CS12M
Operators Manual
Klark Teknik Building
Walter Nash Road
Kidderminster
Worcestershire
DY11 7HJ
Tel: +44 (0) 1562 741515
Fax: +44 (0) 1562 745371
Email: info@uk.telex.com
Website: www.ddaconsoles.com
CS12M Operators Manual
Telex Communications (UK) Limited
In line with the company’s policy of continual improvement, specifications and function maybe subject
to change without notice. This Operator Manual was correct at the time of writing. E&OE.
Contents
Introduction ................................................................................. 4
Safety precautions........................................................................5
Transport ..................................................................................... 5
CS12M quickstart ........................................................................6
CS12M specification..................................................................10
CS12M dimensions and wieghts ................................................ 11
The mono input module ............................................................. 12
The stereo input module ............................................................ 20
The output module ..................................................................... 28
The master module..................................................................... 31
The power supply ...................................................................... 37
Installation guide ........................................................................ 38
Tutorial ....................................................................................... 41
Recommended auxiliary equipment ........................................... 49
Glossary ..................................................................................... 50
Warranty ..................................................................................... 55
Declaration of Conformity ......................................................... 56
The information in this manual has been carefully verified and is believed to be correct,
however, DDA reserves the right to modify the product described in this manual at any time.
This document may not be copied or reproduced by any method whatsoever, whether in part
or in whole, without the written permission of DDA.
© Copyright 1998 DDA. All rights reserved.
DOC02-CS12/B
3
INTRODUCTION
The DDA CS12M is a Truly affordable medium format Stage Monitor audio
mixing console, allowing a cost-effective upgrade from the dual FOH/Monitor mixing
scenario, often seen during smaller performances. CS12M, available with between
16 and 40 inputs, also opens up the possibilities of using Stereo In Ear Monitoring
to applications previously restricted by finance.
ALL DDA CS12M consoles include:-
A customer specified number of mono input modules, each with wide range
Mic or Line level input section, a 4 band Equaliser, 12 full-time monitor
sends and separate channel
4 stereo inputs.
Pre/Post fader selection switches for added flexibility.
Front Panel switchable Mono or Stereo monitor send selection.
A Semi-Modular construction allowing user option setability and future-proof
maintenance possibilities.
level control.
Built in Mic Splitter on all inputs.
13 Long Throw faders on all monitor outputs and local stereo output.
Extensive output control allowing individual selection of
talkback selection, AFL Solo and Mute.
Full Output Metering with the unique Bus Peak indication.
Full console linkability, allowing any two CS12M consoles to be used as
one.
Global +48 volt phantom power disable, allowing complete
of microphones from the FOH position.
output phase,
and safe control
4 CS12M OPERATION MANUAL
SAFETY PRECAUTIONS
IMPORTANT - PLEASE READ BEFORE
INSTALLING YOUR
Strong sources of electromagnetic radiation e.g. high power cabling, video monitors
and radio transmitters may cause degradation of the audio quality due to induced
voltages in the chassis and connection leads. Site the console away from such
sources. For the same reason it is advisable to site the power supply away from the
console.
Ö Electronic components are susceptible to conditions of excessive heat or
extreme cold so take care not to use your console under such conditions.
Ö Before powering up the console make sure that the power supply voltage
selection matches the local mains supply.
Ö Never connect or disconnect the power cable without switching off the power
supply. Similarly switch off the console before removing or servicing modules.
Ö Do not attempt to wipe clean the console with a cleaning liquid. Most surfaces
can be simply cleaned with a soft dry brush. Should the chassis or channel
ident strips need cleaning use only water or isopropyl alcohol. Solvent based
products should not be used as they may damage these parts.
CS12M
CONSOLE
Ö Use a wax based crayon to write on the scribble strips. The use of adhesive
backed tapes may damage the screen printing on the modules.
TRANSPORT
It is recommend that you retain all the packing from your console should you ever
need to return it for service or move the console to other premises.
If the console has to be moved regularly then we suggest that you purchase a foam
lined flight case, available from your distributor if you cannot purchase one locally.
