Crest audio LMX OWNER'S MANUAL
CENTURY SERIES
LMx
OWNER’S MANUAL
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
TABLE OF CONTENTS
Feature Overview 2
LMx
A brief description of the LMx design, features and functions.
System Connections 3
LMx
Contains diagrams illustrating conventional system connections.
Wiring Conventions 5
LMx
Contains diagrams indicating how connectors for Crest consoles are wired.
Power Supply 6
LMx
A brief description of the rack-mountable Century Series consoles power supply.
Power Connections 7
LMx
A brief description of Crest console power connections.
Console Cooling 7
LMx
A brief description of the dual-fan cooling setup.
Input Module 8
LMx
Profiles the LMx input module.
The module and rear panel are illustrated and described.
Group Module 10
LMx
Profiles the LMx group module.
The module and rear panel are illustrated, and described.
Stereo 21R/22L Module 12
LMx
Profiles the LMx console stereo 21R/22L module.
The module and rear panel are illustrated, and described.
Master Module 14
LMx
Profiles the LMx console master module.
The module and rear panel are illustrated, and described.
Meter Bridge 16
LMx
This section profiles the LMx meter bridge.
Each type of meter is illustrated and described.
Operation 18
LMx
Describes special features: Global Level/Pan, Solo system, Monitor outputs,
Stereo Input, Channel Input Mic split, Line Inputs, Sub-grouping.
Technical Information Appendix A
LMx
Includes dimensions, specifications, console access details,
user options, console block diagram, and rear panel layout.
Glossary Appendix B
LMx
The specific details of console operation are described here, alphabetically.
Schematics Appendix C
LMx
Lists available LMx console and power supply schematics.
PAGE 1
LMX
Feature Overview
• 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.
• A signal path completely free of electrolytic capacitors; all
internal audio connections are gold plated.
• Pad switches on XLR inputs allow preamplifiers to accept
signals from -62 to +7 dBu on mic and -44 to +10 dBu line.
• Separate 1/4" insert send and return jacks are provided for
patching outboard equipment.
• Passive microphone splitters with ground lift switches on
every microphone input.
• Switchable 48 Volt phantom power on all microphone
inputs; optional transformers available on all microphone
inputs and primary outputs.
• EQ section includes an EQ ON switch with LED and a
100Hz High Pass filter switch. Four sweepable bands (LF-40800Hz, LMF-100Hz-2kHz, HMF-400Hz-8kHz, HF-1.5k20kHz) are supplied with bell curves, providing full frequency
control with generous overlap. The HF and LF bands are selectable between Peaking and Shelving via internal jumpers.
• 5-LED display on input modules, logically placed next to
the fader, provides accurate monitoring of pre-fader input levels.
• Input channels have level sends for the 22 output buses,
with dual concentric controls provided for buses 1-16 and single controls for buses 18-20 and 21L/22R. These controls may
function as either 11 stereo sends with level and pan, 22 discrete mono sends, or any desired combination of the two
modes. Global mono or stereo configuration for each bus is
determined by pushing a single button on the corresponding
output module.
• FET-controlled “soft” Mute switches on each input mod-
ule, which cut every selected send and output. Each input may
be assigned to any or all of the eight Mute Groups, and assignments are clearly indicated by associated status LEDs.
Engaging the Safe switch defeats the module’s group mute
function without changing the console setup.
• Output EQ - Each of the Group Output modules incorporates a dedicated stereo EQ section with three overlapping
swept bands (40Hz - 1kHz, 300Hz - 8kHz, 1kHz - 20kHz ),
odd & even EQ In/Out switching with status LEDs, and
switchable High Pass Filters with a corner frequency sweepable from 20Hz to 400Hz.
• Input for Room Ambience Microphones - Dedicated Stereo
Mic Input section (located on the upper part of the Stereo
21L/22R output module), allows routing of room ambience
microphones to in-ear monitoring systems. Includes a lownoise dual preamplifier with gain control, pad, polarity reverse
switch, phantom power switch, mic/line input switch, stereo
input EQ section with two overlapping swept bands, EQ in/out
switching, and a 100Hz roll-off High Pass Filter.
CENTURY SERIES
During quieter pauses between performances, an integrated
compressor-gate automatically opens the room ambience
microphones. When the performance resumes, the auto-control
processor gradually engages compression over a wide range,
smoothly reducing ambience level in proportion to the increase
in stage sound until mics are gated off at nominal performance
level. All eleven output modules have individual dual concentric level controls (switchable for mono or stereo mode) to feed
the Stereo Mic inputs into the Monitor outputs.
