CS 2 - Conference system AKG - Free user manual and instructions

USER MANUAL CS 2 AKG

1 Safety and Environment 12

1.1 Safety. 12
1.2 Environment 13

2 Description. 13

2.1 Introduction 13
2.2 Unpacking 13
2.3 Optional Accessories 13
2.4 CS 2 BU Base Unit. 13

2.4.1 Front Panel 13
2.4.2 Rear Panel 14

2.5 Microphone Stations 14

2.5.1 Top Panel 15
2.5.2 Bottom Panel 15

Block Diagram 63

3 Setting Up 16

3.1 Base Unit(s) 16
3.1.1 Setting up the Base Unit(s) 16
3.1.2 Connecting Several Base Units Together 16
3.1.3 Connecting Remote Controls and Indicators 16
3.1.4 Connecting an Equalizer or Feedback Killer 16
3.1.5 Connecting other External Devices 16

3.2 Microphone Stations 16

3.2.1 Setting up Microphone Stations. 16
3.2.2 Installing "CS 2 DU fix" and CS 2 CU fix" Microphone Stations . 17
3.2.3 Connecting Microphone Stations 17
3.2.4 Connecting Microphones 18

3.3 Connecting to Power 18

4 Operating Notes. 19

4.1 Powering Up 19
4.2 Powering Down 19
4.3 Setting NOM Limitation 19
4.4 Activating and Deactivating Microphones (Voice Activation and Automute) 19
4.5 Setting Loudspeaker Levels 19
4.6 Setting Voice Zoom 19
4.7 Notes on Using Microphone Stations 19
4.8 Replacing Internal Fuses 20

5 Cleaning 20
6 Troubleshooting 20

7 Specifications 21

7.1 CS 2 BU Base Unit. 21
7.2 CS 2 DU / CS 2 CU Microphone Stations 21

1 Safety and Environment

1.1 Safety

1. Do not spill any liquids on the equipment and do not drop any objects through the ventilation slots in the equipment.
2. The equipment may be used in dry rooms only.
3. The equipment may be opened, serviced, and repaired by authorized personnel only. the equipment contains no user-serviceable parts.
4. Before connecting the equipment to power, check that the AC mains voltage stated on the supplied AC adapter is identical to the AC mains voltage available where you will use the equipment.
5. Operate the equipment with the supplied CS PS 20 or CS PS 100 power supply with a secondary voltage of 23 to 36 VDC only. Using power supplies with an AC output and/or a different output voltage may cause serious damage to the unit.
6. If any solid object or liquid penetrates into the equipment, shut down the sound system immediately. Disconnect the power cable from the power outlet immediately and have the equipment checked by AKG service personnel.
7. If you will not use the equipment for a long period of time, disconnect the power cable from the power outlet. Please note that the equipment will not be fully isolated from power when you set the power switch to OFF.
8. Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. and do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock.
9. To avoid hum or interference, route all audio lines, particularly those connected to the microphone inputs, away from power lines of any type. If you use cable ducts, be sure to use separate ducts for the audio lines.

10. Clean the equipment with a moistened (not wet) cloth only. Be sure to disconnect the power cable from the power outlet before cleaning the equipment! Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since these may damage the enamel and plastic parts.

11. The CS PS 20 power supply will draw a small amount of current even when the equipment is switched off. To save energy, disconnect the power cable from the power outlet if you will leave the equipment unused for a long period of time.

12. When scrapping the equipment, separate the case, circuit boards, and cables, and dispose of all components in accordance with local waste disposal rules.

1.2 Environment

2 Description

Thank you for purchasing an AKG product. This Manual contains important instructions for setting up and operating your equipment. Please take a few minutes to read the instructions below carefully before operating the equipment.

Please keep the Manual for future reference.

The CS 2 Conference System from AKG provides excellent audio quality and uses single-cable technology for easy installation. The system is fully modular so you can easily design a conference system that meets your customer's requirements. You can choose from various connecting cables, desktop or flushmount Microphone Stations, power supplies, goosenecs, and microphone capsules.

The CS 2 BU Base Unit powers and controls up to 200 Microphone Stations. For systems with up to 40 Microphone Stations you will need a CS PS 20 power supply, while a CS PS 100 power supply can power systems with up to 200 Microphone Stations.

Both the CS 2 CU Chair Station and the CS 2 DU Delegate Station provide a patented screw-on connector for a GN 30 CS (12-in./30-cm) or GN 50 CS (20-in./50-cm) gooseneck. You can connect to the goose-neck any one of five different Discreet Acoustics Series microphone capsules from AKG.

Check that the shipment contains all of the seven components listed below in the quantities you ordered. Should anything be missing, please contact you local AKG Distributor.

