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5.1.2 Audio
6 Audio Inputs:
3 microphone inputs (balanced, 24V phantom powered) via XLR connectors.
3 audio inputs (line level) via RCA connectors.
All audio inputs are active by default. For further information, refer to chapter Audio
.
Audio input connector specification:
Connector label Microphone(s) Audio input(s)
Signal type Balanced Unbalanced
Connector (codec) XLR-F, pin 1-gnd,
pin 2 hot, pin 3-
cold/neutral
Female RCA/phono,
sleeve-ground,
centre-signal
Input impedance 2400 ohms (pin 2 -
3)
10K ohms
Max input level when
set to minimum input
level
83 mVpp 15.5 Vpp
Max input level when
set to maximum
input level
6.2 mVpp 1.2 Vpp
Range, menu
adjustable input gain
22.5 dB (16 steps of
1.5 dB)
22.5 dB (16 steps of
1.5 dB)
Phantom power
voltage
24 V +/- 5% -
Phantom power
resistor, pin 2
1200 ohms -
Phantom power
resistor, pin 3
1200 ohms -
Max phantom power
current pr mic
12 mA
-
3 Audio Outputs:
1 output (line level) via RCA connector providing audio from far end, in addition to dial
tones. This output also supports S/PDIF. S/PDIF (Sony/Philips Digital Interface) is used
by the Digital Natural Audio module.
1 AUX output (line level) via RCA connector providing a mixed signal between audio from
the local side (except from the AUX input) and audio from the far end. This output is
intended for connection to a telephone add-on system. When system is configured as
stereo, this output will provide the left stereo information.
1 VCR output (line level) via RCA connector providing a mixed signal between audio from
the local side (except from the VCR input) and audio from the far end. This output is
intended for connection to a VCR. When system is configured as stereo, this output will
provide the right stereo information.