high pass filter frequency from 20Hz to
400Hz. The filter operates at a -12 dB per octave rate. This single knob controls both channels A & B.
Return Level Controls
Adjusts the level of return signals 1 and 2 in the output. These
signals come from the Master Section. The center knob adjusts
“level A” while the outer knob adjusts “level B.” See Returns 1
& 2 on the Master Section description for more information.
Output Faders
Controls the final output level of each signal (a & b).
Rear Panel Connections (L & R)
Balanced Out
This XLR connector carries the post-fader output signal from
the associated output module.
Output Insert Send
This 1/4-inch TRS balanced jack carries the send signal of the
output insert loop to the external effect or signal processor.
Output Insert Return
This 1/4-inch TRS balanced jack accepts the return signal of
the output insert loop from the external effect or signal processor.
Sub Input Controls
Adjusts the level of cross-mix in the output from mono outputs
11 and 12. The center knob adjusts “level a” while the outer
knob adjusts “level b.”
Polarity Reverse Switch
Inverts the polarity of the output.
Insert On Switch
Turns on the insert loop for the output signal. If a complete
insert loop is not present depressing this switch will mute the
output.
TB Enable Switch
Injects the talkback signal from the master section into the
group output.
DIM Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch, not momentary.
MUTE Switch with LED
Mutes the output. This switch does not affect the PFL switch
or the Peak and Signal Present LED indicators.
Output PFL
Enables Pre Fader Listening of the output signal. (This send
can be internally selected post fader)
PAGE 17
Page 20
LM
CENTURY SERIES
OUTPUT
BAL OUT
INSERT SEND
INSERT RTN
MONITOR A LEFT
MONITOR A RIGHT
EXT TB IN
PAGE 18
Page 21
CENTURY SERIES
LM
LM Master Module A
This the first of two modules that include master controls for
all LM consoles in addition to mono output eleven.
Output Meter
Monitors the post-fader output signal of group 11 via a tensegment LED array.
Monitor Level A
Adjusts the output level of local monitors A.
Monitor Mute A
Mutes local monitor A.
Sub 11 Post Switch
Switches the subgroup send between pre and post fader.
Sub 11 On Switch
Switches the subgroup send on and off.
Lamp Dim Control
Controls the brightness of any 12 volt lighting devices attached
to the XLR connectors on the light bar.
Power Indicators
Shows the status of the four voltages used by the console.
Phantom Master Switch w/LED
Switches +48V phantom power on and off for the entire console.
Input/Output PFL Indicators
These LEDs indicate what type of signal (input or output) is
PFL’d at any given time. Input PFL always gets priority over
output PFL.
Input Fader Mix Switch
Sums all input mixes and assigns the summed signal to the
Monitor A output. This output is stereo when stereo signals are
present. This signal is post fader.
Return Master Peak & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point. The green LED constantly displays the level of signal activity by varying in intensity.
Return Master PFL Switch
PFLs the return signal.
Output 11 Talkback Enable
Injects the talkback signal from the master section into the
group output.
Output 11 Dim Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch, not momentary.
Output 11 Mute Switch
Mutes the output. This switch does not affect the PFL switch
or the Peak and Signal Present LED indicators.
Output 11 PFL Switch
Enables Pre Fader Listening of the output signal. (This can be
internally selected to post fader)
Output 11 Peak & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point. The green LED constantly displays the level of signal activity by varying in intensity.
Output 11 100mm Faders
Controls the final signal level of outputs 11.
Rear Panel Connections
Output 11 Bal Out
This XLR connector carries the post-fader output signal from
the output group 11
Insert Send
This 1/4-inch TRS balanced jack carries the send signal of the
output insert loop to the external effect or signal processor.
Insert Return
This 1/4-inch TRS balanced jack accepts the return signal of
the output insert loop from the external effect or signal processor.
Monitor A Out (L&R)
These two connectors deliver local monitor A ‘s balanced output signal.
Oscillator / Pink Noise In
This 1/4-inch connector accepts a balanced or unbalanced signal from an oscillator or pink noise generator. This signal is
assignable via the talkback assignment switches.
Return Master Mute
Mutes the return signal
Return Master Level Controls
Controls the final return signal level.
Output 11 Polarity Reverse
Inverts the polarity of outputs 11.
