Crest audio LMX Technical Data Sheet

CENTURY SERIES

Technical Data

TECHNICAL SPECIFICATIONS

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%

PHASE RESPONSE

20Hz to 20 kHz +20°, -20°

NOISE (22Hz to 22kHz)

Mic EIN (150W, 60dB gain) -129 dBu
Group Output Noise (40 inputs) - 80 dBu

CROSSTALK (Measured at 1kHz)

Channel Mute >100 dB
Channel Fader Attenuation > 85 dB

INPUT/OUTPUT IMPEDANCES

Mic Input 4kΩ balanced
Line Input >10kΩ balanced
Outputs 120Ω 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 + 4 dBu
Nominal Output Level + 4 dBu
Maximum Balanced Output Level +28 dBu

Load support recommendations have been supplied

to assist in road case construction.

All specifications subject to change without notice. © 1997 Crest Audio Inc.

LMx

Sheet

CONFIGURATIONS

Century LMx Consoles feature 10 dual group modules,

Frame Size Imperial Metric

52 67" x 30.21" x12.75" 1700 x 767 x 324mm
64 82" x 30.21" x12.75" 2070 x 767 x 324mm

1.30"/ 33mm

4.8125"
122mm

4.5625"
116mm

2.25"/57mm

1 left/right module, 1 master module,

available in the following input configurations:

40 MONO INPUTS (52 FRAME)
52 MONO INPUTS (64 FRAME)

DIMENSIONS

The following table contains net dimensions

for all Century LMx consoles. (L x W x H)

All information per

Crest Consoles Engineering,

May 5, 1997

19" / 483mm

KNOB HEIGHT, .75"/19mm & 1.25"/32mm

2.375"/ 60mm

SUPPORT ACROSS

THIS AREA IS

RECOMMENDED

35°

30.21"/767mm

31.14" / 791mm

SUPPORT ACROSS THIS DIMENSION IS RECOMMENDED

24.75" / 629mm

28.0" / 711mm

29.5625" / 751mm

DO NOT APPLY ANY
LOADS TO METER
BRIDGE ASSEMBLY

.65"/17mm

12.6875"
322mm

12.5625"
319mm

5.125"

130mm

10°

The sound mixing console shall be constructed in two sizes and be suitable for both fixed installation and touring operations. Audio modules shall be individual for service and addition purposes. Audio
connections shall be accessible from the rear of the console. Mic In and Group Out connections shall be XLR 3-pin balanced types. Insertion points shall be accessible via separate Send and Return 1/4
inch TRS connectors. Primary Inputs and Outputs may be transformer isolated as a chargeable option. The nominal audio level shall be +4dBu, and the maximum output level +28dBu. The console shall
operate from AC mains via the external rack mount power unit included. Optional connection of a second power supply for automatic back-up shall require only a link cable. The 40 channel console
shall measure 67x30.2x12.7 inches (1700x767x322mm). The 52 channel console shall measure 82x30.2x12.7inches (2070x750x322mm). Input Channels shall accept Mic (XLR) or Line (1/4inch) input
by selector switch. The Mic Input shall be passively split and an output XLR connector provided. There shall be a ground lift switch and +48v phantom power control for each channel. Input Gain shall
be continuously adjustable between 20dB and 70dB by gain pot and -15dB by Pad switch. There shall be a phase invert switch active on Mic or Line Input. Each channel shall include switches with indi­cators for: 100Hz high pass filter; EQ On ; Mute (solid-state soft turn-on); Solo; Mute Scene select 1-8; Mute Scene Safe. There shall be 4-band EQ, each band having +/- 15dB variable gain and adjustable
filter center-frequency. The ranges shall be: LF 40-800Hz; LM 100Hz-2kHz; HM 400Hz-8kHz; HF 1.5k-20kHz. Five segment channel signal level LED indicators and overload indicator shall be provided.

