KLING & FREITAG C2 User manual

KLING & FREITAG System Controller C2
User's Manual
Important Information,
Please Read Before Use!
KLING &FREITAG GmbH
Junkersstrasse 14
D-30179 Hannover
PHONE [phone]
FAX [phone]
www.kling-freitag.de
Version 4.0
Released: 23.03.2006

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 2 of 33

User’s Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 3 of 33
Thank you for your decision to buy a KLING & FREITAG product. To guarantee a trou-
ble-free operating of the equipment and to enable the KLING & FREITAG C2 Control-
ler to achieve its full potential, please read the operating instructions carefully before
use.
With the purchase of the C2 Controller, you have acquired a device with the highest
possible quality and performance capabilities.
As the owner of this system, you now have a versatile and highly professional tool
which, when operated properly, is a true pleasure to use.
Symbols in User's Manual
Warning
This symbol indicates the possibility of life-threatening danger and a
health risk for persons. Not following these instructions may result in
serious health problems including potentially fatal injuries.
Caution
This symbol indicates a possibly dangerous situation. Not following
these instructions may cause minor injuries or cause property dam-
age.
Important
This symbol gives instructions for the proper use of the described
products. Not following these instructions may cause damage to the
equipment or other property.
Symbols in User's Manual
User's Manual System Controller C2 Version 4.0, 23.03.2006
© by André Figula, Kling & Freitag GmbH, 2003 - 2006; all rights reserved.
All specifications in this manual are based on information available at the time of pub-
lishing for the features and safety guidelines of the described products.
Technical specifications, measurements, weights and properties are not guaranteed.
The manufacturer reserves the right to make product alterations within legal provi-
sions as well as changes to improve product quality.
All persons who use the speaker system must have this guide and all further in-
formation for safe operations available to them during assembly, disassembly,
and use.
We appreciate any input with suggestions and improvements for this manual. Please
send this to us at the following address:
[email protected] or to:
KLING & FREITAG GMBH Junkersstr.14 D-30179 Hannover
Phone +49 (0) 511 - 96 99 70, Fax +49 (0) 511 - 67 37 94

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 4 of 33
Contents
Chapter Page
1. General Safety Instructions 5
2. Product Description 7
3. Connectors, Functions, Controls and Displays 9
3.1 Front 9
3.1.1 Diagram of switchable Filter Functions 11
3.2 Rear 11
4. C2 Remote Control 13
4.1 Example for Remote Control and Display 14
5. System Plug-In Cards 14
5.1 Notes for the System Plug-in Cards Line 212-6 and Line 212-9 14
5.2 Changing the System Plug-In Cards 15
6. Single Cable System 17
7. Operation with the Subwoofers K&F ACCESS B5 / B10 18
8. Recommendations for Configuration 18
8.1 Operating several Speakers per C2 Channel 18
8.2 The correct Balance between Bass and Top Speakers 19
8.2.1 SW 112 / SW 115D / SW 115E / SW 118E 19
8.2.2 SW 215E / SW 215D / ACCESS B5 / ACCESS B10 21
8.3 Combination of Bass System ACCESS B10 with C10 Controller 23
9. Wiring 24
9.1 Connecting the Speakon connectors to the terminal 24
9.2 Avoiding Ground Loops 25
9.2.1 What is a Ground Loop? 25
9.2.2 Avoiding Ground Loops 25
10. Configurations and Wiring Diagrams 26
10.1 Full Range Mode (without additional Subwoofer) 26
10.2 Full Range Systems & Subwoofers in 2-Way Active Mode 27
10.3 Combination with Subwoofer ACCESS B10 via Controller C10 28
10.4 Alternative Wiring without Frontal Connectors 29
11. Operating the Controller 30
12. Technical Specifications 31
13. Block Diagram 32
14. Regulations for Disposal 33
14.1 Germany: 33
14.2 EU, Norway, Island, and Liechtenstein (not Germany): 33
14.3 Other countries 33

