APART MA120, Instruction Manual, Page: 8 / 24

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Mixing amplifiers
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1.
Emergency input: connect your balanced 0 dBV line level emergency
input to the euroblock connector. If available, connect the emergency
contact to the “mute all” connection. The contact must be “potential
free”, i.e. a relay or switch contact that does not carry any voltage.
Alternatively, activate the “vox” circuitry by turning the vox control
until you hear an audible “click”. Now turn the vox control up
while playing music until the vox circuit is activated. The vox and
the mute all switch have the same function: they will mute all other
sources, and will wake up the unit from standby (auto standby and
front button standby). The emergency level can be set with the
volume control. If the clip led lights up when the emergency signal
is present, lower the level of the emergency signal at the source to
avoid distortion. Activating the emergency input will also activate the
priority output (11).
2.
Paging mic input: connect your paging mic here: the input accepts
microphone level signals on balanced euroblock, line level signals
on balanced euroblock or RCA. Set the mic/line switch accordingly.
Adjust the gain control so that the clip led does not light up when
the signal is at its highest level. Then set the volume control as
desired. When the paging contact is closed, all other sources (except
emergency input) will be muted, and the chime will sound. Set the
chime level as desired. The paging contact will also activate the
priority output (11). To test the chime level, a chime test button is
present.
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Connections