Each channel shall have a total of 22 independent sends to the Group Outputs; eight being dual concentric rotary controls (sends1-2,3-4,....15-16) and six single rotary controls (sends 17-22). Seven Pre

switches with indicators shall control the choice of Pre or Post fader audio source. These switches shall be grouped as follows: sends 1-4, 5-8, 9-12, 13-16, 17-18, 19-20, and 21L-22L. Each send level
pair may be configured dual mono or stereo operation by a single global Level/Pan switch associated with each output pair. Channel output level shall be controlled by a 100mm travel slide fader. The
output section shall contain ten Group Modules, each providing two Group Outputs, each output including: mix Insertion send and Return connections; 100mm fader; balanced output with XLR con­nector; bi-color signal indicator and electro-mechanical VU meter. Each Group shall have switches with indicators for Solo; Mute; Dim; Phase Reverse; Talkback Enable; Insert Solo; Insert On-Off. Each
pair of Group Outputs (an individual Group module) shall include: the Global Level-Pan master selector, with indicator; three bands of stereo output EQ with variable frequency and gain; independent
EQ In-Out selectors with indicators; high pass filter with variable frequency from 20Hz to 400Hz and independent In-Out selectors for each output. For each Group there shall be independent Level con­trols and On-Off switches from L and R to each Group. Any or all signals on the 20 Group buses shall be assignable to the L-R Stereo mix. These two subgroup modes shall be interlocked to prevent
inadvertent feedback loops. In addition each Group module shall include Level, Pan and On-Off controls from the Master Stereo Input. Each Group shall include Level, Solo and On-Off switches with
indicators from the corresponding Channel Line Input. One Stereo Output module shall provide Group Outputs 21L and 22R, each with Insertion Send and Return connections; 100mm fader; balanced
output with XLR connector; bi-color signal indicator and electro-mechanical VU meter. Each Group shall have switches with indicators for Solo; Mute; Dim; Phase Reverse; Talkback Enable; Insert Solo;
Insert On-Off; and there shall be one Global Level-Pan master selector for sends 21L & 22R. A Master On-Off switch shall be included for the sum of the Group signals assigned to L-R, which shall not
affect the channel send L-R mix. The L-R output to the Group sections shall have an On-Off switch, and normally be pre L-R fader. There shall be a switch with indicator to connect this output Post fader.
Within the Stereo Output module a dedicated Stereo Input channel shall be provided for stereo mic or line sources with stereo two-band sweep EQ. Switches with indicators shall be provided for EQ In­Out, High pass filter In-Out, Mute and Solo. The channel output shall be available to all Groups via the Stereo sections. Dynamics processing shall be available for in-ear monitor mixing. Above the user­set threshold, audio shall be compressed. When compression exceeds 12dB the audio output level automatically drops, such that the manual function of riding a room-ambience mic between numbers
is achieved hands-free. One Master module shall provide Main, Alternate and Headphone monitor outputs. All outputs shall be stereo. The audio source for all outputs shall be the Solo bus, defaulting
to the operator's choice of silence or an External stereo input or a mono straight-line Input Fader mix. A Mono switch shall convert stereo sources to dual channel mono. The Solo system shall normally
sum multiple Solos, with the option to hear only the last selected Solo. It shall be possible to engage the Solo Priority system so that Input Solo overrides Output Solo. The Solo bus audio shall be either
PFL or AFL of any Input or Output, as selected by the Solo Mode switch. Groups in 'Stereo Level-Pan' mode, and the dedicated Stereo Input, shall be monitored in stereo. Each output shall have an inde­pendent level control and On-Off switch with indicator. The Main level control shall be a 100mm slide fader with optional parallel footpedal operation. The Main fader may be switched to affect the
Alternate output also. The Main and Alternate outputs shall have the option to be switched exclusively. The Headphone output shall include two sockets and be unaffected by the Main and Alternate
channels. There shall be eight illuminated Mute Group master switches, one for each Scene Mute bus. There shall be facilities to generate sine wave and pink noise test signals, and a dedicated input
and preamp for Talkback mic operation. The sum of speech and test-tone shall pass to the Groups (postfader) via the Main Talkback On-Off switch and Group Talkback Enable switches. The Main TB
switch shall be touch sensitive and either latch-on for test-tone or press-hold-release for speech. A dedicated switch shall control the connection of an External Talkback source to the Groups, which shall
not be affected by the Main TB On-Off switch. Indicators shall be provided for the system DC power supply status. There shall be a dimming control for the optional rear mounted lamps. A Master 48V
phantom power switch shall be provided. The console shall have a full-size meter bridge with sunlight-visible mechanical VU meters provided for all 22 output buses and the stereo Solo bus. Meter illu­mination shall be LED. The live monitor console shall be the Crest Audio Century LMx40 (LMx52).