Only use the power supply and cables provide. Your warranty is invalidated if other
supplies or cables are used.
If you experience any problem with the local mains, or during thunder storms, switch
off the power supply and unplug it from the mains supply.
SAFETY PRECAUTIONS
5
CS12M QUICKSTART
For this you should have the following items available.
n Microphone and cable.
n Power amplifier with mains cord and signal cable.
n Loudspeaker with connecting cable.
n Headphones.
n CS12M console with power supply.
First of all make sure that the power supply is suitable for
connection to your local supply and then connect the console to
the power supply. Connect your loudspeaker(s) to the amplifier
and set the volume control(s) to a low level.
Connect the microphone into channel 1 and the power amplifier
into Monitor Send 1 Output.
Switch ON the console BEFORE switching on the power amplifier.
Check that the leds on the master module illuminate for the +/-
18V and +48V power rails. If phantom power is required for
your microphone then ensure that
the +48V ON led is illuminated. If
not use a blunt non conducting
instrument such as a pencil or pen to push the switch
which is located under the panel.
Press the +48V switch on the input module if phantom power is
required, for a condenser mic or DI box.
INPUT GAIN
Select hi gain on channel 1 by having the GAIN switch in the UP
position.
Turn up the INPUT GAIN control on channel 1 until the signal present led is on but
not so high that the peak led is on when speaking into the microphone.
6 CS12M OPERATION MANUAL
Turn up the (rotary) fader on channel 1 to the 0dB calibration
point. Make sure that the MUTE switch is neither pressed or
illuminated.
Turn the control for monitor send 1 to around
number 7.
Push up the fader on output module 1 to
the 0dB point.
PRE
PRE
5
6
4
1
3
7
2
8
9
1
0
10
5
6
4
2
3
7
2
8
9
121
2
1
0
10
5
6
4
3
3
7
2
8
9
1
0
10
5
6
4
4
3
7
2
8
9
1
0
10
5
6
4
5
3
7
2
8
9
1
0
10
5
6
4
3
6
7
2
8
9
1
0
10
1
2
Look for signal on the group output meter by speaking into the microphone. The
level should be around +6dB with occassional flashing of the red leds. The BUS
PEAK leds should not flash. If the level is too low then re-adjust the input gain
control on the input module.
Ideally the input fader should remain close to the 0dB point with the SIGNAL
PRESENT led ON. The PEAK led should not be indicating other than very
occassionally. If the input level is too high then reduce the gain with the INPUT
GAIN control.
If the power amplifier and loudspeaker are connected to this output you will then
hear yourself from the loudspeaker (beware of feedback).
CS12M QUICKSTART
7
Do not attempt to plug microphones into these connectors.
They are used to plug LITTLITESTM into and will damage a
microphone.
Press the PFL key on the input module and observe the left
hand meter on the master module. It will show the pre fader
signal from the input module.
This can only be changed by adjustment of the INPUT GAIN
control.
Cancel the input PFL and press AFL on output module 1 to
observe the output signal. This will change if the INPUT
GAIN, INPUT FADER or OUTPUT FADER are adjusted.
Plug headphones into the headphone socket located below
the armrest and turn up the volume to hear the selected AFL
(or PFL) signal.
Congratulations its all working the way it should.
8 CS12M OPERATION MANUAL
This drawing illustrates the simple quick start set up.
POWER AMPLIFIER
LOUDSPEAKER
PSU
CHANNEL 1
XLR INPUT
CS12M
CS12M QUICKSTART
MONITOR SEND 1
XLR OUTPUT
PSU INPUT
9
CS12M SPECIFICATIONS
Nominal Operating Level +4dBu with a unity gain structure.
Frequency Response 20Hz - 20kHz +/-0.5dB any input to any output at a gain <
50dB.
EQ range
HF +/-15dB @ 10kHz shelving
Hi Mid +/-15dB 470Hz - 15kHz, Q = 1.4
Lo Mid +/-15dB 70Hz - 2.2kHz, Q = 1.4
LF +/-15dB @ 100Hz shelving
Hi Pass Filter, 80Hz, 18dB/octave roll off
Channel Mute Attenuation > 90dB @ 1kHz
Input Monitor Send Attenuation > 85dB @ 1kHz
Distortion
0.005% @1kHz any input to any output at a gain < 50dB.