Output 11 Insert On Switch
Turns on the insert loop for the output signal. If a complete
insert loop is not present depressing this switch will mute the
output.
PAGE 19
Page 22
LM
CENTURY SERIES
OUTPUT
BAL OUT
INSERT SEND
INSERT RTN
MONITOR B LEFT
MONITOR B RIGHT
OSC IN
PAGE 20
Page 23
CENTURY SERIES
LM Master Module B
This the second of two modules that include master controls
for all LM consoles in addition to mono output twelve.
Output Meter
Monitors the post-fader output signal of group 12 via a tensegment LED array. This meter also indicates PFL level.
PFL Indicator
This LED illuminates when the signal on meter 12 is a PFL or
AFL signal
Talkback Mic Input
Allows for connection of a gooseneck or other XLR type
microphone to the talkback system. Phantom power is available here for condenser mics.
Headphone Jack
Allows for connection of headphones via a 1/4" TRS plug.
Headphone Level Control
Controls the output level of both headphone jacks.
Group Mix Switch
Sums all output mixes and assigns the summed signal to the
Monitor B output. This output is stereo when stereo signals are
present. This signal is post fader.
Monitor Level B
Adjusts the output level of local monitor B.
Monitor Mute B
Mutes local monitor B.
Oscillator On
Switches on the internal 1kHz oscillator. The internal oscillator
only operates when the Talkback system is engaged.
External TB Input Switch
Adds an external signal to the internal talkback signal. This
signal is patched in via the external talkback connector on the
back of the master module.
Talkback Level Control
Adjusts the final level of all talkback signals.
External TB Output Switch
Feeds signal to the external talkback output connection. Only
the internal talkback signal is present at this connector.
Talkback Master On/Off
Switches the internal talkback system on and off
Sub 12 Post Switch
Switches the subgroup send between pre and post fader.
Sub 12 On Switch
Switches the subgroup send on and off.
LM
Output 12 Insert On Switch
Turns on the insert loop for the output signal. If an incomplete
insert loop is present, depressing this switch will mute the output
Output 12 Talkback Enable
Injects the talkback signal from the master section into the
group output.
Output 12 Dim Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch, not momentary.
Output 12 Mute Switch
Mutes the output. This switch does not affect the PFL switch
or the Peak and Signal Present LED indicators.
Output 12 PFL Switch
Enables Pre Fader Listening of the output signal. (This can be
internally selected to post fader)
Output 12 Peak & Signal LEDs
The red LED indicates that the output is within 3dB of the clipping point. The green LED constantly displays the level of signal activity by varying in intensity.
Output 12 100mm Fader
Controls the final signal level of outputs12.
Scene Mute Masters
These four switches turn the four scene mutes on and off for
the entire console.
Rear Panel Connections
Output 12 Bal Out
This XLR connector carries the post-fader output signal from
the output group 12.
Insert Send
This 1/4-inch TRS balanced jack carries the send signal of the
output insert loop to the external effect or signal processor.
Insert Return
This 1/4-inch TRS balanced jack accepts the return signal of
the output insert loop from the external effect or signal processor.
Monitor B Out (L&R)
These two connectors deliver local monitor B ‘s balanced output signal.
Ext. Talkback In
This connector accepts a balanced signal which is assignable to
any of the locations in the talkback system.
Output 12 Polarity Reverse
Inverts the polarity of output 12.
PAGE 21
Page 24
Page 25
LM
Appendix A
Technical
Information
Page 26
LM
CENTURY SERIES
Specifications
The following are the technical specifications for the Century
LM console.
Frequency Response
+0.0, -0.5dB, 20Hz to 20 kHz (referenced to 1kHz)
Total Harmonic Distortion
Mic input to Group output
20Hz to 20 kHz at +15dBu <0.01%
Noise (22Hz to 22kHz)
Mic EIN -129 dBu
Group Output Noise (20 ch routed)- 80 dBu
Crosstalk (Measured at 1kHz)
Channel Mute >102 dB
Channel Fader Attenuation > 96 dB
Channel Routing > 85 dB
Input/Output Impedances
Mic Input 4kΩ balanced
Line Input >10kΩ balanced
Outputs 140Ω balanced
Input/Output Levels (0VU = +4 dBu, 1.23V RMS)
Mic Input Sensitivity + 4 to -62 dBu
Line Input Sensitivity + 12 to -38 dBu
Input Insertion Point Level + 4 dBu
Output Insertion Point Level - 2 dBu
Nominal Output Level + 4 dBu
Maximum Balanced Output Level +28 dBu
Configurations
Century LM Consoles are available
in the following configurations:
LM-12 (12 mono outputs)
12, 20, 28, 32, 40, or 52 inputs
LM-20 (20 mono outputs)
12, 20, 28, 32, 40, or 52 inputs
Architect’s & Engineer’s
Specifications
The following text should be used when specifying a Century
LM in a bid or proposal.