Architect’s & Engineer’s Specifications - Century LMx

Crest Audio specifications are available in electronic form on our website: http://www.crestaudio.com

For use on an 11 inch x 17 inch sheet, print this page out at 130%

Century LMx Console Block Diagram

Crest Audio reserves the right to make changes or improvements

in manufacturing or design which may affect specifications.

1

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

GROUPS GROUPS

LEFT SOLO RIGHT

CIRCUITRY

DEMUX

METER

17 18 19 20

LAMP SOCKETS

3-PIN XLR

( 4 )

METERBRIDGE

REAR OF

LITTLE-LITES

OPTIONAL

METERBRIDGE

FILTERING

SUPPLY

CIRCUITRY

OUT

ILLUM

CIRCUITRY

EXT TB OUT

EXT TB

CONNECTOR

CONSOLE

POWER

LAMP DIMMER

BOARD

METER

MULTIPLEXING

METER

8

DIMMER / MUX

IN

7

POWER FEED TO

RIBBON ENDS

EXT TB IN

EXT TB

M

∑

M

TB FEED TO GROUPS

6

POWER DIST

(FRONT)

LEVEL

TB

TALK

BALK

LOGIC

MASTERS

GROUP

5

MAIN DC POWER

CONNECTION

(TOP PANEL)

TB MIC

MIC PRE

LATCH

ON

MUTE

4

MASTER PHANTOM

SWITCHING

DISTIBUTION TO

POWER

RIBBON

TB MIC

20 30 40DB

M

OSC

FILTER

PINK

NOISE

GEN

3

POWER FILTERING

AND

+48V

ON

TB MIC

GAIN

PHONES

ON

FADER

LEVEL

NOISE

PINK

÷5

FREQ

X2

OSCILLATOR

20-20K

RANGE

10K1K100

1

2

SOLO CONTROL AND SENSE LINES

MUTE GROUP CONTROL

(FRONT)

FOLLOW

LOGIC

LOGIC

LOGIC

PHONES

SOLO

SENSE

MODE

M

R

MASTER

SOLO

SOLO

LEVEL

SELECT

PHONES

SOURCE

PHONES

(TOP PANEL)

PHONES

M

L

PRESSED

PRIORITY

CLEAR

INPUT OUTPUT

AFL PFL

MODE

INDEPENDENT

LAST

SOLO CONTROL

INPUT

ACTIVE

SOLO

MODE

SOLO

MON RIGHT

ALT

M

R

21-22 (40 CHAN LMx) OR27-28 (52 CHAN LMx)

