Cadac S-Type Instruction Manual

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Audio Mixing Console
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CADAC Electronics
One New Street
Luton
Bedfordshire
LU1 5DX
England
Tel [phone]
Fax [phone]
email: [e-mail]
While every effort has been taken to ensure the accuracy of the contents in this manual, CADAC Audio Mixing Consoles are being subject to
continuous development, hence the information in this manual may not reflect latest product updates.
© 2005 CADAC Electronics plc

Table of Contents iii
Revision S2005-6 S-Type
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1.1 The console .................................................................................. 1-1
1.2 The frame...................................................................................... 1-1
1.3 Power supply ................................................................................1-2
1.4 The modules ................................................................................. 1-2
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2.1 Setting up the console ..................................................................2-1
2.2 Frame rear connections................................................................2-1
2.3 Connecting power supplies........................................................... 2-2
2.4 Connecting the console frames ....................................................2-5
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3.1 Assigning channels to VCA Masters............................................. 3-1
3.2 Using the sends ............................................................................ 3-1
3.3 Solo a channel (Destructive).........................................................3-2
3.4 Using the PFL ...............................................................................3-2
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4.1 Front panel - mono input channel module 8411 ...........................4-2
4.2 Rear panel - mono input channel module 8411............................4-9
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5.1 Front panel stereo input module 8412 ..........................................5-2
5.2 Rear panel stereo input channel module 8412 .............................5-9
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6.1 Front panel group, matrix and auxiliary output:
Stereo 8413 - Mono 8415 .............................................................6-2
6.2 Rear panel group, matrix and auxiliary output:
Stereo 8413 - Mono 8415 .............................................................6-8
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7.1 Front panel Stereo output, Comms, Osc and
Talkback module 8414.................................................................. 7-2
7.2 Rear panel Stereo output, Comms, Osc and
Talkback module 8414................................................................ 7-10
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iv Table of Contents
S-Type Revision S2005-6

Introduction v
Revision S 2005-6 S-Type
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Welcome to the CADAC S-Type compact frame mixing console. The S-Type is the
result of extensivemarket research, reflecting users’ need for a high quality, moder-
ately sized console with state of the art design and performance.
CADAC have been synonymous with superior audio quality, adaptability in use and
rock solid build for over three decades. The S-Type, created from the same lineage,
is equally suitable for the hard life on the road as well as the perhaps more peaceful
existence in an industrial, corporate or theatre setting.
As is the case with the rest of the CADAC line-up, the S-Type provides complete flex-
ibility that allows for any configuration the user wishes to apply, whilst providing the
reliability that is paramount to the production of a show, concert or corporate event.
The audio legacy of previous CADAC mixing consoles is reflected in the design of
the new S-Type. For those of you familiar with the legendary J and F-Types, it will
come as no surprise to find the same renowned mic amplifier, VCA and fully para-
metric 4-band equaliser and respected audio architecture. The S-Type mirrors the
same attention to quality and detail that have made the CADAC name the ultimate
choice for the discerning professional.
Ergonomics has been placed high on the design brief. Every function switch is sup-
ported by an indicator LED for full visual feedback in low light conditions.
All internal busses are fully balanced and use very low value mix resistors to provide
both low noise and exceptionally low crosstalk.
Output sections are fully balanced and compensated* to provide low noise with the
power to drive long lines - again with very good CMRR.
(*Compensated means that if one leg of the balanced circuit goes short circuit, there
will be no 6dB drop in level.)
All areas of circuitry are extensively power decoupled. This prevents broadband
noise from being transmitted into adjacent circuits through the power rails. Extensive
decoupling of the signal paths minimizes the low frequencies phase shift.
The S-Type frame is available in 3 sizes - 17, 25 or 33-way. In combination, these
frame sizes cater for the most common console requirements, and may, of course be
configuredto meet your specific needs. A standard feature is the ability to connect
frames together via the external frame bus connector.
Finally, it goes without saying, that in the CADAC tradition the sound quality of the S-
Type is in a class of its own.