1. CS 2 BU Base Unit
2. Power supply: CS PS 20 or CS PS 100
3. Power cable: CS MK AC-EU, CS MK AC-US, or CS MK AC-UK
4. Microphone Stations: CS 2 DU, CS 2 DU fix, CS 2 CU, or CS 2 CU fix
5. Connecting cables: CS MK 1.25 fm, CS MK 2.5 fm, CS MK 5 fm, CS MK 10 fm, or CS MK 20 fm
6. Goosenecks: GN 30 CS or GN 50 CS
7. Microphone capsules: CK 31, CK 32, CK 33, CK 47, or CK 80

2.1 Introduction

2.2 Unpacking

For a list of optional accessories for the CS 2 Conference System and their order numbers refer to sections 7.1 and 7.2 on page 21.

MIC DELEGATES LEVEL: This rotary control sets the level of all microphones.

LINE LEVEL: This rotary control sets the level of the balanced LINE INPUT for external audio sources.

AUX LEVEL: This rotary control sets the level of the unbalanced AUX input.

ACTIVE MICS: The blue LEDs 1 through 4 illuminate to indicate the microphone on one of the Microphone Stations is open. If more than five microphones are open simultaneously, LED 5 will illuminate.

NOM LIMITATION: The NUMBER OF OPEN MICROPHONES rotary control sets the maximum number of microphones that may be open at any time. The red LIMIT LED will illuminate every time the number of open microphones reaches the limit you set.

OPERATION MODE: Pushing this button IN places the Base Unit in Voice Activation mode. A microphone channel will become active as soon as the microphone is talked into. The VOICE ACTIVATION LED lights to indicate the Base Unit is in Voice Activation mode.

As long as the button is OUT, microphones can only be activated by pressing the PTT switch on the appropriate Microphone Station. In this mode, the VOICE ACTIVATION LED will be dark.

ERROR: This red LED illuminates to indicate that one of the fuses on Microphone Station lines LINE 1 through LINE 4 or the fuse on the motherboard has blown. For details refer to section 4.8.

SPEAKERS OUT: This rotary control sets the maximum volume level of the built-in loudspeakers and the maximum headphones level on ALL Microphone Stations.

BALANCED OUT: This rotary control sets the level of the balanced LINE OUTPUT.

HEADPHONES OUT: This rotary control sets the volume level of the headphone output.

: 1/4" jack for connecting a pair of headphones.

POWER: Switches power to the Base Unit on ("I") and of ("0").

ON: This green LED illuminates to indicate that power to the Base Unit is ON.

2.3 Optional Accessories

2.4 CS 2 BU Base Unit

2.4.1 Front Panel

Refer to fig. 1.

Note: The ON LED will illuminate about 2 seconds after you switched the power on. During this time, the supply voltage is internally stabilized.

2.4.2 Rear Panel Refer to fig. 2.

EXPANSION IN/OUT: These two 8-pin Mini DIN jacks (also known as Hosiden or S-VHS connectors) allow you to connect several Base Units together if you need to install a system with more than 200 Microphone Stations. To connect two Base Units, you will need an optional IC AS 8 expansion cable and AWG 20 (0.5mm^2) or heavier wire to connect the 0V terminals on the two Base Units together. The Base Unit with a cable connected to EXPANSION OUT only is automatically detected as the master whose POWER switch turns power to the master and all slave Base Units on and off. The audio signals of all Base Units are summed and routed to the LINE output connectors on all Base Units. However, the control signals for NOM limitation, priority, etc. are not summed. Therefore, each Base Unit only controls the Microphone Stations connected to it. You can also use the EXPANSION jacks to connect a remote on/of switch or other remote controls or indicators. For details, refer to section 3.1.3.

LINE OUTPUT: This transformer balanced 3-pin XLR connector (pin 2 hot) provides the summed output signal of all input channels. Its nominal level is 0 dBu and the output level can be set with the front panel BALANCED OUT control.

REC OUT L/R: These two RCA jacks provide the same unbalanced mono signal for cassette deck or other recording devise. The signal at the REC OUT jacks is the summed output signal of all input channels. The red trimmer pot to the left of the REC OUT jacks sets the output level of the two jacks. The REC OUT level setting is not affected by the front panel OUTPUT CONTROL section controls.

AUX IN L/R: These two RCA jacks let you connect an audio source such as a CD player for important messages. Stereo input signals will be summed to mono.

Note: Signal present at the AUX IN jacks will NOT mute the microphones.

EFFECT: This 1/4" TRS jack allows you to insert an outboard equalizer or feedback killer into the signal path to reduce the risk of feedback in acoustically difficult rooms. Note the pinout of the insert: Tip: Return Ring: Send Shaft: Ground

LINE INPUT: This balanced 3-pin XLR connector (pin 2 hot) lets you connect any transformer balanced line level audio source, e.g., a video codec or a wireless microphone system.

DELEGATE UNITS/LINE 1-4: You can connect up to 50 Microphone Stations to each of the 15-pin D-Sub connectors LINE 1 though LINE 4. The type and number of power supplies you will need depends on the total number of your Microphone Stations and the overall length of connecting cables must not exceed 330 feet (100 m) per LINE connector. The red ERROR LED next to each LINE connector illuminates to indicate the internal fuse (T4A slow-blow) on the appropriate interface has blown. For details refer to section 4.8.