• The L/R to Group section, located on each Group Output
module, can be used to re-matrix the 21L/22R output’s mix
back into any or all of the other ten stereo or twenty mono outputs. A second subgroup feature allows any or all signals on
the first 20 mono/10 stereo buses to be assigned to the L/R
Master module, providing the flexibility required for alternate
use as an FOH console. The two subgroup modes are interlocked to prevent inadvertent feedback loops.
• Line In with Level controls, On/Off switching and Solo
switching on each of the ten Group Output modules. The line
inputs can be used as summing inputs or simple effects returns.
• Full-size meter bridge with large, sunlight-visible mechani-
cal VU meters. Metering provided for all 22 output buses plus
the stereo solo bus. Meters are solid state LED illuminated.
• Master Section provides a full bandwidth (20Hz - 20kHz)
oscillator, pink noise generator, headphone output level control, monitor on/off switch, and Talkback functions. A 100mm
fader is featured for main monitor level. Adjoining the fader
are switches to select monitor source. Source options are either
external stereo, or summing of the monitor output to mono,
and selecting a mix of all input faders for routing to the monitor output.
• A Volume Foot Pedal (and rear panel connection jack) are
provided. The foot pedal connects in series with the Monitor
Output fader.
• Comprehensive, logic-controlled Solo system.
- Normal and input priority modes
- Choice of summing and ‘last pressed’ mode
- Choice of PFL and AFL audio in stereo
• 52 and 64 module position frames, constructed of pre-plated 14-gauge steel. Any frame size may be ordered short loaded
for later expansion.
• 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.
PAGE 2
CENTURY SERIES
LEFT
MONITOR
RT
SND
INSERT
BAL
RTN
LEFT
ALT MON
RT
EVEN
LMX
System Connections
Proper connection and component relationships are vital to
assure accurate operation and results. The following diagrams
illustrate conventional system connections.
ODD
ODD
OUT
ODD
OUT
SND
SND
INSERT
INSERT
BAL
BAL
TRN
TRN
EVEN
OUT
OUT
ODD
OUT
OUT
SND
SND
INSERT
INSERT
BAL
BAL
TRN
TRN
EVEN
EVEN
OUT
OUT
IN
BAL
MIC
OUT
EXT TB
Master
SND
IN
INSERT
OUT
BAL
RTN
STR
STR
MIC
MIC
IN
IN
L
R
L / R
SND
INSERT
BAL
RTN
SND
INSERT
BAL
RTN
SND
INSERT
BAL
RTN
Floor Wedge Connection
ODD
ODD
OUT
OUT
SND
SND
INSERT
INSERT
BAL
BAL
TRN
TRN
EVEN
EVEN
OUT
OUT
LEFT
ALT MON
RT
MONITOR
ODD
OUT
ODD
LEFT
OUT
RT
SND
INSERT
BAL
RTN
SND
SND
INSERT
INSERT
BAL
BAL
TRN
TRN
EVEN
EVEN
OUT
OUT
SND
INSERT
BAL
RTN
-6
-10
-15
-30
-80
Ch A
-6
-10
-15
-30
-80
Ch A
Receivers for
In-Ear Monitors
6001
Clip/Limit
Signal
Temp/DC
Active
-6
-3
-10
-3
-15
-1
-1
-30
0dB
-80
0dB
Ch B
Clip/Limit
Signal
Temp/DC
Active
-6
-3
-10
-3
-15
-1
-1
-30
0dB
-80
0dB
Ch B
Professional Power Amplifier
6001
Professional Power Amplifier
SND
IN
EXT TB
INSERT
OUT
BAL
RTN
IN
BAL
MIC
STR
-
MIC
OUT
IN
L
SND
SND
INSERT
INSERT
BAL
BAL
RTN
RTN
STR
MIC
IN
R
SND
SND
INSERT
INSERT
BAL
BAL
RTN
RTN
Transmitters for
In-Ear Monitors
L / R
Master
Stereo In-Ear Monitor Connection
PAGE 3
LMX
System Connections (cont'd)
In
DIR
OUT
SND
INSERT
BAL
RTN
LINE IN
BAL
DIR
OUT
SND
INSERT
BAL
RTN
LINE IN
BAL
DIR
OUT
SND
INSERT
BAL
RTN
LINE IN
BAL
DIR
OUT
SND
INSERT