LEVEL

MODE

FROM INPUT

MODULES

ROTARY

C

MON LEFT

ALT

MON RIGHT

MAIN

MON LEFT

MAIN

FOOT-PEDAL

INPUT

CREST AUDIO

DUAL-CON

POT

POT PAD LED AMP

CENTURY LMx BLOCK DIAGRAM

P

M

MON

ALT

L

SLAVE

ALT SLAVED

ON/OFF

MONITOR ON/OFF

CONTROL LOGIC

ALT MAIN

MONITOR ON

M

VCA

SOLO MIX L

∑

LMx MASTER MODULE

MONITOR

FADER

LEVEL

TO METER MUX

SOLO L / R

L & R

EXT INPUT

EXCLUSIVE

MONITOR

M

VCA

MONO

SUM

∑

SOLO

SW

EXT

IN

SOLO MIX R

SOLO DC

FADER

MIX

FADER

INPUT

MIX

∑

∑

DRIVER

LEGENDS

USER OPTIONS

RECTIFIER

METER

JACK

TRS

PIN 2 HOT ON ALL XLRS

FEMALE

XLR

MALE

XLR

SWITCHING

LEV/PAN

GLOBAL CONTROL

INPUT FADER MIX

EVEN

SUM

AMP

BALANCED

SWITCH

PANEL

SHUNT DIP SW

FADER

FET MUTE

FET DIM

ELVIS

17-18

PRE

ODD

∑

M

D

SENDS 19/20 &

SENDS 21/22

OR

LEVELPAN

17/18

REPEATED FOR

ODD

LEV

EVEN

LEV

SENDS

DIRECT OUT

SENDS 13/14 - 15/16

SENDS 9/10 - 11/12

REPEATED FOR

SENDS 5/6 - 7/8

SWITCHING

LEV/PAN

GLOBAL CONTROL

EVEN

SOURCE

METER

PRESENT

EVEN

LEV

PAN

ODD

INSERT RETURN

INPUTS 21 AND 22

INPUTS 27 AND 28

(40 CHAN LMx)

(52 CHAN LMx)

OR

(40 CHAN LMx)

(52 CHAN LMx)

INPUTS 27-28

OR

FADER

POST

SIGNAL

-6

0

SOURCE

SELECT

PRE

PRE SOURCE AMP

ODD

LEV

OR

LEVEL

SENDS

3/4

INSERT SEND

INPUTS 1 THRU 20

SELECT

1 OF 20

1 OF 2

TO MON EXT INPUT

INPUTS 1-20

INPUTS 21-22

FADER

PRE

PRE

AMP

PEAK

+8

EQ FDR

NO

M

MUTE ?

SWITCHING

GLOBAL CONTROL

SELECT

LINE-INS

PRE

LEV/PAN

EVEN

TO GROUP

YES

1-4

PRE

EVEN

PAN

ODD

FADER AMP

LEV

BAL LINE IN

BAL MIC OUT

P

S

PREAMP

INPUT

HPF

FOUR BAND EQ

QQ

SHELFSHELF

M

+10

ODD

LEV

OR

MUTE CONTROL

LEVEL

SENDS

1/2

LF L MID H MID HF

FREQ

EQ IN

FADER

PRE

FADER

POST

MUTE

P

GAIN

100

Ø

OPTION

BAL MIC IN

XFORMER

TO PEAK

LEVEL

PFL AFL

1234

5678

CONTROL

SAFE MUTE SCENES

PIN 1

LIFT

+48V

15dB

PAD

LINE

LMx INPUT MODULE

SOLO

AUDIO

SOLO

&

SOLO CONTROL

SOLO AUDIO

RIGHT POST

*D1100002*

ISSUE 1.0

5 JUN 96

100 Eisenhower Dr., Paramus NJ 07652 USA

TEL

: 201.909.8700

http://www.crestaudio.com

POST

RIGHT PRE

+48

-20

ON

DC

LEFT PRE

LEFT POST

+24

+20

CONTROL

AUDIO

L / R TO GROUPS

CONTROL

AUDIO

&

SOLO

STATUS

POWER

LEDS

DIMMER

LAMP

+48V ON

MASTER

SOLO

PFLAFL

STEREO

TO GROUPS

STEREO IN

DYNAMICS RIGHT

THRESHON

PEAK

PAD +48 LINEHPFØ GAIN

PLØ2-BAND EQ

STEREO IN

RIGHT

MUTE

SOLO CONTROL

MASTER

SEND

DYNAMICS LEFT

CONTROL

&

PRESENT

SIGNAL

GR

SOLO

EQ

SOLO CONTROL

P LØ2-BAND EQ

CONTROL

STEREO IN

LEFT

SOLO AUDIO

AUDIO

SOLO

RIGHT

SOLO AUDIO

AUDIO

SOLO

&

INSERT

SOLO

MIX AMP

PFL AFL

GROUP

PFL AFL

RIBBON CABLES

(FROM L / R)