vi Introduction
S-Type Revision S2005-6

System overview 1-1
Revision S2005-6 S-Type
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Mixing consoles comprise of a number of input channels and output groups with
associated faders, monitoring and control functions. When module positions are
fixed in relation to the frame structure, various operational compromises may occur.
The S-Type console system allows for any module to be placed into any frame posi-
tion and to change the number of frames associated with the system to increase or
decrease the number of input channelsand output groups to meet the needs of a
particular project. Please be aware that the console needs to be turned off before
any reconfiguration can be carried out.
There are three S-Type frames offering either 17, 25 or 33 module positions (slots).
Each frame has provision for main and backup power supply inputs and any two
adjacent frames have full audio bus and control function interconnection via 3 x 37-
way D-type connectors for multiple frame connectivity.
The S-Type frame provides a total of 20 balanced busses - 8 sub-group busses, 1
dedicated stereo bus, 6 mono busses, 2 stereo auxiliary busses, 8 matrix busses
and PFL. A further 8 matrix send busses and a stereo listen bus are provided.
Standard channel VCA faders can access up to 8 VCA master faders.
The S-Type is designed to comply with following standards: EN55103-1:1997,
EN55103-2:1997, EN60065:1998.
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The S-Type frame is constructed from 1.6mm Zintec, fixed to 4mm aluminium end
profiles. This construction allows multiple frames to be positioned so that modules
are almost adjacent. Internal audio bussing is balanced and uses ribbon cables.
The rear panel of the frame contains outputs for the stereo master, plus insert sends
and returns for the same. Two PSU input connectors are provided - one for main and
for the backup supply. Power rail LEDs are provided for each PSU input. The S-Type
frame also incorporates two Littlite connectors in addition to fan and Littlite fuses. A
headphone jack is provided on the front of the frame.
The three standard frame sizes enable a vast variety of configurations to be
achieved. For example:
17 slot frame: 8 mono input channels, 8 output groups and 1 stereo master
25 slot frame: 16 mono input channels, 8 output groups and 1 stereo master
33 slot frame: 24 mono input channels, 8 output groups and 1 stereo master
Note: The choice is yours, a 33 slot frame could be configured as follows:
20 mono input channels, 8 stereo input channels, 4 output groups and 1 stereo mas-
ter.
By bus linking multiple frames together, larger configurations can be achieved. For
example:
Two 25 slot frames:
40 mono input modules, 1 stereo input module, 8 output groups and 1 stereo master.
One 25 slot frame and one 33 slot frame:
48 mono input modules, 1 stereo input module, 8 output groups and 1 stereo master.
Three 25 slot frames:
56 mono input modules, 10 stereo input modules, 8 output groups and 1 stereo mas-
ter.
The module electronics are cooled via internally mounted silent fans.

1-2 System overview
S-Type Revision S2005-6
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The main power supply for the S-Type is integrated into an external 2U rack mount
unit with the option of a backup PSU. See sub-section 2.3.1 Power supply descrip-
tion.
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Mono and stereo input modules are available for the S-Type. Both modules provide
balanced insert sends and returns; four band parametric EQ - selectable pre or post
insert and high-pass filter; balanced direct output - selectable pre/post fader, or post
MIC pre-amplifier,
Each module incorporates a VCA channel fader, VCA Master assignment switches
and a full range level meter (with dual input meters on the stereo input module).
Full details of the module functions can be found in chapters 4 Mono input module
8411 and 5 Stereo input module 8412. Also, see Appendices.
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Each of the output modules provide one Sub-Group output, an 8-way level controlled
send to Matrix, Matrix Master, and an Auxiliary Master output.
Up to 8 modules may be specified per console (maximum configuration being two
8413 and six 8415 modules) and each module can be placed anywhere in the multi-
frame console structure (they do not need to be placed adjacent to each other, or
even in the same frame). Visual monitoring of output levels is provided on full range
LED-meters,PFL facilities on the outputs are provided, asare balanced insert points
on the Sub-Group and Matrix outputs.
Full details of the module function can be found in chapter 6 Group, Matrix and Auxil-
iary Master modules, 8413 stereo and 8415 mono.
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The Stereo Master module is fitted with a 100mm Penny & Giles fader, balanced
insert send and returns and balanced outputs (these are found on the rear of the
frame). The Stereo Master module also provides metering for both the main stereo
mix and listen busses, while the stereo mix bus can also be routed to the Matrix
sends in true stereo or summed mono via 4 dual concentric potentiometers.
Provision is made to inject an unbalanced stereo input source into the main stereo
bus.
The S-Type console offers the operator PFL monitoring functionality. If the source
signal is mono it will appear in mono and if the signal isin stereo it will appear in ste-
reo.
PFL appears at the Listen output, which providesstereo meters, level control via a
potentiometer and mute control. The Listen output busses appear on balanced
XLR's on the rear of the module. PFL is also routed to the Headphones level control
and mute, the output of which is provided via a jack socket on the front of the frame
and is capable of driving 8 ohm loads.
The module also incorporates an oscillator with selectable frequencies at 100Hz,
1kHz and 10kHz. This is then routed via a level control to either the channels or the
groups.