User’s Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 5 of 33
1. General Safety Instructions
Warning: To avoid electric shock hazard, do not expose
this appliance to rain or moisture. The enclosures may
only be opened by qualified personnel!
Do not install devices in any of the following places:
−where the units are permanently exposed to direct sunlight.
−near any heat sources and open fire. Do not put candles etc. on top of the unit.
−where the airflow for cooling is blocked.
−where it is exposed to high moisture.
−where it is exposed to strong vibrations and dust.
Power Supply
Before connecting the AC power cable of the controller, please check if the available
voltage is compatible with the operating voltage as indicated on the unit. If this is not
the case, then the unit needs to be adapted by the manufacturer or an authorized
service centre. If the unit is not compatible with the available voltage, it should never
be connected! This could irreparably ruin the controller.
Make sure that the power outlet supplies a ground connector, which must be con-
nected to the unit via the PE conductor of the power cord!
All equipment, which is connected together using signal cables and has a connection
to protective earth, must be connected to a common PE conductor. If not, there is a
risk of an electric shock or the destruction of the connected equipment.
The power plug must always be used to disconnect from the power supply. Further-
more, the power plug must be easily accessible for use at all times.
Protection of electrical cables
Power cords should be laid in such a way that they are protected against footstep
damages, tensile strain and against being trapped.
Transportation
When transporting the equipment, make sure that it is protected from vibrations.
Cleaning
The equipment should only be cleaned with a damp cloth when it is not plugged in.
Pauses in use
The power cord should be disconnected from the power source during longer pauses
in use.
Intrusion of objects or liquids
No objects or liquids should intrude or leak into the equipment.
Warning
Risk of electric shock!
Do not open the units!
CAUTION

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 6 of 33
Maintenance and technical service
The user should not perform any maintenance work on the equipment other than
that which is described in this manual. Repairs should be executed by a qualified ser-
vice technician only.
In the following cases, the unit should be serviced by an authorized technician only if:
−the power cord or the mains connectors have been damaged.
−objects or liquids have gotten into it.
−it was exposed to rain.
−it doesn't appear to be functioning properly.
−it has fallen down or the enclosure is damaged.
Unwanted interference
RF interference on the power cord or on the line signal cables may lead to unwanted
sound interference.
Warning
Important

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2. Product Description
The C2 Controller optimises the performance and operating safety of K&F speaker
systems.
It can be equipped with a specific system plug-in card for the top speaker and a sepa-
rate system plug-in card for the subwoofer.
The C2 Controller can be operated with all K&F loudspeakers for which a system plug-
in card is obtainable:
The following system plug-in cards are available for the C2 Controller:
Top speakers:
−CA 106
−CA 1201
−CA 1215-6
−CA 1215-9
−CA 1515-6
−CA 1515-9
−Line 212-6
−Line 212-9
Subwoofer:
−SW(i) 112
−SW 115D-XO / SWi 115D
−SW(i) 115E / SW 215E
−SW(i) 118E
−SW 215D
−ACCESS B5
−ACCESS B10
All system plug-in cards for tops and subwoofers can be combined. The C2 Controller
thus facilitates an optimum combination between all these K&F bass systems and all
K&F full-range systems listed above.
Range of functions:
The C2 offers a 2-way stereo-crossover for separating the signal that is to be trans-
mitted into frequencies for mid-high systems (= top speaker or full-range system) and
frequencies for connected subwoofer systems (= sub or bass). It aligns the delay times
and phase of the various full-range systems with those of the subwoofer systems.
The inclusion of carefully balanced filters (EQs) on the respective system plug-in cards
enables the C2 Controller to optimise the feedback stability and frequency response
of the loudspeakers.
Why optimise the frequency response of passive high-end loudspeakers?
a) The passive Kling & Freitag full-range systems are characterized not only by their
excellent sound but also by their high degree of efficiency. Compact speaker sys-
tems with a high efficiency level have a natural low frequency attenuation. This is
desirable for the following reasons:
−In many situations, such as speech or acoustic applications, powerful bass is
of less importance than efficiency.
−In applications requiring a better reproduction of low frequencies the inclu-
sion of a bass system is normally inevitable. As the C2 Controller boosts the
bass frequencies of the top speakers in full-range mode, it is possible in many
cases to do without additional bass systems.
b) In full-range mode without C2 Controller mid-high systems also receive the low
frequencies of a signal source, which they are not capable of transmitting. The
systems are thus subjected to an unnecessary load. The C2 Controller filters out
these frequencies by means of subsonic filters, thus reducing the risk of mechani-
cal overload even at high performance levels.