The monitor console shall be constructed in a modular fashion
and be housed in a steel frame with molded plastic side
panel/carrying handles. The console shall be black with white
labeling and utilize XLR lighting device connectors. All
microphone inputs shall be electronically balanced and
accessed via 3-pin XLR connectors and have an EIN of -129
dBm. All line inputs shall be electronically balanced and
accessed via 1/4" TRS jacks. The insert points shall have discrete send and return connectors. Each input channel shall
have: a +48 volt phantom power switch, a -15 dB mic pad
switch, a 100Hz high pass filter switch, a polarity reverse
switch and 4-band (LF-40-800Hz, LMF-100Hz-2kHz, HMF400Hz-8kHz, HF-1.5k-20kHz) sweepable EQ with selectable
peak/shelve settings on the high and low controls and an EQ
In switch. Each input channel shall also have: a FET controlled (10 millisecond ramp) mute switch with LED, dynamic
signal present LED and peak LED, 4 scene mute switches (AD) each with LED, scene mute safe switch with LED and a
100mm long throw fader. Each input channel shall have output
send controls appropriate to the specified model. Each bank of
four rotary controls shall have an associated pre switch which
shall be internally elected to operate as pre EQ or pre Fader;
this selection shall apply to all three pre switches on the input.
Each of the send controls shall be internally selectable to operate in one of three modes: follow its associated pre switch,
always pre or always post. The console shall be available in
two output configurations: 12 mono or 20 mono. Each output
shall have a ten-segment LED array, three-band sweepable
EQ, EQ-In switch, variable high-pass filter, polarity reverse,
insert switch, talkback enable, dim, peak & dynamic signal
present LEDs, local mute and PFL. The mono outputs shall
have mono EQ, the stereo outputs shall have stereo EQ; while
the dual mono outputs shall have stereo EQ but with separate
A/B EQ In switches. The master section shall be contained
within mono outputs 11 and 12 and shall contain: a talkback
system, scene mute master controls, return master controls and
two stereo local monitor controls, connections for headphones,
talkback mics, external oscillators as well as indicators for
power, input and output PFL. The power supply shall be
housed in a 14 ga. steel chassis that shall occupy two 19" rack
spaces. The power supply shall have the ability to be daisychained to additional power supplies to provide a fail-safe
operating environment. Connection of two or more power supplies shall not require additional interface hardware other than
the provided cable.The live monitor console shall be: the Crest
Audio Century LM.