System overview 1-3
Revision S2005-6 S-Type
Littlites can be turned on and dimmed from this module.
The module also provides a talkback microphone input with gain control, HPF and
phantom power. The signal can be routed to all 8 sub-groups and auxiliaries. The
output can be muted, which can then be over-ridden via the talkback button.
Check Mute and Mute All functions are located towards the top of the panel.
Full details of the module functions are discussed in chapter 7 Stereo output,
Comms, Osc and Talkback module 8414.
Full details of the module functions are discussed in chapter 7 Stereo output,
Comms, Osc and Talkback module 8414.

1-4 System overview
S-Type Revision S2005-6

Connections and setup 2-1
Revision S2005-6 S-Type
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The S-Type console is shipped in a flight-case to help protect it against any possible
damage during transit. The following describes how to set up the S-Type:
1. If the console flight case is to be mounted on the CADAC PSU case, then first
remove the PSU’s case’s front and rear cover. Note that if using a 2U drawer
case, there is only a front cover. Both types of cases have wheels fitted with
brakes at the front.
2. Using suitable manpower, place the console flight case on the 2U PSU or draw-
ers case. Make surethatit issafely positioned. Otherwise position the flightcase
on a sturdy surface.
3. Unlock the latches and remove the front section of the console flight case to
reveal the console armrest.
4. Unlock the remaining latches and remove the upper section by lifting it clear of
the console.
5. If usingmultiple frames, then make sure that they are all located in the appropri-
ate positions, all wheels are locked and start cabling the frames together.
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The connections on the S-Type console rear frame include the following:
1. Frame to frame bus connections
2. Littlite connection
3. Stereo output Left
4. Stereo output Right
5. PSU 1
6. PSU 2
7. Littlite fuse 1A
8. Fans fuse 1.5A
9. Frame 0V terminals
10. Send > Insert Send (stereo mix bus)
11. Return > Insert Return (stereo mix bus)
FIG 2-1. Frame rear panel
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2-2 Connections and setup
S-Type Revision S2005-6
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The S-Type console is supplied with the model 8500 Power Supply Unit. Each 2U x
19” rack mount power unit supplies all 4 voltage required by the S-type console. If
more than one frame is to be used, then the 8400 Power Supply Unit may be used.
Cadac consoles are designed to allow the use of two independent power supply sys-
tems in a redundant configuration - main and back-up. Both power supply units are
used to power the console system, so that under normal conditions, the load is
shared equally between the main and back-up PSU. If a fault occurs in one of the
power units (causing it to shut down), the remaining power unit will power the con-
sole.
Designate one power supply unit as “PSU 1” and the other as “PSU 2”. PSU 1 and
PSU 2 should be connected to the same phase on the same ‘spur’, wherever possi-
ble. In situations where it is necessary to provide a separate “feed” to each PSU sys-
tem, make sure the cable lengths are the same. This is to minimize any induced AC
power input noise by ensuring that the ‘EARTH IMPEDANCE’ is the same for both
PSU-systems.
The AC input connectors on each power supply have three conductors: LIVE
(brown), NEUTRAL (blue) and EARTH (green/yellow). For safety and electromag-
netic compatibility considerations, it is essential that the EARTH conductor is con-
nected on all PSUs and the AC supply has an earth conductor that has a continuous
circuit to the ‘zero-signal reference potential’ point in the building. The ZSRP point in
a building is usually found near the place where the AC mains supply enters the
building (often referred to as the MAIN GROUND REFERENCE EARTH ELEC-
TRODE SYSTEM). The basic concept for correct AC mains wiring distribution is
shown in figure 2-2. If you need further information about this complex subject,
please refer to “Grounding systems and their implementation” by Charles Atkinson
and Philip Giddins published in the AES Journal vol 43, No 6 - June 1995.
The grounding scheme in CADAC consoles is designed to meet the rigorous EEC
Electromagnetic Compatibility requirements (EMC directive - 1996). Any RF noise
induced in the console frame(s) is directed to the local ZSRP, which isthe metalwork
of the power supply units. In order to take full advantage ‘RF noise immunity’ capabil-
ity of the CADAC system, PSU AC mains cables and the AC mains supply EARTH
conductor must be connected correctly.
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FIG 2-2. AC mains grounding diagram (single phase 200-240V)