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 8 of 33
In addition the C2 Controller offers the following functions:
−optional bass boosting in full-range mode (top speakers without additional sub-
woofers)
−top low cut switch, e.g. for…
… optimising the frequency response of arrayed speakers (cluster)
… optimising the frequency response in monitor mode
… impact noise reduction
−high-boost to compensate for high frequency attenuation when the top speakers
are aligned to cover large distances.
−Sub-mono, combining a stereo bass signal into one mono signal. Attenuation of the
individual stereo channels by 6dB so that the bass speakers are not subjected to an
increased load by the combined signal sum.
−Optimisation of the operating safety of speakers and power amplifiers through
special peak and RMS limiters with sense technology:
With other (universal) controllers, the gain of the selected power amplifiers must
be known. The limiter on the C2 Controller, on the other hand, uses a special
control circuit to determine the actual output voltage of the power amplifiers. The
limiter then reduces the input level only when the power amplifier actually pro-
vides more power than the speakers can handle. The amplifier's gain and the po-
sition of the input level control for the power amplifiers are insignificant for the
limiter function of the C2 Controller.
C2- Power amplifier with
Controller input level control
Limiter
Measured value
(Output voltage of
the power amplifier)
Universal Power amplifier with
controller input level control
Limiter
Fixed value, depending on the gain and the position of
input level controls of the power amplifier.

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3. Connectors, Functions, Controls and Displays
3.1 Front
CHANNEL 2 LINKCHANNEL 2 INCHANNEL 1 IN CHANNEL 1 LINK
CH1 TOP OUTCH1 SUB OUT CH2 TOP OUTCH2 SUB OUT
FULLRANGE
MODE
TOPHF
BOOST LOW CUT
GAIN
SUB
INPUT GAIN
C2
SYSTEM
CONTROLLER
CH2TOPSIGNAL
CH2TOPLIMIT
POWER
CH1TOPSIGNAL
CH1TOPLIMIT
SUB
MONO
CH1SUBSIGNAL
CH1SUBLIMIT
CH2SUBSIGNAL
CH2SUBLIMIT
23
1
45 7 9
11 13
15
8
6
10 12
14
1. CH 1 SUB OUT, and CH 2 SUB OUT
Speakon connectors, pin assignment: (1+ / 1-)
Channel 1 = CH 1, channel 2 = CH 2
These outputs direct the amplified signals from the power amplifiers to the sub-
woofers.
2. CH 1 TOP OUT and CH2 TOP OUT
Speakon connectors, pin assignment: (1+ / 1-)
Channel 1 = CH 1, channel 2 = CH 2
These outputs direct the amplified signals from the power amplifiers to the mid-
high systems.
3. CHANNEL 1 IN /CHANNEL 1 LINK and CHANNEL 2 IN /CHANNEL 2 LINK, XLR
connectors, pin assignment: 1 ground / 2 + / 3 -
Channel 1 = CHANNEL 1, channel 2 = CHANNEL 2
IN (XLR female): electronically balanced line inputs for channels 1 and 2.
These connectors are used to connect line signals,
e.g. from a mixer output.
LINK (XLR male): outputs for linking a line level signal, which is connected
to the corresponding 'IN’ connector, e.g. in order to direct
the signal to further controllers or power amplifiers.
The 'IN' and 'LINK' connectors are wired together in parallel.
Further parallel-wired input connectors are situated at the rear of the controller
and are labelled CH 1 INPUT and CH 2 INPUT.
4. INPUT GAIN, level control
The INPUT GAIN control is used to set the input level of the C2 Controller. The in-
put level can be increased by 6 dB and reduced by 40 dB. In order to avoid over-
loading the input section of the amplifier or the mixer output circuit, this control
should normally be set at 0 dB.
Turning down the input level controls may not always prevent distortions in the in-
put section of the power amplifier, especially if this section has a relatively low
headroom. To prevent signal interruptions or damages to the speakers, turn the le-
vel controls of the power amplifier to the maximum position, if possible and adjust
the signal level on the mixing console or the controller.
5. SUB GAIN, level control (also see as of chapter 8, page 18)
During operation with additional bass systems it is very important that the relative
volume levels of the top speakers and the bass systems are correctly balanced. The
SUB GAIN control is used to adjust these volume levels. Always use the controller to
set the relative volume levels of the tops and bass systems, with the power amplifier
turned up as high as possible. Detailed advice on how the level adjustment
Detailed advice on how the level adjustmentDetailed advice on how the level adjustment
Detailed advice on how the level adjustment
should be set to suit various loudspeaker combinations can be found as of
should be set to suit various loudspeaker combinations can be found as ofshould be set to suit various loudspeaker combinations can be found as of
should be set to suit various loudspeaker combinations can be found as of
chapter
chapterchapter
chapter 8
88
8, page
, page, page
, page 18
1818
18.
..
.

