Technical Data
474-Add-on Modules
60
10.1.10 Balanced Audio
Extender modules with a balanced audio interface support a unidirectional 2-channel mono or 1-channel stereo
transmission in studio quality.
The audio interface is at the same time a 'Line-Level' and 'Mic-Level' interface and is designed to transmit signals of
a microphone or mixing desk for
example with a high tolerance for interferences, even at larger distances. In addition
to that you can connect active speakers at the CON Unit.
Each audio input port contains a 6-pole Phoenix terminal block (until 12/2021 as 6.35 mm jack socket) and can be
used symmetrically or asymmetrically.
NOTICE
Microphone connection and/or speaker connection
To connect a microphone to the console, the CPU module with audio input must be installed in the CON Unit. If a
loudspeaker is to be connected to the console, additionally a CON module with audio output is required.
Phantom Power of a Microphone
Phantom power is used for condenser microphones to operate the internal electronic components. The provided
voltage is 48 V DC. Phantom power can only be activated on the audio input side (CPU module).
The microphone has to be connected to the audio input of the CPU module.
To activate phantom power, the switch on the CPU module has to be pressed and clicked into the pressed position.
NOTICE
Damage to audio output devices from phantom power
If audio output devices (e.g., loudspeakers) are operated with phantom power, unexpected damage can occur to
the devices.
Use phantom power only for microphones.
Pre-amplification of a Microphone
The balanced audio interface offers the possibility of a pre-amplification of a microphone at the audio input of the
CPU module.
•
The pre-amplification can be activated for each audio channel separately.
•
To activate the pre-amplification, the dip switch (1 for the left and 2 for the right channel) of the respective audio
channel has to be set to the ON position at the CPU module.
•
The default pre-amplification is 10 dB.
•
The pre-amplification can be configured in the
Config.txt
file of the extender module with the balanced audio
CPU module. Therefore, the respective parameter
GAIN
has to be entered into a new line. The setting can be
configured in single steps between 10 and 65 dB, for example:
−
36 dB (enter
GAIN=36
in
Config.txt
file)
−
48 dB (enter
GAIN=48
in
Config.txt
file)