Table 1: 15-pin D-Sub pinout and connecting cable color code.

Pin No.	Color	Function
1	PINK	Power, 23 to 36V
2	RED	Power, 23 to 36V
3	GREY	Ground 0V
4	BLUE	Ground 0V
5	EXTERNAL SHIELD	Shield
6	GREEN	NOM limitation
7	YELLOW	Active mic detection
8	GREEN/YELLOW SHIELD	Active mic detection
9	WHITE GREEN	Priority
10	BROWN GREEN	Voice Activation
11	WHITE	Speech signal inphase
12	BROWN	Speech signal return
13	WHITE/BROWN SHIELD	Shield
14	BLACK	Loudspeaker inphase
15	VIOLET	Loudspeaker return

ERROR Σ: This red LED illuminates whenever the front panel ERROR LED illuminates. If only these two LEDs and none of the EROR LEDs next to the LINE connectors illuminate the fuse on the motherboard (T1A slow-blow) has blown. For details refer to section 4.8.

GND/0V: This jumper connects chassis ground to the rack. Remove the jumper to interrupt ground loops.

DC INPUT: 4-pin Phoenix connector for one or two power supplies, depending on the number of Microphone Stations your system uses.
Terminals 0V1 and +1 power the Microphone Stations connected to LINE 1 and LINE 2, terminals 0V2 and +2 the Microphones Stations on LINE 3 and LINE 4.

2.5 Microphone Stations

The CS 2 DU Delegate Station and CS 2 CU Chair Station provide basically the same functions and controls. In addition, the Chair Station features a priority button for muting all other microphones.

Microphone input: Gold plated, threaded mini jack for connecting a GN 30 CS or GN 50 CS goose-neck with a Discreet Acoustics Series microphone capsule.
+/-: These two keys set the volume level of the built-in loudspeakers in 31 steps. "+" increases and "-" decreases the volume. The last "-" position (-82 dB) is equivalent to OFF. To prevent feedback, the built-in loudspeakers are muted automatically whenever the microphone comes on.
These two mini jacks allow you to connect two pairs of headphones. The built-in loudspeakers are automatically muted as soon as you connect a pair of headphones. The headache signal, however, is NOT muted when the microphone comes on. (Normally there is no risk of feedback from the headphones to the microphone.)
PTT switch and status LED: The red PTT switch activates and deactivates the microphone. When NOM Limitation is active, the microphone will not come on unless the number of microphones already open is lower than the limit you have set. The status LED will illuminate for as long as the microphone is open.
Priority button (CS 2 CU only): The chairperson can mute all open microphones and activate the microphone on the Chair Station by pressing and holding down the black priority button. As soon as the chairperson releases the priority button, the microphone on the Chair Station will be muted and all other microphones can be activated again.
Connectors: Each Microphone Station provides two 15-pin male D-Sub connectors for connecting the microphone Station to the Base Unit and/or other Microphone Stations.
Dip switches 1-8: The dip switches are located beneath a removable cover and set the following functions:

Table 2: Dip switch functions.

Switch No.	Function	Switch Position
		OFF (1-8)	ON
1	Gate threshold	High	Low
2	Hold time	12 secs.	6 secs.
3	Auto mute	Active	Inactive
4	NOM Limitation	Inactive	Active
5	Voice Activation	Inactive	Active
6	Chairperson override	Inactive	Active
7	Compression	Active	Linear
8	Loudspeaker level memory	Active	Inactive

2.5.1 Top Panel

Refer to fig. 3 (CS 2 CU shown).

2.5.2 Bottom Panel

Refer to fig. 4.

Trimmer pot A: Sets the input sensitivity.

Trimmer pot B: Sets the Voice Zoom compression ratio.

Trimmer pot P3: Sets the Microphone Station output level. The output level has been factory preset for optimum matching to the CS 2 BU Base Unit. Be sure not to change the setting of P3 because mismatching may cause system malfunction.

Important! Set up the Base Unit(s) and Microphone Stations, install all 19" components (CS 2 BU Base Unit(s), CS PS 100) in your rack, and make all audio and expansion connections before connecting your system to power.

3.1 Base Unit(s)

3.1.1 Setting up the Base outboard equalizer or feedback killer. As delivered, the internal EQ affects the built-in loudspeakers on all Unit(s) Microphone Stations and the insert is ahead of the LINE OUTPUT.

Three jumpers inside the Base Unit let you change this configuration:

Refer to fig. 5.