APPENDIX A
Page 27
LM
CENTURY SERIES
LM Block Diagram
CREST AUDIO
CENTURY LM BLOCK DIAGRAM
MONITOR A
MONITOR A
RIGHT
LEFT
M
M
GROUP PFL MIX R
MUTE
MONITOR A
LEVEL
FADER
INPUT
MIX
PFL
SW
INPUT PFL MIX R
GROUP PFL MIX L
∑
∑
∑
EXT TB IN
∑
1KHZ
OSC
PHONES
(FRONT)
OSC IN
EXT TB
OUT
GROUP PFL DC
INPUT PFL MIX L
(FRONT)
OUT
(TOP PANEL)
PHONES
INPUT FADER MIX
INPUT PFL DC
TB MIC
EXT TB
LEVEL
MIC PRE
PHONES
∑
(TOP PANEL)
TB MIC
GAIN
IN
+48v
20 30 40
OSC
EXT TB
LEVEL
TB
TB ON
+
GROUP MIX R∑GROUP MIX L
∑
MONITOR B
RIGHT
M
MONITOR B
LEFT
M
MONITOR B
LEVEL
MIX
GROUP
D
ROTARY
PIN 2 HOT ON ALL XLRS
USER OPTIONS IMPLEMENTED WITH REMOVABLE SHUNTS
POT PAD LED AMP
P
DIRECT OUT
INSERT RETURN
INSERT SEND
P
BAL MIC OUT
BAL LINE IN
P
S
BAL DRIVER
LEGENDS
SWITCH
PFL METER
GROUP 12
METER
--
MUTE
OPTION
PFL
SW
Ø
+
GROUP
MUTE
MUTE MASTERS
SCENE
B
C
A
OUT
XFORMER
DIM
TB
RETURN
INSERT
GROUP
12
Ø
FADER AMP
+10
M
INSERT
SEND
INSERT
ON
SUB 12
LEVEL
SUB
ON
POST
SUB
PRESENT
SIGNAL
PEAK
GROUP 12
MIX AMP
∑
LM GROUP 12 / MASTER B MODULE
CUE SELECT
POST
PRE
PFL
GROUP PFL DC
GROUP PFL R
GROUP PFL L
OPTION
USER
FADER
FET MUTE
M
ELVIS
E
FOR STEREO INPUT MODULES: FIRST 8
SENDS ARE DUAL-CONCENTRIC ROTARY
POTS. EACH OF THE EIGHT CAN BE
INDIVIDUALLY SELECTED BY INTERNAL
SWITCHES TO OPERATE IN STEREO
MODE (LEVEL/PAN) AS PER BLOCK A, OR
SET FOR DUAL-MONO OPERATION
(LEVEL/LEVEL) AS PER BLOCK B.
SELECT - EACH SEND:
FOLLOW SWITCH
ALWAYS POST
ALWAYS PRE
SENDS ARE SINGLE ROTARY POTS AS
PER BLOCK C.
9-12
PRE
X 4
ALL MODELS
9 THRU 12
SENDS
X 4
BLOCK C
FOR MONO INPUT MODULES: ALL 12
PRE
B
LEVEL
SOURCE
SELECT
PRE
PRE SOURCE AMP
5-8
LM20 SHOWN
5 THRU 8
SENDS
LEVEL
BLOCK B
A
PREAMP
INPUT
6 - 60DB
HPF
Ø
LF L MID H MID HF SHELFSHELF
FOUR BAND EQ
FREQ
M
+10
LM8+4 SHOWN
1 THRU 4
SENDS
BLOCK A
EQ IN
FADER AMP
PEAK
MUTE
EQ
FDR
NO YES
M
MUTE ?
PRE
PRE
1-4
X 4
LEVEL
PAN
R
L
BAL MIC IN
XFORMER
OPTION
GAIN
TO PEAK
LEVEL
INPUT PFL DC
SAFE MUTE SCENE SELECT
ABCD
PIN 1
LIFT
+48V
15dB
PAD
LINE
PRESENT
SIGNAL
LM INPUT MODULE
PFL
INPUT PFL
RIBBON CABLES
GROUP SELECT R(B)
GROUP PFL DC
GROUP PFL R
R GROUP
MIX AMP
∑
PFL
FOR DUAL MONO GRPS: EACH SIDE (A & B ) HAS INDEPENDENT SWITCHES
AND LEDS FOR EACH FUNCTION, DUAL FADERS & NO MONO SWITCH.
+
FOR STEREO GROUPS: FOR EACH FUNCTION: ONE SWITCH /LED CONTROLS
BOTH CHANNELS (L & R). SINGLE STEREO FADER.