BAL
RTN
LINE IN
BAL
CENTURY SERIES
DIR
OUT
SND
INSERT
BAL
RTN
LINE IN
BAL
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
PIN 1
PIN 1
PIN 1
PIN 1
LIFT
LIFT
LIFT
IN
IN
BAL
MIC
OUT
ODD
OUT
DIR
DIR
DIR
OUT
OUT
SND
SND
INSERT
BAL
TRN
SND
INSERT
BAL
RTN
SND
INSERT
INSERT
BAL
BAL
RTN
RTN
LINE IN
LINE IN
EVEN
BAL
BAL
OUT
PIN 1
PIN 1
LIFT
LIFT
IN
BAL
MIC
OUT
DIR
OUT
OUT
SND
SND
INSERT
INSERT
BAL
BAL
RTN
RTN
LINE IN
LINE IN
BAL
BAL
PIN 1
PIN 1
LIFT
LIFT
IN
IN
-
-
BAL
BAL
MIC
MIC
-
-
OUT
OUT
IN
-
-
BAL
BAL
MIC
MIC
-
-
OUT
OUT
Microphones
PIN 1
LIFT
LIFT
IN
IN
-
-
BAL
BAL
MIC
MIC
-
-
OUT
OUT
From Stage
Microphone Splitting
PAGE 4
CENTURY SERIES
LMX
Wiring Conventions
Since the same connectors are used throughout the professional audio industry, it is important
to know how the connectors for Crest consoles are wired. Wiring is as follows:
INPUT XLR
PIN 1
1
PIN 3
3
PIN 2
2
PIN 1 = GROUND
PIN 2 = POSITIVE
PIN 3 = NEGATIVE
TIP - POSITIVE
RING - NEGATIVE
SLEEVE - GROUND
OUTPUT XLR
PIN 2
PIN 3
PIN 1
INPUT
Input / Return Plug Polarities
OUTPUT
Output / Send Plug Polarities
TIP - POSITIVE
RING - NEGATIVE
SLEEVE - GROUND
TIP - LEFT
RING - RIGHT
SLEEVE - COMMON
Headphone
Connector: Headphone Output
PAGE 5
LMX
CENTURY SERIES
Century Series Console Power Supply
Century Series consoles use a separate rack-mountable power supply which provides the specific voltages used by each console.
Crest Audio’ Century Series makes use of two different power supplies. Both frame sizes (52 & 64 space) of the LMx console
should only be used with the Model XCVA06 Power Supply.
Press to Reset
ON
C O N S O L E S
Power Supply
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
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
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.
+20V
+48V
Model XCVA04
S/N
± 20V @ 4
+ 24V @ 4
+ 48V @ 1
+ 24V @ 6
± 20V @ 6
Model XCVA06
CONSOLE
GROUND
-20V
CHASSIS
GROUND
+24V
MAXIMUM AC IN:
XCVA04: 415 WATTS
XCVA06: 825 WATTS
6A
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.
Serial Number Tag
Model Number
Power Supply
Model
Max
Current
Draw @ 120V
S/N
Model XCPS-40
±20V @ 4
+24V @ 4
+48V @ 1A
+24V @ 6A
±20V @ 6A
XCVA06
Model
Max Current
Draw @ 240V
PAGE 6
XCVA06
9 Amps
5 Amps
CENTURY SERIES
LMX
Power Connections
The LMx’s UL/CE-approved power supply is over-designed with ample current reserves. Multiple power supplies can be daisychained to provide fail-safe protection in the event of a supply failure. For the ultimate in fail-safe reliability, a back-up power
supply can be linked to the primary supply with only a jumper cable. External switching is not needed. Both power supplies run
all the time. In the event of supply failure, the remaining power supply(s) will take over the entire load.
Also, should a console module be accidentally disabled, the LMx power supply is designed to ignore that one module, keeping
the rest of the board fully operational.
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 LMx consoles. 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.
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.
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
There are no filters to change or clean. As with any console, use in dusty/unclean environments should be avoided.