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6. HF BOOST, switch (see also diagram in section 3.1.1)
Long-distance function for the top speakers. High frequencies are attenuated
heavily by the air when travelling over long distances. In order to compensate for
such high frequency attenuation in long-distance applications this push-button
switch should be pressed. If it is not, then a linear frequency response for near-
field conditions will result.
7. TOP LOW CUT, switch (see also diagram in section 3.1.1)
Attenuation of low frequencies in the mid-high system in order to …
−... compensate increased acoustic pressure in the low-mid range due to the
speaker's positioning. When using arrayed loudspeakers (cluster), improved
performance is achieved when the Top Low Cut push-button switch is pres-
sed. In this mode the increase in acoustic pressure in the low-mid area due to
the cluster array is counteracted, producing a practically linear frequency re-
sponse.
−… align frequency response in monitor mode.
−… reduce pop-noises in speech applications.
8. FULL RANGE MODE, switch (see also diagram in section 3.1.1)
Countersunk switch for selecting the modes:
a) 'FULL RANGE MODE' (switch pressed)
The entire frequency spectrum, with the exception of the inaudible infra-bass,
is handled by the tops, with the frequency response optimised and the bass
frequencies boosted.
b) '2-WAY ACTIVE MODE' (switch not pressed)
Mode for operation with additional subwoofers. Operation via 2-way stereo
crossover for separating the signal into frequencies for the mid-high systems
and frequencies for the connected subwoofer systems. By activating addi-
tional filters the group delay and phase response of the low and mid-high sys-
tems are aligned. This facilitates an optimum acoustic coupling of all K&F bass
systems to all K&F full-range systems.
9. FULL RANGE MODE, display
LED illuminated in ’FULLRANGE’ mode, switch (8.) pressed.
If this LED does not come on, then the ’2-WAY ACTIVE MODE’ is selected.
10. SUB MONO, switch
Countersunk switch for selecting the modes: ’SUB MONO’ / ’SUB STEREO’. In
’SUB MONO’ mode the bass signal is reduced to a mono signal. The amplified
mono signal for the loudspeakers can be extracted from both SUB OUT output
sockets (1. &. 3.). The signal from the individual stereo channels is reduced by 6
dB so that the bass speakers are not subjected to an increased load by the com-
bined signal sum.
11. SUB MONO, display
This LED is illuminated in ’SUB MONO’ mode (switch pressed).
If this LED does not come on, then the ’SUB STEREO-MODE’ is selected.
12. SIGNAL LEDs, display
These LEDs are illuminated when power amplifiers are connected and their out-
put signals are received by the C2 Controller.
In exceptional cases, the Sense LEDs may still light up even when the po-
wer amplifiers are turned off or disconnected. This situation can be at-
tributed to the ‘‘microphone effect’’ of the speakers. If the speaker's cones
are moved (i.e. from air movement of other sound sources), the speakers
produce voltage which may cause the LEDs to light up.

