Crest Audio CENTURY SERIES LMX - TECHNICAL Technical Data

C
E N T U R Y
T S
E C H N I C A L
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
PHASE RESPONSE
20Hz to 20 kHz
NOISE
(22Hz to 22kHz)
Mic EIN (150W, 60dB gain)
Group Output Noise (40 inputs)
CROSSTALK
(Measured at 1kHz)
Channel Mute
Channel Fader Attenuation
INPUT/OUTPUT IMPEDANCES
Mic Input
Line Input
Outputs
INPUT/OUTPUT LEVELS
Mic Input Sensitivity
Line Input Sensitivity
Input Insertion Point Level
Output Insertion Point Level
Nominal Output Level
Maximum Balanced Output Level
Load support recommendations have been supplied
to assist in road case construction.
All specifications subject to change without notice. © 1997 Crest Audio Inc.
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 indi-
cators 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 con-
nector; 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 con-
trols 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 In-
Out, 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 user-
set 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 inde-
pendent 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 illu-
mination shall be LED. The live monitor console shall be the Crest Audio Century LMx40 (LMx52).
Crest Audio specifications are available in electronic form on our website: http://www.crestaudio.com
Technical Data
P E C I F I C AT I O N S
<0.01%
+20°, -20°
-129 dBu
- 80 dBu
>100 dB
> 85 dB
4kΩ balanced
>10kΩ balanced
120Ω balanced
(0VU = +4 dBu, 1.23V RMS)
+ 4 to -62 dBu
+ 12 to -38 dBu
+ 4 dBu
+ 4 dBu
+ 4 dBu
+28 dBu
Architect's & Engineer's Specifications - Centur y LMx
S
E R I E S
Sheet
C
Century LMx Consoles feature 10 dual group modules,
1 left/right module, 1 master module,
available in the following input configurations:
40 MONO INPUTS (52 FRAME)
52 MONO INPUTS (64 FRAME)
The following table contains net dimensions
for all Century LMx consoles. (L x W x H)
Frame Size
52
64
All information per
Crest Consoles Engineering,
May 5, 1997
1.30"/ 33mm
4.8125"
122mm
4.5625"
116mm
2.25"/57mm
35
LMx
O N F I G U R AT I O N S
D
I M E N S I O N S
Imperial
67" x 30.21" x12.75" 1700 x 767 x 324mm
82" x 30.21" x12.75" 2070 x 767 x 324mm
30.21"/767mm
DO NOT APPLY ANY
LOADS TO METER
BRIDGE ASSEMBLY
SUPPORT ACROSS THIS DIMENSION IS RECOMMENDED
24.75" / 629mm
28.0" / 711mm
29.5625" / 751mm
Metric
12.6875"
322mm
12.5625"
319mm
5.125"
130mm
.65"/17mm
10