POST
PRE
CUE SELECT
(SHOWN ABOVE)
HPF
HPF
RIGHT(B)
METER
RIGHT(B)
INSERT
SEND
CIRCUITS
EQ IN
THREE BAND EQ
(SHOWN ABOVE)
INSERT
ON
RIGHT(B)
TO COMMON
SIG & PEAK
RETURN
INSERT
GROUP PFL DC
GROUP PFL R
PRESENT
SIGNAL
POST
SUB
SUB
ON
SUB 11
LEVEL
SEND
∑
INSERT
GROUP PFL L
PFL
CUE SELECT
TB
LM GROUP 11 / MASTER A MODULE
DIM
GROUP
MUTE
Ø
XFORMER
OPTION
GROUP
METER
11
INPUTS
INPUTS
M
FADER AMP
+10
Ø
GROUP
OUT
MASTER
+48V
GROUP 11
MIX AMP
PEAK
PEAK
SIG
SIG
DIM
RTN 1
RTN 2
MUTE
MUTE
GROUP
MUTE
LEVEL
LEVEL
RTN 1
RTN 2
Ø
PFL 1
PFL 2
XFORMER
OPTION
RETURN
RETURN
2
1
PEAK
TB
M
FADER AMP
+10
Ø
INSERT
ON
RETURN
INSERT
GROUP
OUT
11
RETURN
(A)
SUB
(B)
LF MF HF
THREE BAND EQ
RETURN
INSERT
1211
12
GROUP SELECT
MIX AMP
GROUP
PEAK
PRESENT
SIGNAL
EQ IN
INSERT
ON
SEND
∑
+
HPF
INSERT
GROUP PFL DC
GROUP PFL R
GROUP PFL L
PFL
LM MONO GROUP MODULE
CUE SELECT
HPF
20 - 400HZ
METER
R FADER AMP
XFORMER
OPTION
RIGHT(B)
12(B)
INPUTS
SUB
TB
MONO
DIM
M
+10
GROUP
MUTE
Ø
Ø
XFORMER
OPTION
GROUP
OUT
LEFT(A)
OUT
11(A)
M
+10
Ø
GROUP
RETURN
INPUTS
2
THREE BAND EQ - RIGHT
THREE BAND EQ - LEFT
L FADER AMP
RETURN
LEFT(A)
INSERT
GROUP SELECT L
1
LEVEL PAN
MIX AMP
GROUP
L(A)
PEAK
PRESENT
EQ IN
LF MF HF
INSERT
ON
LEFT(A)
INSERT
SEND
MONO
SIGNAL
GROUP PFL L(A)
GROUP PFL DC
∑
+
CUE SELECT
LM DUAL MONO GROUP MODULE
POST
PRE
HPF
HPF
20 - 400HZ
LEFT(A)
METER
PFL
LM STEREO GROUP MODULE
APPENDIX A
Page 28
LM
CENTURY SERIES
The following diagram illustrates the depth and height dimen-
sions (from the side) for all Century LM consoles.
Console Side Dimensions
29.563" / 751mm
28.0"/ 711mm
2.25"/57mm
35°
2.375"/60mm
Crest Consoles Engineering,
All information per
May 5, 1997
KNOB HEIGHT 0.75"/19mm & 1.25"/32mm
29.625"/752mm
24.75"/ 717mm
10.25"/260mm
6.25"/159mm
1.125"/29mm
3.25"/83mm
APPENDIX A
241mm
9.5"
2.437"
62mm
Page 29
CENTURY SERIES
Console Rear Views and Dimensions
LM
A
DIR OUT DIR OUT DIR OUTDIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT
DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT DIR OUT
DIR OUT DIR OUT
DIR OUT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT LEFT
BAL OUT
BAL OUT
BAL OUT
BAL OUT
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
BAL INSRT RTN
INSRT SND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT SEND
INSERT RETURN
INSERT SEND
INSERT RETURN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
BAL MIC OUT
LIFT
PIN 1
BAL MIC IN
BAL LINE IN
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
INSERT RETURN
BAL OUT RIGHT
INSERT SEND
RETURN 2
RETURN 1
EXT TB OUT
MONITOR A LEFT
EXT TB IN
MONITOR A RIGHT
OSC IN
MONITOR B LEFT
MONITOR B RIGHT
Inputs
Outputs
Master Section
.75in.
19mm
Size A B
24 33.55" 31.80"
32 43.15" 41.40"
40 52.75" 51.00"
44 57.55" 55.80"
52 67.15" 65.40"
64 81.55" 79.80"
Size A B
24 852mm 808mm
32 1096mm 1052mm
40 1340mm 1295mm
44 1462mm 1417mm
52 1706mm 1661mm
64 2071mm 2027mm
Crest Consoles Engineering,
1.5in./38mm
May 5, 1997
B
APPENDIX A
Page 30
LM
CENTURY SERIES
LM USER-OPTIONS
LM Consoles are shipped having standard configuration unless specified at time of order There are ways that the console configuration may be varied after manufacture. The items listed are internal options selected by gold jumper links.
Default is marked with a line on the board and is usually pins 1&2 of the three pin header.