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13. LIMIT LEDs,display
These LEDs are illuminated as soon as the output level of the relevant channel
comes under the influence of the limiters on the controller. A gently engaging
RMS limiter and a fast peak limiter limit the output of the power amplifiers virtu-
ally inaudibly to the maximum permitted level. If the red limiter LEDs light up fre-
quently the volume should be reduced accordingly. If necessary, further loud-
speakers should be added.
14. POWER,display
This LED illuminates as soon as the unit is connected to the mains supply.
15. LABELLING AREA
An interchangeable label provides information regarding the configuration of the
filter cards in use.
3.1.1 Diagram of switchable Filter Functions
100 1000 10000
-30
-20
-10
0
10
Full Range
Top Low Cut @ Full Range
2-Way
Top Low Cut @ 2-Way
High Boost
Diagram of the filter settings FULL RANGE, TOP LOW CUT, HF BOOST. Differences
between the various models arise due to individual filter cards.
3.2 Rear
CH2 SUB AMP
REMOTE CONTROL
240V / 50Hz
CE
FUSE: 100mA / SLOW BLOW MADE IN GERMANY
SER No.
SYSTEM CONTROLLER
-LF+
CH1 TOP AMPCH1 SUB AMPCH2 TOP AMP CH1 INPUT
GND
LIFT CH2 INPUT
-HF+
C2
-LF+-LF+ -HF+ -LF+
AMP RETURN CH2 AMP RETURN CH1
16 17
18
19 20 21 22
16. AC Mains Socket, IEC power socket 230V 50-60Hz / 115V 50-60Hz.
Connect this socket using the mains cable supplied to a mains outlet. Pay atten-
tion to the stated mains voltage. Connection to an incorrect mains voltage can
result in irreparable damage!
17. REMOTE CONTROL, mini D-Sub socket (for details see chapter 4, as of page 13)
Connection for remote call-up of: 'Signal Present', 'Limit', 'Power On' and remote
control of all output levels. A detailed description can be found in chapter 4.
Important

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18. CH 1 SUB AMP and CH 2 SUB AMP
XLR connector, pin assignment: 1 ground / 2 + / 3 -
Channel 1 = CH1, channel 2 = CH2
Electronically balanced line signal outputs. These outputs deliver the line signal
processed by the controller to the subwoofers. Connect these sockets to the in-
puts of the power amplifiers for the subwoofers.
19. CH 1 TOP AMP and CH 2 TOP AMP
XLR connector, pin assignment: 1 ground / 2 + / 3 -
Channel 1 = CH1, channel 2 = CH2
Electronically balanced line signal outputs. These outputs deliver the line signal
processed by the controller to the mid-high systems. Connect these sockets to
the inputs of the power amplifiers for the mid-high systems.
20. GND LIFT, switch
For avoiding ground loops. Separates the signal ground from the power supply
earth. The Ground Lift switch serves to avoid ground loops. When the Ground
Lift switch is set at LIFT, Pin 1 of the INPUT connector is not connected to the
signal source. A connection always exists between the input connector (XLR fe-
male) and the link connector (XLR male).
21. CH 1 INPUT and CH 2 INPUT
XLR female connectors, pin assignment: 1 ground / 2 + / 3 - .
Channel 1 = CH1, channel 2 = CH2
Additional electronically balanced line signal inputs. These input connectors are
wired in parallel to the connectors CHANNEL 1 IN /CHANNEL 1 LINK and
CHANNEL 2 IN /CHANNEL 2 LINK on the front of the unit.
22. AMP RETURN CH 1 and CH 2 (input impedance 220 kOhm)
Connector for Phoenix plugs MSTB 2,5/6-ST5, 08 / Ord.No: 17 57 05 1 VO
These connectors are for connecting the amplified output signals from the power
amplifiers (loudspeaker signal).
The amplified signal from the bass power amps must be distributed to four
pins (2 x LF+ und 2 x LF-), as the permitted current load capacity might oth-
erwise be exceeded! The two inputs have no significance for stereo opera-
tion!
The amplified output signals connected here are directed to the relevant Speakon
loudspeaker connectors at the front of the unit. LF to SUB OUT / HF to TOP OUT.
These signals are required by the limiters (sense signal).
Please ensure that all is connected correctly. These inputs are electronically bal-
anced.
When using ’SP’ speakers nothing may be connected to these connectors as
these speakers have built-in limiters.
There are some makes of power amplifiers which have a DC voltage to
earth potential from the positive and negative pins of the speaker outputs.
In such cases the connection must be made via capacitors. More details can
be found in the manuals of the power amps in question. The input imped-
ance of the C2 Controller is 220 kOhm.