Noise: -82dBu (24 channels routed and muted)
EIN: -127.5dBu ref 200 ohms
EIN: -128.7dBu ref 150 ohms
Maximum output level: +20dBu into a bridging load
Maximum input level: +30dBu
Input Impedance: >2kohm
Output impedance: <75R
Signal present threshold: -21dBu
Peak led threshold: 3dB below clipping
Power consumption: < 300 Watts
10 CS12M OPERATION MANUAL
CS12M DIMENSIONS AND WEIGHTS
CONSOLE WEIGHTS AND DIMENSIONS
(Unpacked) (Packed) Dimensions
16 22kg/48.5lbs 30kg/66.1lbs 104 x 65 x 30 cms
40.9 x 25.6 x 11.8 inches
24 26.6kg/58.7lbs 40kg/88.2lbs 129 x 65 x 30 cms
50.8 x 25.5 x 11.8 inches
32 31.2kg/68.8lbs 50kg/110.2lbs 154 x 65 x 30 cms
60.6 x 25.6 x 11.8 inches
40 35.8kg/79lbs 60kg/132.3lbs 180 x 62 x 40 cms
70.9 x 24.4 x 15.7 inches
POWER SUPPLY DIMENSIONS
This is a 2U high rack mounting box with a depth of 172mm/6.75.
PSU Weight: 5kg/11lbs
CS12M DIMENSIONS AND WEIGHTS
11
THE MONO INPUT MODULE
The mono input module contains a high quality balanced input stage
+48V
30
5
0
20
-10
15
HI
GAIN
LO
REV
O
80Hz
0
HF
33
6
99
12
-
15
1K8
800
HI
0
33
MID
6
99
12
-
15
250
100
LO
70
0
3
MID
6
99
12
-
15
0
LF
3
6
99
12
-
15
EQ
that is used for the microphone and line input signals.
40
10
50
15
This stage is followed by a High Pass Filter, Equaliser and Insert Point
20
65
before the signal is passed through the channel fader to become available
for the monitor send buses. The pre equaliser and the pre fader signals
can also be used to feed the monitor sends depending upon the
10kHz
6
operational circumstances.
12
+
15
3K5
7K5
A total of 12 Monitor Sends are available, 6 of which can be switched
15K470
6
for stereo operation, the two level controls forming a PAN and LEVEL
12
+
15
pair.
500
1K2
2K2
3
PEAK and SIGNAL PRESENT leds assist in setting the pre-fade
6
12
signal level and the signal may be metered and listened to using the
+
15
100Hz
3
6
PFL facility.
12
+
15
PRE
5
6
4
1
3
7
2
8
9
1
0
10
5
6
4
2
3
7
2
8
9
1
0
10
5
6
4
3
3
7
2
8
9
1
0
10
5
6
4
4
3
7
2
8
9
1
0
10
5
6
4
5
3
7
2
8
9
1
0
10
5
6
4
3
7
6
2
8
9
1
0
10
5
PAN
6
4
7
3
7
2
8
9
1
0
10
R
L
5
LEVEL
6
4
3
8
7
2
8
9
1
0
10
PRE
5
PAN
6
4
9
3
7
2
8
9
1
0
10
R
L
LEVEL
5
6
4
10
3
7
2
8
9
1
0
10
PRE
5
PAN
6
4
11
3
7
2
8
9
1
0
10
R
L
5
LEVEL
6
4
12
3
7
2
8
9
1
0
10
MUTE
0
+
10
PEAK
LEVEL
SIG
PFL
12 CS12M OPERATION MANUAL
THE MONO INPUT MODULE
+48V
Provides 48 volt phantom power for a condenser
microphone, or D.I. box. The 48V ON switch on the master
module must be ON for phantom power to operate. Optional
balancing transformers may be fitted to the Mic/Line Inputs.