PAGE 7
LMX
CENTURY SERIES
Ø
EQ ON
1K
250
100
L
R
L
R
PAN
1K5
400
100
2
2
2
2
2
2
2
2
30
3
400
150
40
3
1
3
1
3
1
3
1
3
1
3
1
3
1
3
1
3
2
1
3
2
1
3
2
1
LINEPAD
+48
40
GAIN
205070
100
4
10
20K
2
3K
6K
8K
1K
2K
300
600
800
PRE
5
46
7
8
9
10
0
5
46
7
8
9
10
0
5
46
7
8
9
10
0
5
46
7
8
9
10
0
PRE
5
46
7
8
9
10
0
5
46
7
8
9
10
0
5
46
7
8
9
10
0
5
46
7
8
9
10
0
PRE
5
46
7
8
9
10
0
5
46
7
8
9
10
0
5
46
7
8
9
10
0
HM
LM
10
11
12
13
14
15
16
17
18
19
9
5
46
10
7
3
1
0
5
46
3
1
0
5
46
3
1
0
5
46
3
1
0
PRE
5
46
3
2
1
10
0
5
46
3
2
1
10
0
5
46
3
2
1
10
0
5
46
3
2
1
10
0
PRE
5
46
3
2
1
10
0
5
46
3
2
1
10
0
10
10
10
10
MUTE
8
9
11
12
7
8
9
13
14
7
8
9
15
16
7
8
9
17
7
8
9
18
7
8
9
19
7
8
9
20
7
8
9
21
(L)
7
8
9
22
(R)
7
8
9
DIR
OUT
2
2
L
R
2
HF
2
LF
1
2
3
4
5
6
7
8
PAN
LEV
LMx Input Module
40 or 52 identical input modules are fitted.
Module features are described ‘top down’.
PAD switch
Reduces the incoming audio level, before the pre-amp, by
approximately 15dB.
LINE switch
Input select.
Default is MIC XLR.
Press for LINE 1/4” JACK
+48V switch
Press for 48V Phantom power on MIC IN & OUT XLR s.
(check also Master 48V switch)
Ø switch
Press to invert the phase of the selected input
GAIN pot
Range +20 to +70dB.
100 switch
Press for 100Hz high-pass filter
(INSERT POINT)
is located in the signal path, before the EQ section.
EQ section
Silent IN - OUT switch, with green LED indicator
The EQ section features dual-concentric pots
+/- dB adjust on inner control
Frequency adjust on outer control
HF section, bell curve type (internal shelving option)
9
SOLO
PK
+8
0
-6
SIG
10
5
1
0
BAL
SND
INSERT
BAL
RTN
LINE IN
BAL
HM section, ‘bell’ curve type (internal Q option)
LM section, ‘bell’ curve type
LF section, bell curve type (internal Q option)
Frequency range 1.5kHz to 20kHz
Frequency range 400Hz to 8kHz
Frequency range 100Hz to 2kHz
Frequency range 40Hz to 800Hz.
Refer to USER OPTIONS for EQ filter options.
5
M
U
T
E
G
R
O
U
P
S
SAFE
10
15
20
8
30
PIN 1
LIFT
MIX SEND CONTROLS
All MIX sends are with EQ. When PRE sends are desired
without EQ refer to USER OPTIONS
IN
BAL
MIC
OUT
INPUTLMX
8 dual concentric pots for mixes 1 thru 16
inner section = odd #
outer section = even #
Unity gain at about 2 o'clock position #7.
PAGE 8
CENTURY SERIES
LMX
MIX SEND CONTROLS (cont'd)
Use the GLOBAL LEVEL/PAN switch on GROUP module to
change to stereo mix configuration. There is a LEVEL-PAN
switch for each pair of outputs. Each one changes all inputs at
the same time.
In stereo mix configuration: inner = level
outer = pan.
Start with the PAN (outer) set to center position.
PRE switch
Mix sends are normally post fader. Use the PRE switch to
select PRE FADER operation. When PRE is selected the send
includes EQ treatment. Refer to USER OPTIONS for alternatives.
MIX SENDS 17 thru 22
6 single pots for control of 6 mixes. Normally each is a level
control. Use GLOBAL LEVEL/PAN to change to stereo mix
configuration. There is a GLOBAL switch for each pair of outputs. In ‘stereo’ mode start with PAN in the center position.
MUTE switch
Channel audio mute switch with indicator. Audio off = LED
on. Normally all mix sends are muted at the same time. For
alternatives refer to USER OPTIONS.
MUTE also responds to the MUTE GROUP system.
SOLO switch
Individual audio check switch with indicator. User choice of
AFL or PFL source. Use MODE switch on Master module.
PFL = pre-fader, post EQ
AFL = post-fader, post-mute,
Headphones, SOLO meters and operator monitor stereo outputs all switch to follow any SOLO operation. SOLO PRIORITY controls are located on the MASTER module.
Input Module Rear Panel
DIRECT OUTPUT connector
1/4" unbalanced jack, +4dBu, post fader. Carries the direct output signal (post mute) from the input channel.
INSERT SEND/RETURN points
Send 1/4" - balanced jack, +4dBu
Return 1/4" - balanced jack
Insertion point is located in the signal path, before the EQ section.
