10
Rear panel overview
Rear panel description
AC Power inlet with fuse:
The mains power supply (100-240V AC - 50/60 Hz) has to be applied to this AC power inlet.
The connection is made by an IEC C14 power connector.
Priority mute contact:
A priority mute contact mutes the music at presence of a contact closure between both
terminals. When priority on the microphone input (Mic in) is enabled, the applied signal will
override the muting which allows emergency announcements or voice messages. This contact
is convenient for situations where a separate emergency system is installed and complete
background music muting is required at occasion of a (fire) alarm. The emergency system
contact outputs can be connected to this contact input.
Loudspeaker output connections:
Output connections for both low impedance (4
Ω
) and constant voltage distributed audio
systems are provided. These outputs are connected using a 4-pin terminal block connection,
with various connection terminals for different output voltage / impedance. More information
about loudspeaker output connections is described in a further chapter of this instruction
manual.
Unbalanced stereo line input:
An unbalanced line level input source (e.g. media-players, radio tuners, ...) can be connected
to the line input which is implemented through RCA connectors. It is fitted with a gain control
potentiometer whereby the input sensitivity can be controlled within a range of +4 dB ~
-20 dB.
NOTE
The gain control potentiometers for the RCA unbalanced stereo line input (rear) also affects
the level for the 3.5 mm jack input connection (front). When switching between front and
rear input, it is recommended to configure both connected audio sources with equal output
levels to allow easy switching (without adjusting the rear input gain).
Balanced microphone input:
Balanced mono sources can be connected to the microphone input which is implemented
using a terminal block connector. It is fitted with a gain control potentiometer whereby the
sensitivity can be adjusted within a range of 0 dB ~ -50 dB which allows connection for
both microphone or line level audio sources (e.g. voice file announcement systems).
A phantom power switch enables 15 Volts phantom power supply for powering condenser
microphones and a priority switch eleminates other connected audio sources once a signal
is present on this input. When priority enabled, this inputs also overrides the priority mute.