In addition there are links for module function assignment. Take care to not disturb these when using USER OPTION links.
MODULE LOCATION OPTION TITLE FUNCTION
M = Main
C = Connector
Shipped with the option underlined
All models
LM Inputs M Pre Source (SRC)Mute Aux sends with or without Mute
M Pre Source Select Pre & Post EQ
LM In EQ M HF PK-SH &LF PK-SH HF& LF Peak or Shelf EQ
LM Input C Mic Split Ground Connect or isolate Input pin 1 to Out pin 1
All models
LM Output 11(master A) M Monitor A Out PFL Source Stereo or Mono
LM Output 11 M Sub Send A Pre or Post group 11 Insert
LM Output 12 (master B) M Sub Send B Pre or Post group 12 Insert
LM Output 12 C Talkback Gain Low, Normal or High
LM Output 12 C Talkback Phantom Power On or Off
LM Stereo (8+4) models
LM8+4 In, send pots M Stereo or Dual Mono switch Level+Pan or Level+Level
LM8+4 In, send pots M Group Source Selects 1-12 Pre/Post fader or Switched
LM Stereo Groups M OPT 1 & 2 PFL or AFL Left & Right
LM Dual Mono (LM20) models
Inputs, send pots M Stereo or Dual Mono switch Level+Pan or Level+Level
Inputs, send pots M Group Source Selects 1-12 Pre/Post fader or Switched
LM Dual Mono Groups M Cue SEL opt 1 & 2 PFL or AFL A & B outputs
M CUE MODE opt 3 & 4 STR (stereo) or MONO
M SUB A & B (switch 16, 17) Level+Pan or Level+Level
M RET A & B (switch 18, 19) Level+Pan or Level+Level
LM12 models
LM 12 Outputs 1-10 M Cue, OPT 1 PFL or AFL
IMPORTANT
Output modules are pre-assigned at the Crest factory
These modules must always be installed in the correct positions. They are NOT interchangeable without being properly re-
assigned. Please contact the Crest Audio Service Department for more information.
APPENDIX A
Page 31
CENTURY SERIES
L
R
L
L
T
L
Console Disassembly
Though you shouldn’t have to disassemble the console, it is
necessary to remove modules to change the jumper and switch
settings associated with the internally selectable options.
ALWAYS DISCONNECT THE POWER SUPPLY
BEFORE OPENING THE CONSOLE!
ONE•Releasing the armrest.
To properly remove one or more modules, the black painted
armrest must first be released. To do this, the two thumbscrews (see diagram at right) must be loosened from below.
Once these screws are loose, slide both of them a few inches to the side (they will only move in one direction). Once
the screws have been moved the armrest will easily roll
back exposing the module screws beneath.
TWO•Remove top module screw
Once the armrest has been rolled back, a single screw holding each module in place will be exposed. Remove the
screws from the module(s) you want to remove.
LM
Opening the
Armrest
Thumbscrews
THREE•Remove rear screws
On the back panel of the console there are two screws holding each module in place (see diagram at right) Remove
both screws from each module you wish to remove.
FOUR•Lift the module(s) out
As you lift the module out of the chassis three wires must
be detatched before the module can be completely removed:
2 ribbon cables and one ground wire.
The ribbon cables are removed by flipping the latches on
the ends of the connectors. Once the latches have been
flipped the connector should pull off easily.
The ground wire (green) is a spade lug which will pull off
with a tug.
Lower Screw
Upper Screw
BAL OUT
INSERT SEND
INSERT RETURN
MONITOR A LEFT
MONITOR A RIGHT
EXT TB IN
BAL OUT
INSERT SEND
INSERT RETURN
RETURN 1
RETURN 2
EXT TB OUT
BAL OUT
INSERT SEND
INSERT RETURN
MONITOR B LEFT
MONITOR B RIGHT
OSC IN
BAL OUT
INSERT SEND
INSERT RETURN
Light Bar
BAL OUT LEFT
BAL OUT LEFT
INSERT SEND
INSERT SEND
INSERT RETURN
INSERT RETURN
BAL OUT RIGHT
BAL OUT RIGHT
INSERT SEND
INSERT SEND
INSERT RETURN
INSERT RETURN
DIR OUT
INSRT SND
BAL INSRT RTN
BAL LINE IN
LIFT
PIN 1
BAL MIC IN
BAL MIC OUT
FIVE•Putting it all back together
Re-assembling a Century LM is as easy as taking it apart, but only if you know where everything goes. If you are going to be
removing a number of modules, consider replacing the first before removing the second. Reversing the above steps will result in
the console being as well put together as it was when it left the factory.
