OnAir 2000M2 Digital Mixing Console
Date printed: 12.11.03 SW V4.0 Alignment 4-5
4.4 Talkback Mic Input Unit (optional) 1.942.219
On the TB Mic Input Module, only few adjustments are made. First, check
the jumper settings according to chapter 16 of the OnAir 2000M2 Operat-
ing Manual, depending on which kind of microphone is used.
Jumpers: MIC INT/EXT: Input selection – either internal unbalanced microphone (i.e. the standard
electret TB mic 1.942.218 with fixed supply voltage), connected to P6, or
external balanced microphone with switchable phantom power, connected
to P2 or P7.
PHANTOM PWR ON/OFF: Selection of 48 V phantom power for the balanced mic input (P2 or P7).
GAIN HI/LO: For the internal standard electret TB mic, the LO position (nominal input
level: –60 dBu) is used. In HI position, the mic input gain is increased by
20 dB, i.e., the nominal input level is –80 dBu.
EXT. TB CTRL ON/OFF: Activates or deactivates the external TB control input on P4 or P8.
IN1...8: Address selection – please refer to the “Jumper for Module Position”
paragraph in chapter 16.2 of the OnAir 2000M2 Operating Manual; fac-
tory setting: IN2.
Settings: MIC GAIN: Depending on the output level of the microphone used, the limiter thresh-
old is adjusted with the MIC GAIN trimmer potentiometer (RA1). For the
internal standard electret TB mic (nominal output level –60 dBu), the MIC
INT/EXT jumper is set to the INT position, the GAIN jumper is set to the
LO position. Connect an AF voltmeter to the unbalanced TB OUT con-
nector (P5 on the PCB). Then a sine-wave signal (approx. 1 kHz) with a
fixed level of –60 dBu is fed to the INT ELECTRET MIC connector (P6
IN8
IN7
IN6
IN5
IN4
IN3
IN2
IN1
AGND
IN B
IN A
P7
EXT MIC
ON
OFF
PHANTOM PWR
AGND
OUT B
OUT A
P9
TB OUT BAL
AGND
AGND
IN
P6
INT ELEC-
TRET MIC
LO
HI
GAIN
OFF ON
EXT TB CTRL
EXT INT
MIC
AGND
AGND
OUT
P5
TB OUT
UNBAL
GND
INSIG_N
INSIG_P
P8
EXT TB
CTRL
EXT_VCC
RA1
MIC GAIN
RA2
OUTPUT
LEVEL
P4
P1
P3P2
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