1. Remove the fixing screws of the Base Unit top panel.
2. Remove the top panel.
3. Place the jumpers for the desired configuration:

Jumper	Position	EFFECT affects:	Internal EQ affects:
X9	1-1 (factory preset)	LINE OUTPUT	--
	2-3	--	--
X10	1-2	Built-in Microphone Station loudspeakers	--
	2-3 (factory preset)	--	--
X7	1-2 (factory preset)	--	Built-in Microphone Station loudspeakers
	2-3	--	--
X10	1-2	Built-in Microphone Station loudspeakers (EFFECT and internal EQ in series)
X7	1-2

Table 3: Internal jumpers.

Note: If you place both X10 and X7 in position 1-2, the external device and the internal EQ will be connected in series and both affect the built-in loudspeakers.

1. Screw the top panel back on the Base Unit case.

3.1.2 Connecting Several Base Units Together

Refer to fig. 6.

1. Use an IC AS 8 optional expansion cable to connect the EXPANSION OUT jack on the first Base Unit (the master) to the EXPANSION IN jack on the second Base Unit (the slave).
   The Base Unit with a cable connected to EXPANSION OUT only is automatically detected as the master whose POWER switch turns power to the master and all slave Base Units on and off.
2. Use another optional IC AS 8 expansion cable to connect EXPANSION OUT on the second Base Unit to EXPANSION IN on the third Base Unit (and so on).
3. Use AWG 20 (0.5mm^2) or heavier wire to connect the 0V terminals on all Base Units together in series.

3.1.3 Connecting Remote

Controls and Indicators

Refer to fig. 7.

You can use EXPANSION IN or EXPANSION OUT to connect a remote on/off switch and other controls or indicators to the Base Unit. If you use several Base Units in a master/slave configuration, you can only use EXPANSION IN on the master unit.

EXPANSION pinout:

Pin 2: Remote on/off. As long as pin 2 is connected to DC INPUT 0V1 or 0V2, power to the Base Unit is ON.

Pins 3+4: ERROR. If any internal fuse blows, pins 3 and 4 will be shorted. Connect your ERROR indicator to pins 3+4. Connect your ERROR indicator to pins 3+4.

Pins 7+8: PRIORITY. Pin 7 carries a +23 to +36 VDC supply voltage (depending on power supply configuration) for a remote lamp, relay, etc. (EXPANSION OUT only! Pin 7 on EXPANSION IN is not used.) As long as the priority button is held down on any Chair Station, pin 8 will be tied to 0V. Connect your relay etc. to pins 7+8.

Important! All other pins are used exclusively for connections between Base Units. To prevent damage to the Base Unit, do not connect any remote devices to these pins.

3.1.4 Connecting an Equalizer or Feedback Killer

You can use a Y cable (not supplied) to connect an equalizer or feedback killer to the EFFECT insert jack on the rear panel of the Base Unit.

EFFECT pinout:

Tip: Return

Ring: Send

Shaft: Ground

3.1.5 Connecting Other External Devices

Connect your other external equipment to the appropriate ins and/or outs. Examples: External sound system to LINE OUTPUT; recording device to REC OUT; CD player to AUX IN; wireless microphone system (e.g., WMS 81 or WMS 40 from AKG) to LINE INPUT.

3.2 Microphone Stations

3.2.1 Setting up Microphone

Stations

1. Remove the dip switch cover.

2. Set dip switches nos. 1 through 8 conforming to your system design:

3. Dip switch no. 1 sets the gate threshold. In the "OFF" position, the gate threshold is high and the microphone will not come on unless the user talks into it from a very short distance. As soon as the microphone is open, the threshold will be automatically reduced by 6dB so the microphone will not switch off if the talker speaks more softly or moves away from the microphone. In the "ON" position, the gate threshold is 6dB lower than in the "OF" position. Again, as soon as the microphone is open, the threshold will be automatically reduced.

4. Dip switch no. 2 toggles the time the microphone remains open after the talker stops talking between 12 seconds ("OFF") and 6 seconds ("ON").
5. Dip switch no. 3 activates and deactivates the microphone Automute function. In the "OFF" position, the microphone will be muted automatically after the delay you set with dip switch no. 2. In the "ON" position, the microphone will not switch off unless the delegate presses the PTT switch.
6. Dip switch no. 4 allows you to switch the Microphone Station out of the NOM Limitation bus, so this is an important option for Chair Stations. In the "OFF" position, the user can switch their microphone on at any time, no matter how many microphones are open already. In the "ON" position, the microphone can not be activated unless the number of open microphones is lower than the number set on the Base Unit.
7. Dip switch no. 5 toggles between Direct and Voice Activation modes. In the "OFF" position, the delegate can only switch the microphone on and of by pressing the PTT switch. In the "ON" position, the delegate may use the PTT switch, too. However, if the Base Unit operates in Voice Activation mode, the microphone will come on automatically when talked into.
8. Dip switch no. 6 allows you to switch the Microphone Station out of the priority mute bus. Set dip switch no. 6 to "OFF" on all important Microphone Stations (chairpersons and their deputies, important delegates) to "OFF" to make sure these microphones will remain open even if the chairperson presses the priority button. In the "ON" position, the microphone will be muted whenever the chairperson holds down the priority button.
9. Dip switch no. 7 activates/deactivates the Voice Zoom function. In the "OFF" position, Microphone Station gain will be increased automatically if the talker speaks more softly or moves away from the microphone while the signal will be compressed or even limited if the talker speaks very loud or too close to the microphone. In t he "ON" position, Microphone Station gain will remain constant.
10. Dip switch no. 8: In the "OFF" position, the last volume setting for the built-in loudspeakers and headphone outputs will be saved and remains in memory even after powering down. In the "ON" position, the volume of the loudspeakers and headphone outputs will be automatically set to maximum upon powering up.