Output modules are pre-assigned at the Crest factory
These modules must always be installed in the correct positions. They are NOT interchangeable without being properly re-
assigned. Please contact the Crest Audio Service Department for more information.
IMPORTANT
DIR
INS
BA
BA
LIF
PIN
BA
BA
APPENDIX A
Page 32
Page 33
LM
Appendix B
Glossary
Page 34
LM
CENTURY SERIES
Glossary
Balanced Insert Return
See Insert Return
Balanced Line In
See Line Input
Balanced Mic In
See Microphone Input
Balanced Mic Out
See Microphone Output
Balanced Out
See Outputs
DIM Switch
Introduces a -6dB drop to the output signal. This is a push
on/push off switch allows the operator to temporarily drop the
level of a monitor without actually changing any settings.
Direct Out
This jack carries the direct output signal (post fader & post
mute) from each input channel. This signal can be used for
connection to recording devices or routing of the post fader
signal.
EQ IN Switch
Inserts the EQ section into the input/output channel signal. An
associated LED illuminates when the switch is down.
Equalizer Controls (Input)
There are two knobs for each of the four bands. The inner knob
controls the boost or cut; while the outer knob controls the center frequency adjusted by the inner knob. These center frequencies are printed on the chassis around the outer knob. This EQ
is active only when the EQ In switch is depressed.
Equalizer Controls (Output)
Controls the equalization of the output mix signal through
three bands, via six controls. The upper knob of each band
determines the center frequency (high-1kHz-20kHz, mid300Hz-8kHz, low-40Hz, 1kHz), while the lower knob adjusts
the amount of boost or cut.
External Talkback Input
In addition to the mic connections on the console surface, an
additional Talkback input connection is provided on the rear of
the master section. Signal connected to this jack appears on the
Talkback bus whenever the External TB Input switch is
depressed.
External Talkback Output
This allows the internal TB signals present on the Talkback
bus to be routed to an external destination such as a link to the
FOH console. Signal appears on this jack when both the
External TB Output switch and talkback master switches are
depressed.
Fader
Used for final output control of an input/output channel except
those sends selected pre fader. (Insert Output levels are not
affected by the fader position.)
Gain Control
Adjusts input gain for proper signal level on the input. To set
the gain to the best position, make sure there is signal present
at the input. Depress the PFL switch on that input channel and
make sure that no other PFL switches are depressed. Adjust the
gain control until the PFL meter (on output module 12) is
peaking around the +3 level.
Group Mix Switch
This switch activates circuitry that sums all output mixes and
assigns the summed signal to the Monitor B output. This output is stereo when stereo signals are present. This signal is post
fader.
Headphone Jack
Allows for connection of headphones via a 1/4" TRS plug.
There are two headphone jacks: one on master module B, and
one underneath the armrest on the right front corner of the console.
Headphone Level Control
Controls the output level of both headphone jacks.
High Pass Filter Switch
This switch inserts the High Pass Filter into the output signal.
Unlike the 100Hz HPF on the inputs, the output HPF is
adjustable via the HPF frequency control.
HPF Frequency Control
This knob adjusts the high pass filter frequency from 20Hz to
400Hz. The filter operates at a -12 dB per octave rate.
100 Hz High Pass Filter (Input)
Reduces all Input signal low frequency content at a 12db per
octave rate referenced to 100Hz (-3db point).
Insert
All LM inputs and outputs have insert loops which facilitate
the patching of external processing equipment into the input or
output signal. All LM inserts are pre EQ.
On the inputs, signal is always present at the Insert Send connection and the loop is complete when the proper connector is
plugged into the Insert Return. The Insert Return can also be
used as a line input when by-passing the preamp is desired.
On the outputs, the loop is controlled by the Insert On switch.
Depressing this switch inserts the loop into the output signal.
Since this a true insert, if an incomplete loop exists, depressing
the switch will mute the output.
Input/Output PFL Indicators
These LEDs indicate what type of signal (input or output) is
PFL’d at any given time.