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4. C2 Remote Control
The Sub-D connector at the rear of the C2 Controller offers the facility of remote
control of the functions listed below and / or the calling-up of status information.
The Sub-D connector is not intended for connection to a computer. The contacts
provide only analogue control and status signals.
25-pin Sub-D pin assignment:
Pin Label Input Output For
1 GND
2 Top Signal Channel 1 X
for display, e.g. LED
3 Top Limit Channel 1 X
for display, e.g. LED
4 GND
5 Top Signal Channel 2 X
for display, e.g. LED
6 Top Limit Channel 2 X
for display, e.g. LED
7 Minus 8,75V
level boost (control voltage source)
8 GND
9 GND
10 GND
11 GND
12 GND
13 GND
14 GND
15 Sub Signal Channel 1 X
for display, e.g. LED
16 Sub Limit Channel 1 X
for display, e.g. LED
17 GND
18 Sub Signal Channel 2 X
for display, e.g. LED
19 Sub Limit Channel 2 X
for display, e.g. LED
20 Plus 8,75V
level attenuation (control voltage source)
21 Sub Level Channel 1 X
potentiometer (control voltage)
22 Top Level Channel 1 X
potentiometer (control voltage)
23 Sub Level Channel 2 X
potentiometer (control voltage)
24 Top Level Channel 2 X
potentiometer (control voltage)
25 Master Level X
potentiometer (control voltage)
Voltage at LED outputs (via 1k2 resistor)
−inactive (no signal and no limiting) = +12V
−active (signal and limiting) = -12V
Inputs for potentiometers / control voltage
−Positive voltage (+8.75 V from pin 20) reduces the relevant output signal by 9dB
per volt. With a 10k potentiometer between GND and pin 20 and the slider con-
tact on the control input of a level channel (sub, top or master) a control range of
0 - 80dB can be achieved.
−Negative voltage (pin 7) boosts the signal by 9dB per volt. The boosting of the
signal should be approached with the utmost care. An excessive signal can destroy
power amplifier and speakers.

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4.1 Example for Remote Control and Display
1. Bi-coloured LED between pin 2 (top signal channel 1) and GND
−Colour 1 indicates that the C2 Controller is ready for operation
−Colour 2 indicates that the ’top signal’ is present at channel 1
2. LED between pin 15 (sub signal channel 1) and GND
−LED indicates that the ’sub signal’ is present at channel 1
3. Potentiometer (10k) at pin 20 (control voltage source for signal attenuation),
pin 25 (master volume) and GND
−The master volume can be adjusted within a control range of 0 - 80 dB.
5. System Plug-In Cards
5.1 Notes for the System Plug-in Cards Line 212-6 and Line 212-9
During the development of the Line Series particular care was taken so that the parallel
operation of Line 212-6 and Line 212-9 can be guaranteed.
Thus it is also possible to operate the Line 212-9 using a Line 212-6 card.
Should you however wish to cover only shorter distances and operate the Line 212-9
alone, we would recommend for best results the use of a Line 212-9 card.
If you are using the Line 212-9 alone with a '-6' card we recommend that you reduce
the frequency around 16 kHz Q2 by 2 dB.

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5.2 Changing the System Plug-In Cards
Tool: Cross-tip screwdriver, size PH 1
−Remove the mains plug!
−Remove the cover from the top of the housing using a Phillips screwdriver to re-
move the 7 cover screws (three screws at the back and two on each side).
−Remove the screws securing the cards. The card for the bass system is the small one
and is secured with two screws. The large card for the tops is secured with 4
screws.
−Extract the installed card from the controller by carefully pulling it vertically up-
wards. Keep it in a safe place where it is not exposed to moisture or mechanical
damage.
−We advise that the bass card be inserted first. Ensure that the pins fit exactly into
the connector. Insert the card initially only so far, so as to make sure that the pins fit
correctly into the openings of the connector. Then press the PCB firmly home, tak-
ing care not to bend the pins.
−Now insert the card for the top speakers. Here too extreme care should be taken:
Start with the right-hand side. This is the side on which the end of the PCB is flush
with the black connector. First fit this side carefully onto the pins. Do not yet press
the PCB firmly into place.
Warning
bass filter card
top filter card
connector
top card

