AKG Acoustics CS1 User Manual

Description

The AKG Model CS 1 is an extremely flexible and
sophisticated gating-type conference system for
accommodating large numbers of participants. Its various
modes of operation provide for flexibility and discussion
continuity during the most complex formal and political
meetings.

A single CS BU 1 base unit will handle 100 user
microphone units in four series-wired groups of 25 units
each. One or more Model CS EU 1 extension units may be
used, each providing an additional capability of 100 user
microphone units. The base unit offers the following control
functions:

1. Input level controls: active microphones, line, and
auxiliary. The line input can accommodate additional signal
inputs, such as wireless microphones; the auxiliary input
accommodates an external stereo audio source.

2. NOM (number of microphones) setting; determines the
maximum number of microphones that may be open at one
time; useful in maintaining orderly discussions. Up to five
simultaneous microphones inputs may be on at a given time.

3. Loudspeaker level control. Sets level of output signal
which is fed back to the nearfield loudspeakers located in
each individual user station.

4. Line output control. Sets level sent to local sound
reinforcement facilities.

5. Recording output. Determines the level of the stereo
output signal intended for recording program proceedings.

The CS DU “delegate” user station provides management

via self-contained DIP-switches over the following functions:

1. Microphone sensitivity adjustment (high or low)

2. Automatic muting after long pauses (on or off)

3. Muting time setting (long or short)

4. NOM, on or off (allows distinguished participants to
speak, even when NOM limit has been reached)

5. Voice/pushbutton activation (allows distinguished
participants to speak without using pushbutton); when a user
station is activated, its internal loudspeaker is muted in order
to avoid feedback.

The CS CU “chairman” user station is designated for
chairman and sub-chairmen use and has an additional
priority control that will mute all lower priority stations when
engaged. Through the use of dual-level priority action, both
chairman and sub-chairmen levels of control may be
accommodated. This is considered a valuable feature in
political discussions, where there may be multiple levels of
authority on the discussion floor.

On all user stations a bright red LED ring just below the
microphone capsule lights up when that microphone is
actuated.

Figure 1 shows a typical setup using a single base unit,
and Figure 2 shows as typical setup using a single base unit
plus an expansion unit.

Features

• Multiple levels of priority gating

• Simplified series-wiring for easy
setup and minimum clutter

• Near-field loudspeaker included in
all user modules

• Base control unit provides for 100
microphone inputs; expansion units
each provide 100 additional inputs

• Uses AKG’s small format high
performance CK-series microphone
capsules mounted on short double
gooseneck extensions

• Base control unit inputs: additional
(wireless) microphones and stereo
program source

• Base control unit outputs: stereo
recording and public address feeds

Conference System

CS 1

8

1

2

3

4

5

MICROPHONES LINE AUX.

POWER

ON

VOICE

ACTIVATED

AUDIO CONTROL POWER

LIMIT

O

AC POWER INPUT

50/60Hz 250VA

OV OV OV

Made in Germany

DELEGATE MICROPHONES LINE OUT

bal.

LINE

IN

bal.

AUX

IN

LL

RR

OUT / REC

LINE 1 LINE 2 LINE 3 LINE4

INT.

SPEAKER

FINE

ADJUST

Specifications:

CS BU 1 Base Unit:

Frequency response: 20–20,000 Hz

Signal-to-noise ratio: > 70 dB

Audio Inputs
Discussion (Summed): +16 dB
Line: -10 to +6 dB
Tape: -20 to +6 dB

Audio Outputs
User station loudspeakers: 0 db
Record output: -20 to +6 dB

Connectors
User station/extension socket: 4 x 12-pin male

Audio Inputs: XLR 3-pin female

Audio Outputs: XLR 3-pin male

Tape output: RCA jacks

General
Power Requirement: 115–230 V/50–60 Hz
Power Consumption: 250 VA
Width: 17.7 in. (450 mm)
Depth: 9.8 in. (250 mm)
Height: 1.7 in. (44 mm)
Weight: approx. 11 lbs. (5 kg)

CS1 Components:

CS BU 1 Base unit for up to 100 microphone stations
CS EU 1 Extension unit for additional 100 microphones
CS CU 31 Chairman user station with CK 31
CS DU 31 Delegate user station with CK 31
CS CU Chairman user station without microphone
CS DU Delegate user station without microphone

Optional Accessories:

CS RMU 1 Rack ears for CS BU 1
CK 31 Cardioid microphone capsule
CK 32 Omnidirectional microphone capsule
CK 33 Hypercardioid microphone capsule
CK 47 Studio quality hypercardioid microphone capsule
CK 80 Hypercardioid microphone capsule with speech

optimized frequency response
W 30 Windscreen for CK 31, CK 32, and CK 33
W 70 Windscreen for CK 47
W 80 Windscreen for CK 80

CS CU/CS DU User Stations:

Pre-Amplifier
Frequency Response: 20–15,000 Hz
THD: < 0.1%
Signal-to-noise ratio: > 106 dB

Microphone (CK 31)
Sensitivity: 20 mV/Pa 34 dBV
Polar Pattern: cardioid
Frequency Response: 100–18,000 Hz

Signal-to-noise ratio: > 97 dB

Current Consumption
Standby: 30 mA
Operating: 70 mA

Power Requirement: 22 to 36 V DC

Figure 1 Figure 2

1

2

3

25

26

-

50

51

-

75

76

-

100

CS BU 1

1

2

3

25

26

-

50

51

-

75

CS BU 1

CS EU 1

100 Additional user stations

(for a total of 175)