APPENDIX B
Page 35
CENTURY SERIES
LM
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 connector 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.
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 within 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 microphones for proper operation. This switch delivers +48V only
when the Phantom Power Master Switch is engaged.
Phantom Master Switch w/LED
Switches +48V phantom power on and off for the entire console.
Power Indicators
Shows the status of the four voltages used by the console.
Polarity Reverse Switch
Electrically inverts the polarity of associated signal.
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 information.
MUTE Switch with LED
On all inputs and outputs where this switch is present, depressing 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.
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 monitoring 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 position, 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.
APPENDIX B
Page 36
LM
Return 1/2
These connectors accept a balanced signal which is delivered
to the return master controls on the master section
Return Level Controls
Adjusts the level of return signals 1 and 2 in the output. These
signals come from the Master Section. The center knob adjusts
level while the outer knob adjusts panning within the stereo
image. See Returns 1 & 2 on the Master Section description for
more information.
Return Master Level Controls
Controls the final return signal level available to the outputs.
Scene Mute Assignments
Assign the input channel to any of the four scene mute groups.
Scene mute combines with the module’s local mute button, and
actuates the local mute LED.
Scene Mute Masters
These four switches turn the four scene mutes on and off for
the entire console.
Scene Mute Safe Switch
Disables any selected scene mute assignments. An associated
green LED indicates the channel is in a safe state.
CENTURY SERIES
Signal Present LED
This green LED constantly displays level activity of the
input/output channel by varying in intensity.
Sub Input Controls
Adjusts the level of cross-mix in the output from mono outputs
11 and 12. The center knob adjusts level while the outer knob
adjusts panning within the stereo image.
Sub 11/12 Post Switch
Switches the subgroup between pre and post fader.
Sub 11/12 On Switch
Switches the subgroup send on and off.
Talkback Master On/Off
Switches the internal Talkback system on and off
TB Enable Switch
Injects the talkback signal from the master section into the the
associated output.
Talkback Level Control
Adjusts the final level of all Talkback signals.
Talkback Mic Input
Allows for connection of a gooseneck or other XLR type
microphone to the Talkback system.
APPENDIX B
Page 37
LM
Appendix C
Schematics
LOCATION DESCRIPTION SCHEMATIC # DWG # REV #
LM 12 (MONO) INPUT MODULE LM 12 INPUT CONNECTOR 1 76D1753 03
LM 12 INPUT MAIN 2 76D1812 01
LM 20 / 8+4 INPUT MODULE LM 20 / 8+4 INPUT
CONNECTOR 3 76D1753 03
LM 20 / 8+4 INPUT MAIN 4 76D1830 01
MONO OUTPUT GROUP MODULE LM MONO OUTPUT
GROUP CONNECTOR 5 76D1824 02
"(LM 12 Groups 1-10, LM 8+4 & LM 20 Groups 9&10)" LM MONO GROUP MAIN 6 76D1823 02
STEREO / DUAL MONO OUTPUT GROUP MODULE LM DUAL MONO / STEREO
GROUP CONNECTOR (1 OF 2) 7 76D1832 02
(LM 20 & LM 8+4 Groups 1-8) LM DUAL MONO / STEREO
GROUP CONNECTOR (2 OF 2) 8 76D1832 02
LM 8+4 STEREO
GROUP MAIN (1 OF 2) 9 76D1831 02
LM 8+4 STEREO
GROUP MAIN (2 OF 2) 10 76D1831 02
LM 20 DUAL MONO
GROUP MAIN (1 OF 2) 11 76D1955 01
LM 20 DUAL MONO
GROUP MAIN (2 OF 2) 12 76D1955 01
MASTER A OUTPUT MODULE MASTER A CONNECTOR PCB 13 76D1826 01
MASTER A MAIN PCB 14 76D1825 01
MASTER B OUTPUT MODULE MASTER B CONNECTOR PCB 15 76D1829 01
MASTER B MAIN PCB 16 76D1828 01
RIBBON CABLE PIN OUT DIAGRAMS RIBBON PIN OUTS 17 n/a n/a
APPENDIX C
Page 38
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Printed in USA
*D7000002*
LM Owners Manual
Copyright © 1997 Crest Audio Inc.
v. 2.3 11/3/97 - D7000002
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