GAIN POTENTIOMETER
The gain control is a wide range rotary potentiometer which
is active on both Mic and Line Inputs. With Hi gain selected
the gain can be adjusted from 15dB to 65dB. For Lo gain
inputs, the adjustment is from -10dB to +20dB.
HI/LO GAIN
Pressing this inserts an attenuator into the input circuit and alters the range of gain
adjustment available. This should be pressed when high level or line level signals are
connected to the channel through the line input jack. Note that if a jack is not
inserted into the line input socket then the XLR connector may be used as the line
input. The TRS jack could also be used as a microphone input although this is not
recommended and phantom power will not be available.
Ø REV
Pressing this reverses the phase (or more correctly the polarity) of the input signal.
If a sound source is picked up by more than one microphone and there is a phase
or polarity difference between the microphones then the signal may be completely
or partially cancelled leading to a very thin sound. Phase or polarity reversal can be
used to correct the situation. In some instances the cancellation induced by using
polarity reversal can be used constructively to eliminate spill from one microphone
to another although care is required when trying this.
80Hz
This inserts an 80Hz highpass filter with a rolloff of 18dB per octave into the signal
path after the input amplifier. This may be used to eliminate unwanted low-frequency
noises transmitted to the microphone through a floorstand for example.
MONO INPUT MODULE
13
HF
HI
MID
LO
MID
LF
0
33
6
99
12
-
15
1K8
800
33
6
99
12
-
15
250
100
70
3
6
99
12
-
15
3
6
99
12
-
15
10kHz
6
12
15
3K5
15K470
0
6
12
15
500
2K2
0
3
6
12
15
0
100Hz
3
6
12
15
EQ
+
7K5
+
1K2
+
+
THE EQUALISER
The equaliser is a 4 band design with shelving high and low
sections in addition to two swept mid frequency sections.
All sections have a range of +/-15dB.
HF
A shelving high frequency equaliser operating at 10kHz which
can be used to boost or cut the high frequency content of the
signal.
HI MID
A peaking equaliser which can be used to boost or cut signal
within the frequency range 470Hz to15kHz with a Q of 1.4.
LO MID
A peaking equaliser which can be used to boost or cut signal
within the frequency range 70Hz to 2.2kHz with a Q of 1.4.
LF
A shelving low frequency equaliser operating at 100Hz which
can be used to boost or cut the low frequency content of the
signal.
EQ
This switch inserts the equaliser into the signal path. If the equaliser is not required
then noise and distortion, although very low, can be minimised by ensuring that the
equaliser is not switched into circuit. If the equaliser is used then an immediate
comparison between the unequalised and equalised sound is made possible by
using this switch.
INSERT
Although there is no front panel control the insert point follows the equaliser. With
nothing plugged into the insert jack signal is simply passed through to the channel
fader. When a jack is inserted the signal path is broken and signal is forced to flow
through an external device before returning to the module. The insert return signal is
used to operate the PEAK and SIG leds.
14 CS12M OPERATION MANUAL
EQUALISATION AND FILTER RESPONSES
HIGH PASS FILTER
HI MID EQUALISER
LO MID EQUALISER
HF/LF EQUALISER
15MONO INPUT MODULE
THE MONITOR SENDS 112
1
2
3
4
5
6
7
8
9
10
11
12
PRE
5
6
4
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
7
8
9
0
10
5
6
4
7
8
9
0
10
5
6
4
7
8
9
0
10
5
6
4
7
8
9
0
10
5
6
4
7
8
9
0
10
5
6
4
7
8
9
0
10
There are 12 monitor sends six of which can be used as
stereo pairs or individual mono sends. All sends are post
fade until a PRE switch is pressed. There are three PRE
switches covering sends 1-6, 7-10 and finally 11-12.
MONITOR SENDS 1/2/3/4/5/6/7/8/9/10/11/12
These controls adjust the signal level to the individual monitor
sends. Thus to send more signal to Monitor Send 2 simply
turn up the control. Note that these monitor sends normally
receive the POST FADE signal and that the PRE switch
must be pressed to obtain a pre fade signal.