The trimmer pot P3 sets the Microphone Station output level. The output level has been factory preset for optimum matching to the CS 2 BU Base Unit. Be sure not to change the setting of P3 because mismatching may cause system malfunction.

1. Replace the dip switch cover.

2. Cut an installation opening into the tabletop, using the template in fig. 13.

3. Insert the Microphone Station into the opening and fix the Microphone Station with four suitable screws (not supplied)

All four types of Microphone Stations provide the same connectors for the CS MK connecting cable:

Pin No.	Color	Function
1	PINK	Power 36V
2	RED	Power 36V
3	GREY	Ground 0V
4	BLUE	Ground 0V
5	EXTERNAL SHIELD	Shield
6	GREEN	NOM limitation
7	YELLOW	Active mic detection
8	GREEN/YELLOW SHIELD	Active mic detection
9	WHITE GREEN	Priority
10	BROWN GREEN	Voice Activation
11	WHITE	Speech signal inphase
12	BROWN	Speech signal return
13	WHITE/BROWN SHIELD	Shield
14	BLACK	Loudspeaker inphase
15	VIOLET	Loudspeaker return

The maximum number of Microphone Stations you can connect to each DELEGATE UNITS LINE connector depends on which power supplies you will connect to the Base Unit:

Refer to fig. 8 and Table 2 on page 15.

Important!

3.2.2 Installing "CS 2 DU fix" and "CS 2 CU fix" Microphone Stations

Refer to fig. 13.

3.2.3 Connecting Microphone Stations

Table 4: Maximum number and recommended distribution of Microphone Stations vs. power supplies used.	(Acceptable) / Optimum Number of Microphone Stations
	Power Supplies	Total	LINE 1	LINE 2	LINE 3	LINE 4
	1 x CS PS 20	40	(40) / 10	(0) / 10	(0) / 10	(0) / 10
	2 x CS PS 20	80	(50) / 20	(30) / 20	(0) / 20	(0) / 20
	1 x CS PS 100	200	50	50	50	50
1. Use a CS MK cable of suitable length to connect the DELEGATE UNITS LINE 1 connector on the Base Unit to one of the two connectors on the first Microphone Station. 2. Connect the other connector on the first Microphone Station to one of the two connectors on the next Microphone Station and so on.
Important!	If you connect the maximum number of Microphone Stations, distribute the Microphone Stations to LINE 1 through 4 as recommended in Table 4 above. Also, make sure the total cable length from the Base Unit to the last Microphone Station does not exceed 330 feet (100 m). This is the only way to ensure that all Microphone Stations will receive an adequate supply voltage (21 VDC minimum).
3.2.4 Connecting Microphones	1. Select the proper gooseneck and microphone capsule for each Microphone Station. For details refer to the Discreet Acoustics Modular Series manual.
Note:	You can also use each type of Microphone Station with no microphone, as a monitoring device, e.g., for a secretary or stenographer.
Refer to fig. 9.	2. Screw the microphone capsule on the gooseneck. 3. Screw the gooseneck into the microphone jack on the Microphone Station.
3.3 Connecting to Power Important!	Check that the AC mains voltage stated on your power supplies is identical to the AC mains voltage available where you will use your system. Using the power supplies with a different AC mains voltage may cause damage to the unit.
Refer to fig. 10.	A If you connected not more than 30 to 40 Microphone Stations to your Base Unit you will need a single CS PS 20 power supply.
Refer to fig. 11.	1. Open the 4-pin Phoenix connector (1) on the DC cable of the power supply and check that the jumper (2) between "0V1" and "0V2" as well as the jumper (2) between "+"1" and "+"2" are in place. These two jumpers (2) must be in place for all Microphone Station lines (LINE 1 through LINE 4) to be powered. 2. Connect the DC cable of the power supply to the 4-pin DC INPUT connector (3) on the Base Unit rear panel. 3. Connect the power supply to a convenient power outlet.
Refer to fig. 11.	B If you connected between 40 and 80 Microphone Stations to the Base Unit you will need two CS PS 20 power supplies. 1. Remove the two jumpers (2) from the Phoenix connector (1) of one of your power supplies. 2. Disconnect the Phoenix connector from the DC cable of the second power supply and connect the DC cable of the second power supply to the screw terminals "0V2" and "+"2" on the Phoenix connector of the first power supply. 3. Connect the Phoenix connector with the DC cables of the two power supplies to the 4-pin DC INPUT connector (3) on the Base Unit rear panel. 4. Connect the power supplies to a convenient power outlet.
C If you connected between 80 and 200 Microphone Stations to the Base Unit you will need one CS PS 100 power supply.
1. Install the power supply in your rack.
Important!	To ensure proper ventilation for cooling the power supply, leave one rack space each above and below the power supply unoccupied.
2. Connect the DC cable of the power supply to the DC INPUT connector on the Base Unit rear panel. 3. Connect the power supply to a convenient power outlet.
Note:	The CS PS 20 power supply has no power switch and will use energy even when the system is switched off. We therefore recommend connecting these power supplies to a power circuit with an on/off switch. You can use this on/off switch as a master switch for the entire system.
Note:	The EXPANSION connectors provide no supply voltage. If you are setting up a system with several Base Units, be sure to connect the required power supply/supplies to each Base Unit.