Connections and setup 2-3
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CADAC 8500 power supply units are designed to run from a minimum of 100V up to
a maximum 250V, 50/60Hz.
The 8500 is rated at +13V@15A, ±18V@11A and 48V@0.5A. This is sufficient to
supply power to one frame. In the case of more than frame, each frame can be pow-
ered by a pair of 8500 Power Supply Units (one main and one for back-up purposes).
Alternatively, 8400 Power Supply Units may be used, however please contact your
local distributor, or CADAC directly before any connections are made.
The AC input is connected to the PSU via a 3-core cable, CMA reference 3183TQ -
BASEC approved.
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The 8500 is based on a Excelsys power block, rated at +13V@15A, ±18V@11A and
+48[email protected], with additional circuitry as shown in the accompanying drawing set.
The 2U power supplies are suitable for rack-mounting or flight cases, and are con-
nected via a shielded multi-core cable with 6 pole military circular bayonet at each
end. Each console may be powered from two independent power supply systems,
operating simultaneously for continuous redundant operation.
FIG 2-3. 8500 power supply unit

2-4 Connections and setup
S-Type Revision S2005-6
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Each 8500 switch-mode power supply provides the following outputs: 13V, ±18V and
48V. Each PSU is fitted with a front panelmounted 9-way ‘D-type’ connector labelled
“Connections for Remote Start”. If a remote start facility is used, Power Failure and
Over-temperature LEDs may also be fitted with the remote start switches if required.
Fig 2-5 shows the circuit for starting up a ‘system’ with a single switch. This has
proved to be the most popular method of connecting the remote start facility. This cir-
cuit can easily be extended to provide a single switch for all PSUs if required. If mul-
tiple switches are to be used, see fig 2-4.
NOTE:
■
■■
■The remote start switch must be of a ‘momentary’ type. You can use 3 separate
single pole switches for each power supply to turn on 13V, ±18V and 48V outputs of
the PSUs alternatively use one single pole for the whole lot.
■
■■
■The remote switch(es) must be mounted on a metal panel.
■
■■
■Use shielded cable for the remote switch wiring.
■
■■
■The 9-way D-type free plug must have a conductive shell. This is to ensure that
the cable shield connects directly to the PSU unit chassis.
■
■■
■Connect the cable shield to the metal panel where the remote start switch(es)
are mounted.
FIG 2-4. Remote start with multiple switches
FIG 2-5. Remote start with a single switch

Connections and setup 2-5
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If replacing a power supply unit is required, please note the following:
■
■■
■The work should only be carried out by a suitably qualified electrician.
■
■■
■Make sure that the power supply system’s power switches are in the OFF posi-
tion and the unit is disconnected from the mains.
■
■■
■Observe the correct polarity when connecting the new PSU.
■
■■
■Note that a console must never have one voltage without the other, for example
+18V must never be fed into the console without -18V.
When switching the power supply back ON after replacement has taken place, make
sure that both LEDs on the front of the PSU-system come on. If only one LED comes
on,letgo of the ONpush-button immediately. Failure to do so may lead tofire hazard
and major damage to the console.
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When linking frames, plug the frame bus cable as shown in the diagram below:
Also, see Appendices.
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Connect the frame-to-frame grounding cable. See figure 2-6 above for the location of
the frame 0V terminals.
FIG 2-6. Audio Bus connections.
Frame 0V terminal
Frame to frame bus
connections
Frame 0V terminal

2-6 Connections and setup
S-Type Revision S2005-6

How to use the S-Type 3-1
Revision S2005-6 S-Type
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This section of the manual provides instructions and information on how to use the
S-Type. The flexibility of the S-Type allows the operator to achieve the same result in
several ways. In this section you will learn how to perform certain procedures to
achieve a desired result. This does not mean, however, that the same outcome can-
not be achieved by taking a different route.
So to assist you in the most efficient way to become familiar with the S-Type, please
start with the instructions given. As you build up experience, you may well find that
alternative ways are better suited to your work practice.
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On the input channel, press the desired VCA Master numerical button to assign the
input channel to that specific VCA Master fader. These assignment switches can be
found to the left of the equalizer section. Normally you would assign a given number
of input channels to one specific VCA Master, however, it is possible to assign an
input channel to more than one VCA Master should this be required.
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The S-Type allows for routing to eight Sub-Groups with optional PAN control. To route
to a Sub-Group, press the Send ON button for the desired Sub-Group 1-8. Send ON
is indicated by the associated LED illuminating. Press the PAN button if you want to
use thePAN control. The signal can also be routed to the dedicated stereo bus using
the associated stereo push-button (ST) and PAN control, the latter being perma-
nently active on the stereo send.
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The input channel module has a dedicated Auxiliary ON/OFF switch for each Auxil-
iary send. The module has facilities for routing to 8 auxiliary busses. The first of
these are stereo and are controlled by dual concentric potentiometers, the upper for
setting the signal level, and the lower control for positioning the signal in the stereo
field.
The remaining six sends are mono and have associated signal level controls.
All eight auxiliary sends can be individually switched pre or post fader.