Monitor sends 7 through 12 can be used as stereo sends by
pressing the STEREO switch on the output module and in
this case the odd numbered control, for example number 7,
will be used to pan the mono signal across the stereo output.
The even numbered control, for example number 8, will be
used as the level control.
PRE 1-6
This sends a prefade signal to Monitors 1 through 6.
Normally internal link 7 will be installed giving a pre fade
5
PAN
6
4
3
2
1
L
3
2
1
PRE
3
2
1
L
3
2
1
PRE
3
2
1
L
3
2
1
7
8
9
0
10
R
5
LEVEL
6
4
7
8
9
0
10
5
PAN
6
4
7
8
9
0
10
R
LEVEL
5
6
4
7
8
9
0
10
5
PAN
6
4
7
8
9
0
10
R
5
LEVEL
6
4
7
8
9
0
10
post mute signal. Removing link 7 and inserting link 8 allows
a pre equaliser signal to be sent.
PRE 7-10
This sends a prefade signal to Monitors 7 through 10.
Normally internal link 3 will be installed giving a pre fade
post mute signal. Removing link 3 and inserting link 4 allows
a pre equaliser signal to be sent.
PRE 11-12
This sends a prefade signal to Monitors 11 and 12. Normally
internal link 5 will be installed giving a pre fade post mute
signal. Removing link 5 and inserting link 6 allows a pre
equaliser signal to be sent.
16 CS12M OPERATION MANUAL
THE CHANNEL FADER
MUTE
When pressed this mutes the POST FADE signal and any
POST FADE monitor sends.
LEVEL
This rotary control adjusts the post fade signal level within
the module. Any monitor send receiving the post fade signal
will be dependent upon this fader.
PEAK
This illuminates when the signal level is too high and close to
being clipped. Clipping is a severe form of distortion and
indicates that the input gain of the module should be reduced.
SIG
This illuminates in the presence of signal and may be a useful diagnostic aid in the
event of any problems.
PFL
This allows the module signal to be listened to in isolation on the monitoring system.
If pressed when an output AFL is active the output will be muted so that the input
can be heard. When the input PFL is released the output AFL will be returned to
the local monitor. This is known as input priority.
MONO INPUT MODULE
17
MONO INPUT CONNECTOR AND PIN DEFINITIONS
Mic Line Input : 3 Pin Female XLR type,
Balanced Pin 2 Hot
Nominal Input Level: -16dBu to -66dBu
Pin 2 : Signal +ve (Hot)
Pin 3 : Signal -ve (Cold)
Pin 1 : Ground
Input Impedance : >2 kOhm
Split Output : 3 Pin Male XLR type,
Balanced Pin 2 Hot
Nominal Output Level: -16dBu to -66dBu
Pin 2 : Signal +ve (Hot)
Pin 3 : Signal -ve (Cold)
Pin 1 : Ground
Line Input : 1/4" TRS Jack Socket, A Gauge, Balanced
Nominal Input Level: -16dBu to +14dBu
Tip : Signal +ve (Hot)
Ring : Signal -ve (Cold)
Sleeve: Ground
Input Impedance : >10 kOhm
Insert Point : 1/4" TRS Jack Socket, A Gauge, Unbalanced
Nominal Input/Output level: 0dBu
Tip: Insert Send
Ring : Insert Return
Sleeve: Ground
Output Impedance: <75 Ohm
Input Impedance : >10 kOhm
The GROUND LIFT switch isolates both the Microphone Input and the Split
connector from the console ground. It may be of use when the split connector is
feeding a front of house console when there is a great danger of ground loops being
formed.
PUSH
3
1
2
MIC INPUT SPLIT OUTPUT
3
1
OUTPUT XLR
GROUND
LIFT SWITCH
SIGNAL + (HOT)
2
SIGNAL - (COLD)
GROUND
INPUT XLR
3
1
2
LINE INPUT
PUSH
3
2
1
INSERT
SIGNAL + (HOT)
SIGNAL - (COLD)
GROUND
SEND
RETURN
GROUND
18 CS12M OPERATION MANUAL
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