If you connected several Base Units together, the POWER switch on the master switches the master and all slaves on. The controls and control functions (NOM limitation, priority, etc.) of each master or slave Base Unit will only affect the Microphone Stations connected to the same Base Unit. The summed audio signal of all Base Units is available at the LINE OUTPUT connectors on all Base Units.

1. Systems with one or two CS PS 20s: If you connected the power supply/supplies to a switchable power circuit, switch the circuit on.

Systems with CS PS 100s: Set the on/off switch on each power supply to "I" to switch each power supply on.

1. Set the POWER switch on the master Base Unit to "I" to switch power to all Base Units on. The ON LED will illuminate 2 seconds after powering up. During this interval, the supply voltage is stabilized internally.

If the red ERROR LED illuminates, check the internal fuses and replace any blown fuses (refer to section 4.8). Should the ERROR LED illuminate again upon switching on, contact your nearest AKG Service Center.

1. To switch power to the (all) Base Unit(s) off, set the front panel POWER switch on the (master) Base Unit to "0".

2. Systems with one or two CS PS 20s: If the system will remain off for more than a few hours, we recommend disconnecting the power supplies from power (disconnect the power plugs or set the master switch to OFF). This will save energy and costs.

Systems with CS PS 100s: Set the on/off switch on each power supply to "0" to switch each power supply off.

1. Set the NOM LIMITATION selector on the Base Unit front panel to the maximum number of microphones (1 to 5) that may be open simultaneously at any time.

Whenever the number of open microphones equals the limit you set, the LIMIT LED will illuminate and no more microphones can be activated.

1. To deactivate NOM limitation, set the NOM LIMITATION selector to "∞".

If you connected 30 to 40 Microphone Stations and only one CS PS 20 power supply to the Base Unit, be sure to set NOM LIMITATION no higher than to "4". Setting NOM LIMITATION to "5" may cause malfunction.

If your customer wishes to limit the number of open microphones to 5, you will need to use two CS PS 20 power supplies.

1. To switch the Voice Activation function on, push the VOICE ACTIVATION button on the Base Unit front panel IN.
   The microphones on all Microphone Stations where Voice Activation is ON can be activated by talking into them.
   The red LED ring on the microphone capsule and the status LED next to the PTT switch will illuminate to indicate the microphone is open.
2. If the gate threshold is too high or too low, set dip switch no. 1 on the Microphone Station bottom panel to the other position:
   OFF: high threshold
   ON: low threshold
3. To deactivate Voice Activation, press the VOICE ACTIVATION button again.
   The VOICE ACTIVATION LED will extinguish and the microphones can only be activated by pressing the PTT switch.
4. If the Automute function is active, the microphone will automatically mute 6 or 12 seconds after the user stops talking.
5. If Automute is off, the delegate will have to press the PTT switch again to mute the microphone.

Use the front panel SPEAKERS OUT control on the Base Unit to set the maximum volume level of the loudspeakers on the Microphone Stations. This is the highest level you can set with the volume keys on the Microphone Stations.

If you connected 30 to 40 Microphone Stations and only one CS PS 20 power supply to the Base Unit, be sure to set SPEAKERS OUT no higher than 2 o'clock (70%). Setting SPEAKERS OUT any higher may cause malfunction.

If your customer requires higher volume levels, you will need to use two CS PS 20 power supplies.

On each Microphone Station, set the compression ratio for the Voice Zoom function:

Trimmer pot B on the Microphone Station bottom panel sets the Voice Zoom compression ratio. At full CCW, the compression ratio is approx. 1:1 so the microphone signal will hardly be compressed. At full CW, the compression ratio is 2:1. Gain will be automatically increased on quiet signals and reduced on loud signals.

1. As long as the red LED ring on the microphone and the status LED next to the PTT switch are illuminated, the microphone is open.
2. The + / - volume keys allow the user to set their own volume to the maximum set on the Base Unit.