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−Now fit the connector on the left-hand side onto the pins.
Then press the filter card board firmly onto the pins.
Screw the filter cards on tightly again!
Finally screw the cover of the housing back on. In order to protect the thread of the
securing screws from damage, please proceed as follows:
Set the screws in position and applying only light pressure turn them anti-clockwise
until you hear a click and the screw jumps forward a little. You have found the be-
ginning of the thread. Now tighten the screws as normal in a clockwise direction.
1.) 2.)

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6. Single Cable System
If you wish to operate the C2 Controller with a 'single cable system' (connecting pins
1+/1- for tops and 2+/2- for the bass systems), a modification inside the housing is nec-
essary.
The single cable system does not function with the models ACCESS B5 / B10. The rea-
son for this is that these bass systems have two chassis, each with its own connecting
pins for the input connectors. This means one chassis with 1+/1-, the other with 2+/2-.
Thus all available pins are already in use. For more information on this subject see the
next chapter.
To convert to a single cable system please proceed as follows:
−Disconnect the mains plug!
−Remove the cover from the top of the housing using a Phillips screwdriver (size PH
1) to remove the 7 cover screws (three screws at the back and two on each side).
−Attach the jumper wires (available from Kling & Freitag) to the connections behind
the Speakon connectors. See illustration below.
−Finally screw the cover of the housing back on. In order to protect the thread of the
securing screws from damage, proceed as described in chapter 5.2 .
KLING &
CH2 TOP OUTCH1 TOP OUTCH1 SUB OUT
1 -
1+
2
-
2+
SOUND SYSTEMS
FREITAG
CH2 SUB OUT CHANNEL 1 IN
1 -
1+
2
-
2+
1
-
1+
2
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2+
1
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Warning

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 18 of 33
7. Operation with the Subwoofers K&F ACCESS B5 / B10
The subwoofer systems ACCESS B5 and B10 each have two loudspeaker chassis, each
of which has its own connection pins to the input connectors. Therefore the jumper
wires must be installed in the C2 Controller before use. The following measures should
be taken inside the open housing of the C2:
−Disconnect the mains plug!
−Remove the cover from the top of the housing using a Phillips screwdriver to re-
move the 7 cover screws (three screws at the back and two on each side).
−Attach the jumper wires shipped with the B5 / B10 filter card to the connectors
behind the Speakon connectors. See illustration below.
−Finally screw the cover of the housing back on. In order to protect the thread of the
securing screws from damage, proceed as described in chapter 5.2 .
KLING &
CH2 TOP OUTCH1 TOP OUTCH1 SUB OUT
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SOUND SYSTEMS
FREITAG
CH2 SUB OUT CHANNEL 1 IN
1 -
1+
2
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2+
1
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8. Recommendations for Configuration
8.1 Operating several Speakers per C2 Channel
The maximum number of speakers which can be operated at one time using the C2
Controller is limited by the minimum output impedance of the power amplifiers.
We recommend not more than 2 x 8 Ω loudspeakers per C2 Controller channel.
When operating in stereo this means: a maximum of 4 x 8 Ω top speakers and a
maximum of 4 x 8 Ω bass speakers.
Should you wish to include more speakers on one channel, please observe the minimum
output impedance of the power amplifier and make sure the power amplifier has suffi-
cient headroom.
No further adjustments need to be made to the C2 Controller when operating with
several speakers connected to a single controller. There is no need to adjust the limiters.
They receive the necessary information via the voltage applied (not via the current).
Warning
Important