LINE INPUT connector
Audio from the first twenty input modules is connected internally to the GROUP modules. Input 1 to Group 1 etc. This
connection is direct, bypassing the Input module source selection and is buffered.
PIN 1 LIFT switch
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
MIC IN connector
Input to channel preamp. Electronic balanced, 4 kΩ input
impedance, +48V phantom power available.
MIC OUT connector
Split from Mic In, direct connection, for connection to a second console, or other destination.
PEAK indicator
Responds 3dB before overload. Senses preamp, EQ and postfader levels.
INPUT METER
Shows audio level from -30dB to +8dB. Source normally prefader. Refer to USER OPTIONS for alternatives.
100mm FADER
controls all outputs except those switched to PRE.
MUTE GROUPS 1 - 8.
Each switch assigns the channel mute to a common mute bus.
The indicator lights when pre-selected. Bus master switches
are on the MASTER module. The regular mute switch LED
shows the mute condition.
SAFE switch
Isolates the channel mute from ALL mute group buses.
PAGE 9
LMX
SOLO
ODD EVEN
CENTURY SERIES
FROM INPUT MODULE
GROUP
—
5
10
3
15
20K
1K
HF
–O+
88
16 16
1K
3
600
100
40
STEREO GRP EQ
L
R
2
ODD EVEN
2
L - R TO GROUP
L
TO
2
R
TO
2
5
300
8K
MID
–O+
88
16 16
150
300
6
40
1K
LF
–O+
88
16 16
EQ ON
HPF ON
80
100
200
400
20
STEREO
5
46
3
7
8
9
1
10
0
ON
LR
SOLO
5
46
7
3
8
9
1
10
0
LINE INPUT
ODD
5
46
EVEN
7
3
8
9
1
10
0
ODD
5
46
EVEN
3
7
8
9
1
5
46
7
3
2
9
1
10
0
LINE INPUT
FROM INPUT MODULE
L - R TO GROUP
L
TO
2
R
TO
2
ODD EVEN
ODD EVEN
5
46
3
1
10
0
5
46
3
1
10
0
GROUP TO
L-R ASSIGN
L
R
INSERT SOLO
INSERT ON
LEV
TB ENB
ODD
EVEN
7
9
ODD
EVEN
7
9
PAN
Ø
DIM
MUTE
SIG
SOLO
10
5
0
5
10
15
20
LMx Group Module
All LMx models include 10 similar GROUP modules that are
8
internally assigned to provide mix outputs 1 - 20 and associated functions. Module features are described ‘top down’.
Stereo EQ
For the mix outputs, +/- 16dB each band.
HF bell curve center frequency: range 1k to 20kHz
8
HF cut/boost with center detent
MID bell curve center freq.: range 300Hz to 8kHz
MID cut/boost with center detent
8
LF bell curve center frequency: range 40Hz to 1kHz
LF cut/boost with center detent
EQ ON switches with indicators
For odd and even group output. Allows EQ of either or both
sides.
HPF (high pass filter) switches
with indicators. For odd and even group outputs.
Stereo HPF pot
With cut off frequency range 20Hz to 400 Hz. Attenuation
12dB/octave below cut-off frequency.
STEREO FEED
Stereo input audio comes from the Stereo Master Module.
Dual concentric level controls.
Inner = STEREO INPUT to Odd # mix
Outer = STEREO INPUT to Even # mix
SND
INSERT
BAL
TRN
SND
INSERT
BAL
RTN
ODD
OUT
EVEN
OUT
A mono sum of the Stereo source is used. When the groups
are in Level-Pan mode then the source is mixed in stereo and
the controls are:
Inner = Level
Outer = Balance.
Start with balance at mid-position.
ON switches with indicators
For the odd and even side Stereo Input audio.
LINE INPUT from same # input ch.
These dual concentric level controls add audio from the corresponding # channel Line Input to the group mixes. They are
unaffected by adjustments on the channel.
Inner pot = Odd # mix, outer pot = Even # mix.
LINE INPUT ON and SOLO switches
with indicators. SOLO is PFL only. These sections are
defined as INPUT Solos for priority purposes. Refer to
OPERATIONS for more about LINE INPUT.
PAGE 10
30
L-R TO GROUP
Sub-grouping facility.
Stereo mix 21L/22R is available on each group module.
Left pots: Inner = L to Odd # mix
GROUPLMX
Right pots: Inner = R to Odd # mix
Outer = L to Even # mix
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