Note:

4.1 Powering Up

4.2 Powering Down

4.3 Setting NOM Limitation

Note:

4.4 Activating and Deactivating Microphones (Voice Activation and Automute)

Refer to fig. 8.

Also refer to section 3.2.1 Setting up Microphone Stations.

Refer also to section 3.2.1, dip switches nos. 2 and 3.

4.5 Setting Loudspeaker Levels

Note:

4.6 Setting Voice Zoom Refer to fig. 4.

4.7 Notes on Using Microphone Stations

1. To calm down a heated discussion, the chairperson can press and hold down the priority button to mute all other microphones (except for those switched out of the priority bus). The microphones can not be activated before the chairperson releases the priority button. In a system with several Base Units, the priority key will mute only those microphones that are connected to the same Base Unit as the Microphone Station on which the priority button was pressed.

4.8 Replacing Internal Fuses

Each Microphone Station bus (LINE 1 to LINE 4) has its own T4A slow-blow fuse and the motherboard uses a T1A slow-blow fuse.

• If the rear panel ERROR LED on the Base Unit and the red ERROR LED in the front panel OUTPUT CONTROL section illuminate, the motherboard fuse has blown.
• If the front panel ERROR LED, the rear panel ERROR LED, and one of the ERROR LEDs next to a LINE connector illuminate, the fuse on the respective Microphone Station bus has blown.

Replace the defective fuse:

1. Switch power to the Base Unit and the related power supplies OFF.
2. Remove the fixing screws of the Base Unit top panel.
3. Remove the top panel.

Refer to fig. 5.

1. Remove the defective fuse (1 2 3 4 5) from its holder.
2. Insert a new fuse of the same type (1 2 3 4: T4A slow-blow for LINE 1 through 4; 5: T1A slow-blow for the motherboard).
3. Screw the top panel back on the Base Unit.

5 Cleaning

1. Switch power to the Base Unit off and disconnect the power supply/supplies from power.
2. Use a cloth slightly moistened (not wet!) with water to clean the surfaces of the Base Unit, power supplies, and Microphone Stations.

Important!

Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since these may damage the enamel or plastic parts.

6 Troubleshooting

Problem	Possible Cause	Remedy
No sound.	1. Power supply/supplies not connected to power. 2. Power supply/supplies not connected to Base Unit(s). 3. Power supply/supplies and/or Base Unit(s) are OFF. 4. MIC DELEGATES LEVEL control fully CCW. 5. One or more internal fuses on the Base Unit have blown.	1. Connect power supply/supplies to a suitable power outlet. 2. Connect power supply/supplies to Base Unit(s) 3. Switch power to Base Unit(s) and/or power supply/supplies on. 4. Turn MIC DELEGATES LEVEL control up. 5. Replace fuse(s).
In Voice Activation mode, a single microphone is talked into but all microphones come on.	1. Gate threshold too low. 2. Volume level of Microphone Station loud-speakers is too high and mechanical noise triggers gate.	1. Set dip switch no. 1 on Microphone Stations to "OFF" ("1"). 2a. Turn down SPEAKERS OUT control on Base Unit. 2b. Use external sound system instead of built-in loudspeakers. 2c. Use headphones instead of built-in loud-speakers. 2d. Deactivate Voice Activation.
The system works but some Microphone Stations do not.	1. Zero voltage at DC INPUT +1 or +2. 2. If you use two CS PS 20s, one may be defective. 3. One of the internal fuses has blown (appropriate ERROR LEDs illuminated).	1. Refer to section 3.3. 2. Replace defective power supply. 3. Replace fuse (refer to section 4.8).

7.1 CS 2BU Base Unit

Inputs

LINE 1-4

Connectors 4x male 15-pin D-Sub HD

Nominal input level +10 dBu

Type electronically balanced

Max. input level for <1% THD +23 dBu

LINE INPUT

Connector 3-pin female XLR

Nominal input level ±0 dBu

Type transformer balanced

Input impedance at 1 kHz 30 kΩ

Max. input level for <1% THD +17 dBu

AUX IN

Connectors 2x female RCA

Nominal input level -10 dBu

Type unbalanced

Input impedance at 1 kHz 33 kΩ

Max. input level for <1% THD +5 dBu

Outputs

REC OUT

Connectors 2 x female RCA

Nominal output level ±0 dBu

Max. output level at 1% THD 17 dBu

Audio bandwidth 15 Hz to 50 kHz

Min. load impedance 33 Ω

THD & N at 1 kHz 0.01%

S/N ratio 62 dB

LINE OUTPUT

Connector 3-pin male XLR

Nominal output level ±0 dBu

Max. output level at 1% THD +10 dBu

Audio bandwidth 20 Hz to 40 kHz

Min. load impedance 300 Ω

THD & N at 1 kHz 0.02%

S/N ratio 88 dB

Headphones

Connector 1/4" TRS jack

Nominal output level ± 0 dBu

Max. output level at 1% THD +14 dBu

Min. load impedance 150Ω

THD & N at 1 kHz 0.05%

S/N ratio 70 dB

EFFECT

Connector 1/4" TRS jack

Nominal level ±0 dBu

Input impedance <4.7 kΩ

Max. output level at 1% THD +14 dBu

Min. load impedance 220Ω

System

Operating voltage 23 to 36 VDC

Current consumption at max. voltage 170 to 200mA

Max. power requirement 7.2 watts

Size (LxWxH) 170 x 430 x 40 mm (6.7 x 19 x 1.6 in.)