User’s Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 19 of 33
8.2 The correct Balance between Bass and Top Speakers
When setting up the system it is very important to ensure that the volume levels of the
tops and bass systems are correctly balanced.
The sound level of arrayed bass speakers increases by max. +6dB when doubling the
number of speakers (+3dB efficiency plus 3dB by doubling the power amplifier level).
The loudness of the tops increases in a different manner because of the directivity.
A bass speaker which is on the floor can be a few decibels louder than a flown bass
system because of the floor reflections.
The SUB GAIN control on the C2 Controller facilitates the correct setting of this balance
according to configuration and application.
The following tables are intended to show the basic principles of setting this
balance in various configurations.
The data given apply to bass systems placed on the floor and are valid on the condition
that all systems are driven by identical power amps with the signals set at the same level
(we recommend maximum level).
When using power amps with vastly different gain characteristics it can become neces-
sary to adjust the balance between top and bass system using the volume controls of
the power amplifier. We recommend however that this be done only when the level
adjustment on the C2 Controller proves insufficient. When using this method it cannot
be ruled out that the input circuit of the power amp is subjected to overload.
Depending upon room acoustics the correct setting may well differ in practice from that
given here. For this reason the sound engineer should always carry out a fine adjust-
ment using the SUB GAIN control.
8.2.1 SW 112 / SW 115D / SW 115E / SW 118E
Prerequisite:
−identical power amps for tops and bass systems with each power amp set at the
same volume.
−bass systems placed on the floor
1 x subwoofer with 2 top speakers 1 x subwoofer with 4 top speakers
2 x CA 1201 4 x CA 1201
2 x CA 1215 4 x CA 1215
2 x CA 1515 4 x CA 1515
TOP TOP
SUB
2 x CA 106
2 x Line 212
TOP TOP
TOP TOP
SUB
4 x CA 106
4 x Line 212
1 x SW 112 1 x SW 112
1 x SW 115D /
SW 115E
1 x SW 115D /
SW 115E
1 x SW 118E
+6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
Only recom-
mended for
applications
with low bass
level required 1 x SW 118E
+6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
Only recom-
mended for
applications
with low bass
level required
SUB
MONO
Sub Mono switch
pressed / LED on
Top Low Cut switch
not pressed
SUB
MONO
Sub Mono switch
pressed / LED on
Top Low Cut
switch pressed

User's Manual System Controller C2
KLING & FREITAG GMBH ©2003 - 2006 Version 4.0, 23.03.2006 Page 20 of 33
2 x subwoofers (stereo) with 2 top speakers 2 subwoofers (stereo) with 4 top speakers
2 x CA 1201 4 x CA 1201
2 x CA 1215 4 x CA 1215
2 x CA 1515 4 x CA 1515
TOP TOP
SUB SUB
2 x CA 106
2 x Line 212
TOP TOP
TOP TOP
SUB SUB
4 x CA 106
4 x Line 212
2 x SW 112 2 x SW 112
2 x SW 115D /
SW 115E
2 x SW 115D /
SW 115E
2 x SW 118E
0 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
+6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
2 x SW 118E
+6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
Only recom-
mended for
applications
with low bass
level required
SUB
MONO
Sub Mono switch not
pressed / LED off
Top Low Cut switch
not pressed
SUB
MONO
Sub Mono switch not
pressed / LED off
Top Low Cut
switch pressed
4 subwoofers (stereo) with 2 top speakers 4 subwoofers (stereo) with 4 top speakers
2 x CA 1201 4 x CA 1201
2 x CA 1215 4 x CA 1215
2 x CA 1515 4 x CA 1515
TOP TOP
SUB SUB
SUB SUB
2 x CA 106
2 x Line 212
TOP TOP
TOP TOP
SUB SUB
SUB SUB
4 x CA 106
4 x Line 212
4 x SW 112 4 x SW 112
4 x SW 115D /
SW 115E
4 x SW 115D /
SW 115E
4 x SW 118E
-6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
0 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
4 x SW 118E
0 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
+6 dB
-1
-2 2
-3 3
-5 5
-6 6
SUB
GAIN
1
0dB
SUB
MONO
Sub Mono switch not
pressed / LED off
Top Low Cut switch
not pressed
SUB
MONO
Sub Mono switch not
pressed / LED off
Top Low Cut
switch pressed