• Single mic input with selectable 48v phantom power
• Band pass filter optimised for voice
• Transformer balanced inputs and outputs
• Output level feature limiter on/off, or extra headroom mode
• Two talkback circuits
• Talkback circuit features Config+
• LED PPM meter with 7 segments
• Commentator's headphone output on 6.35mm jack socket (A or B gauge)
• Headphone inputs have level control and left/right/both switching
• Commentator side tone level control
• Size: 190 x 92 x 222 mm (w x h x d)

The GS-CU008B is a popular general purpose mic and headphone interface. It's flexibility has resulted in various custom designs with multiple mic inputs, or multiple monitoring inputs. These options can interface with wireless systems, or be used for audio description.

Inputs
The front panel input is transformer balanced at microphone level with a selectable 48v phantom power switch. A small pot is on the front panel for adjusting gain control, and the mic on/off switch can also be set to act as a cough switch. For optimising the voice input, a band pass filter is used.

Outputs/Talkback
There is a single transformer balanced programme output. The output level is configurable by a three position selector switch which would typically be used with the compressor / limiter active above 0dB. The limiter can also be turned off for a 0dB output. If the compressor / limiter is not required, but more headroom is, the user can select a -10dB output without compressor/limiter. There are two talkback circuits with top panel push buttons and rear panel XLR outputs. Talkback buttons feature Config+ and can be configured as either lazy or momentary. 

Monitoring
There are three audio inputs with a variable pot for headphone monitoring for a single commentator, with a control for adjusting sidetone level in the headphones. All pots have left/both/right headphone switching so to adjust any input to either side of the headphones. The operator has a single 6.35mm headphone socket. There is a 7 segment LED PPM meter.

Power
Internal switch mode power supply 90-240v AC. An external power input is also provided on a 4 pin XLR 10-18v DC.

MIC INPUT GAIN
-66dBu to -42dBu 

MIC + PHANTOM PWR GAIN
-56dBu to -31dBu 

EQUIVALENT INPUT NOISE
121dBu (22-22kHz RMS gain @ max) Input terminated with 300 Ohms 

PHANTOM POWER
48Volts @ 10mA 

MAX INPUT LEVEL (COMPRESSOR OFF) 
-41dBu (gain @ 60dB) 

MAX INPUT LEVEL (COMPRESSOR ON) 
-21dBu (gain @ 60dB) 

INPUT LEVEL COMPRESSOR OUTPUT LEVEL 
-62dBu -10dBu 
-52dBu 0dBu 
-42dBu +5dBu 
-32dBu +8.5dBu 
-22dBu +11dBu 
-14dBu +12.5dBu (Just clipping) 

THD+NOISE
<0.2% (50Hz to 20kHz) 

PPM METER
8 LEDs dB Step between LEDs 

PGM & TB OUTPUT IMPEDANCE
50 OHMS Transformer Balanced 

CUE & TB INPUT IMPEDANCE
=> 15kOhms Transformer Balanced 

HEADPHONE ROUTING
All headphone inputs switchable to either or both ears 

HEADPHONE LEVELS MAX
+ 18dBu into 600 Ohms ****Warning high headphone levels can be 
harmful to your hearing**** 

HEADPHONE IMPEDANCE
200 to 2000 OHMS 

HEADPHONE CONNECTOR
A or B gauge jack socket 

POWER MAINS
100 – 240 Volts 50/60 Hz < 100mA @ 100 Volts IEC Connector 

POWER DC
10 – 18 Volts < 200mA @ 10 Volts 4 Pin XLR 

POWER ON INDICATOR
Blue LED 

OVERALL SIZE
GS-CU008B
190 x 222 x 92mm (W x D x H)

UNIT WEIGHT
GS-CU008B = 1.65Kg 

GS-CU008 Single comms box with no talkback four wires
GS-CU008/A Single comms box with 1 x talkback four wires
GS-CU008/B Single comms box with 2 x talkback four wires
GS-CU008/C Single comms box with 3 talkback four wires
GS-CU008/CIRC (For more than 3 talkbacks) Per addition talkback four wire circuit

MIC ON LOOP A mic on loop output can be specified on any of the versions

GS-CU008/CIRC/V Adds a second PGM output to any version

• GS-CU008B Block Diagram

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International: +44 1622 753662
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