SIGNAL

LEV/PAN

MUTE

LEFT

FADER AMP

XFORMER

OPTION

R

GLOBAL

LEFT

L

GR

PEAK

LEFT POST

LEFT PRE

RETURN

INSERT

LEFT

STEREO IN

Ø

ON

PRESENT

SIGNAL

INSERT

SEND

LEFT

INSERT

MIX AMP

∑

SOLO CONTROL

SOLO AUDIO

L (ODD)

GROUP

PFL AFL

CONTROL

AUDIO

SOLO

&

SOLO

LEFT

LMx L / R MODULE

( GROUPS 21 / 22 )

SOLO CONTROL

SOLO AUDIO

CONTROL

AUDIO

SOLO

&

PFLAFL

INSERT

SOLO

SOLO CONTROL

SOLO AUDIO

CONTROL

AUDIO

SOLO

&

GROUP

SOLO

EVEN

SOLO CONTROL

SOLO AUDIO

CONTROL

AUDIO

SOLO

&

INSERT

SOLO

GROUP SELECT

EVEN

MIX AMP

GROUP

EVEN

PFL AFL

PFL AFL

∑

PRESENT

SIGNAL

HPF

(SHOWN ABOVE)

HPF

INSERT

SEND

EVEN

TB FROM MASTER

∑

PEAK

R (EVEN)

G

PRESENT

SIGNAL

R

∑

∑

FROM GROUP

L / R ASSIGN

R

G

PEAK

PRESENT

SIGNAL

R

PRESENT

PEAK

G

TB

TB

FADER

LEFT

FADER

RIGHT

Ø

RIGHT POST

RIGHT PRE

FADER AMP

INSERT

ON

OPTION

RETURN

INSERT

INSERT

RIGHT

RIGHT

SEND

RIGHT

MUTE

RIGHT

XFORMER

DIM

DIM

M

M

+10

+10

TO METER MUX

GROUP OUT

LEFT

OUT

RIGHT

OUT

RIGHT

L / R TO

EVEN

GROUP

G

R

Ø

EQ IN

THREE BAND EQ

(SHOWN ABOVE)

INSERT

ON

RETURN

EVEN

INSERT

LEFT

PEAK

TB FROM MASTER

SOLO

ODD

TB

GROUP

MUTE

FADER AMP

EVEN

XFORMER

OPTION

EVEN

MODULES

INPUT

FROM

INPUT

LINE

1-20

PFL

PFL AFL

CONTROL

M

+10

GROUP

OUT

CONTROL

SOLO

SOLO

AFL

EVEN

ODD

TB

FADER

ODD

FADER

EVEN

DIM

DIM

TO GROUP

L / R MIX

ODD

EVEN

L / R ASSIGN

GROUP TO

TO METER MUX

GROUP OUT

ODD

(FROM L / R)

STEREO IN

SOLO

EVEN

ODD

GR

LEV/PAN

GLOBAL

PEAK

THREE BAND EQ - EVEN

LF MF HF

THREE BAND EQ - ODD

GROUP

MUTE

M

FADER AMP

+10

ODD

INSERT

ON

XFORMER

OPTION

RETURN

INSERT

GROUP

ODD

OUT

ODD

Ø

PRESENT

SIGNAL

INSERT

SEND

EQ IN

ODD

MIX AMP

∑

HPF

20 - 400HZ

GROUP SELECT

SOLO CONTROL

SOLO AUDIO

GROUP

ODD

PFL AFL

CONTROL

AUDIO

SOLO

&

GROUP

SOLO

ODD

LMx GROUP MODULE

1 / 2 TO 19 / 20

HPF

SOLO CONTROL

SOLO AUDIO

CONTROL

AUDIO

SOLO

&

PFLAFL

INSERT

SOLO

Printed in USA

FAX

Crest Audio Inc.

: 201.909.8744

v. 2.1 11/19/97