Cloud Electronics MPA626 - Manual (Page 9)

8 MPA-626: Installation and Operation Manual
The restoration relays may also be used to route the output to specific zones for paging
purposes as shown below.
Using a Restoration Relay to Route the Output
8 Front Panel Level Controls
A separate microphone level control is provided for each microphone input and these provide
the user with a convenient means to operate the microphones at a suitable level. The
microphone signals are routed directly to the aux output and power amplifier and are unaffected
by the operation of the music level control. The gain controls on the rear panel should be set at
a level where it is not possible to have excessive gain even when the front panel level controls
are fully clockwise. Self-adhesive labels are provided to customise the controls.
9 Microphone Equalisation
The microphone channel has both a fixed high pass filter and independent pre-set equalisation
controls positioned on the rear panel. The filter attenuates the signal below 100Hz and the tone
controls provide ±10dB at 100Hz and 5kHz.
10 Microphone Priority
The MPA-626 provides three separate microphone priority functions. Two of these enable the
microphones to have priority over music the other allows Mic 1 to have priority over Mic 2.
10.1 Microphone over music priority
Fully automatic, voice operated priority is provided for the microphone signals. This function can
be selected by means of jumper J5. With this priority function on, when a microphone signal is
detected, the music signal is attenuated, allowing the message to be clearly heard; normal
music operation is restored smoothly after the announcement has been made.
In circumstances where a microphone is switched on by means of the access input the access
input can also be used to trigger a reduction in music level. For Mic 1 this function selected by
J4, for Mic 2 use J3. The amount of attenuation can be set to 30dB or 60dB by means of J6.
For installations using restoration relays it is recommended that this access input priority is
used, with the attenuation set to 60dB. This will prevent any music signals going up and down in
areas where the volume controls have been set low.
10.2 Mic 1 over Mic 2 priority
In situations where the access inputs are used to open both mic 1 and mic 2 the descending
priority feature can be used to give mic 1 priority over mic 2. This is selected by means of a rear
panel switch. When switched on this feature prevents any signal from Mic 2 being broadcast
when Mic 1 is 'accessed'. It should be noted that this feature will allow the user of Mic 1 to cut
off announcements being made using Mic 2.
11 Chime
The MPA-626 has an internal pre-announcement chime generator. The chime can be triggered
by either (or both) Mic access input; this is selected by means of jumper J8 for Mic 1 and J7 for
Mic 2. A rear panel rotary control is provided to set the chime volume. The chime signal is
present on the AUX outputs, low impedance and line outputs.
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