Shipping/net weight 3.2kg (7.1 lbs.)/2.5 kg (6.2 lbs.)

Package contents Base Unit without power supply

Order Numbers

CS2BU 6000H3400

Optional Accessories

CS PS 20 6000H3600

CS PS 100 6000H3601

CS MK AC-EU 6000H3602

CS MK AC-US 6000H3603

CS MC AC-UK 6000H3604

7.2 CS 2 DU / CS 2 CU Microphone Stations

Compatible microphones GN 30 CS or GN 50 CS with CK 31, CK 32, CK 33, CK 47 or CK 80 only

Input

Type balanced, with DC supply voltage

Impedance 1.5 kΩ

Supply voltage for microphone capsule 5.5 VDC

Outputs

Line

Connectors

2x male 15-pin D-Sub HD

Type transformer balanced, floating

Nominal level +10dBu

Audio bandwidth 55 Hz to 35 kHz

S/N ratio 81 dB

System compatibility compatible to CS 1

THD & N at 1 kHz 0.25%

Equivalent input noise, noise gate on

22 Hz to 22 kHz -105 dBu

Headphones and Loudspeakers

Connectors 2xTSmini jack

Output power for <1% THD 0.48 watts (loudspeakers)

Audio bandwidth 30 Hz to 45 kHz

S/N ratio 85 dB

THD & N at 1 kHz 0.25%

Equivalent input noise, noise gate on

22 Hz to 22 kHz -105 dBu

Digital pot attenuation 32 increments from 0 to -82 dB

System

Adjustable functions Voice Activation sensitivity

Voice Activation hold time

Mic Automute

NOM Limitation

Voice Activation on/off

Priority on/off

Compression on/off

Digipot reset on power-up/last setting

memory

Compression ratio

Color AKG Blue Line gray / matte black

Package contents Microphone Station without cable and

microphone

Order Numbers

CS2CU 2770Z0001

CS2DU 2770Z0002

CS2CUfix 2770Z0003

CS2DUfix 2770Z0004

Optional Accessories

CS MK 1.25 fm 1.25-m (4-ft.) connecting cable 2770Z0011

CS MK 2.5 fm 2.5-m (8-ft.) connecting cable 2770Z0012

CS MK 5 fm 5-m (16-ft.) connecting cable 2770Z0013

CS MK 10 fm 10-m (33 ft.) connecting cable 2770Z0014

CS MK 20 fm 20-m (66-ft.) connecting cable 2770Z0015

CK 31 Discreet Acoustics microphone capsule 2765Z0020

CK 32 Discreet Acoustics microphone capsule 2765Z0021

CK 33 Discreet Acoustics microphone capsule 2765Z0022

CK 47 Discreet Acoustics microphone capsule 2765Z0023

CK 80 Discreet Acoustics microphone capsule 2765Z0024

GN 30 CS gooseneck (approx. 30 cm/12 in.) 2765Z0027

GN 30 CS gooseneck (approx. 50 cm/20 in.) 2765Z0028

CS MK 1/2 100-m (330-ft.) cable 9.5 mm (0.37 in.) in diameter

for permanent installation 6000H3612

CS MK 100 oc/mob 100-m (330-ft.) cable 7 mm (0.27 in.) in diameter

for mobile installation 6000H3611

CS CON fm/fi female D-Sub connector

for permanent installation 6000H3620

CS CON m/fi as CS CON fm/fi, male 6000H3621

CS CON fm/mob female D-Sub for mobile use 6000H3622

CS CON m/mob male D-Sub for mobile use 6000H3623

CS CON floor/m/finale male floor-mount D-Sub 6000H3624

CS CON split2/m/mob male 2-way D-Sub 6000H3625

CS CON split4/m/mob male 4-way D-Sub

K 10 conference headphones 2246Z0013

K 11 single earphone 2724Z0011

Page

3.1.1 Configurar a central (as centroids)

H A Harman International Company

AKG Acoustics GmbH

BodenseestraBe 228, D-81243 Munchen/GERMANY, Tel: [phone], Fax: [phone], www.akg-acoustics.de, e-mail: [e-mail]

AKG ACOUTICS, U.S.

914 Airpark Center Drive, Nashville, TN 37217, U.S.A., Tel: [phone], Fax: [phone], www.akgusa.com, e-mail: [e-mail]

For other products and distributors worldwide see our website: www.akg.com