3-2 How to use the S-Type
S-Type Revision S2005-6
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By using the assignment buttons in the Sub-Group section in the respective input
module, selecta Sub-Group to which the signal has been routed. On theappropriate
matrix sends section on the Group/Matrix module (8413 & 8415), enable the desired
matrix send by selecting its corresponding switch. The matrix level can then be set
using the associated matrix output level control.
To route the signal from the stereo mix bus to the matrix, select and enable the
appropriate matrix send switches on the stereo output module (8414).
Example: If you would like to send the stereo output to matrix sends 3 and 4; press
button 3 and 4 to route the left and right signal to matrix sends 3 and 4. Press SUM
L+R if you wish to route the stereo signal as a mono sum to matrix sends 3 or 4.
Note that odd numbers refer to left channels and even numbers to right channels.
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Press Check Mute locatedat the top ofthe 8414 module, then select the appropriate
Mute button of the channel you wish to solo.
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The S-Type has facilities for monitoring through loudspeakers or headphones, each
with its own level control for comfortable listening. Visual indication on the dual chan-
nel LED meter is also provided. The Listen facility is independent of whether the sig-
nal is in mono or stereo; it will appear in both left and right channels - either in mono
to both left and right, or in true stereo.
Unless the PFL HOLD button is selected, pressing a PFL button will cancel any pre-
viously selected PFL. Selecting the PFL HOLD function allows more than one mod-
ule PFL to be routed to the Listen bus at any one time.
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Press the PFL button on the relevant input channel module to listen to the signal pre
fader via the listen module.
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Enable the PFL HOLD button on the 8414 module. Then press PFL on each of the
channels to be monitored.

Mono input module 8411 4-1
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The S-Type mono input channel module features a microphone input amplifier, which
is the same as that fitted to the legendary J-Type - the most prevalent theatre con-
sole in the industry. The module has a full four-band parametric equaliser - also orig-
inating from the J-Type - which may be switched to pre or post the insert point. The
8411 also includes a HP-filter with a cut-off frequency of 160Hz and a slope of 12dB
per octave.
The module incorporates a fully balanced direct output with level control; normally
post fader but may be switched to pre fader or even post mic amplifier.
The input module allows routing to eight sub groups with optional pan control. It can
also route to a dedicated stereo bus via the pan control. Additionally, it is possible to
route to eight auxiliary busses; the first two of which are stereo on dual concentric
potentiometers - level on the upper control and PAN on the lower control. The
remaining six are mono with level control. All eight sends can be enabled and
selected to be sourced pre or post fader on an individual basis.
Each input channel can be assigned to up to a maximum of eight VCA masters.
The 8411 input channel module is equipped with a fully balanced insert send and
return - the send stays live irrespective of whether the insert button is pressed. Also
included are PFL and Mute buttons - inclusive of a destructive solo function.
The module is fitted with a 100mm P&G fader and located next to it, a 12 segment
prefade input meter with a range of +18dB to -36dB (meter source is pre-fader).
There is also a fader-open LED which, when extinguished, indicates that either the
channel fader is closed or muted, or an assigned VCA Master is muted or pulled
down to infinity.
Following pages describes the 8411 module in detail.

4-2 Mono input module 8411
S-Type Revision S2005-6
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Press this button to apply a line-up tone to the input. The frequency and level of the
line up tone is set from the Stereo output, Comms, Osc & Talkback module 8414.
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This rotary control adjusts the MIC input gain between +10dBu and +60dBu.
71416 053G%#SDG
Pressing this button applies a -20dBu pad to the MIC input to accommodate for line
level sources @0dBu (0.775V).
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Press this button to reverse the phase of the incoming signal.
71418 7;9#3KDQWRP#SRZHU
Press this button to switch on 48V phantom power to any connected microphone,
Please note that the 48V phantom power is disabled on this channel if the OSC
switch is selected.
4.1.2 Input gain
4.1.5 Phantom power 48V
4.1.7 Direct output level control
4.1.11 PAN-control
4.1.1. Oscillator
4.1.3 -20dBu PAD
4.1.4 Phase reverse
4,1.6 Direct output select
4.1.8 Sub-Group routing
4.1.9 Stereo
4.1.10 Pan