The factory setting is voltage mode. Volts applied to trigger the voltage required is (18-24Vdc). The current required
is minimal, less than 10mA. The polarity is not critical. This voltage may be provided by the fire alarm panel or other
suitable source.
Reset
There are two modes of reset - Automatic and Manual. The reset mode is selected by a jumper located behind the
removable front panel. If Auto reset is selected the unit will automatically reset when the trigger signal is removed. If
manual reset is selected, pressing the reset button after the trigger signal has been removed resets the unit.
Test
A test button for initial set up and testing is located adjacent to the reset button. Both reset and test buttons can be
operated through small holes in the front panel using a small screwdriver, match, etc.
Sound level control
The sound level control function has been provided to control the maximum permitted sound level in an
entertainment venue (Often necessary when having to conform to noise pollution requirements).
Each stereo channel has a separate sound level control facility allowing different levels to be set and therefore two
separate areas to be independently controlled.
The sound level control uses 2 circuits, a slow acting sound level threshold (LIMIT) and a fast acting peak limiter
(PEAK).
The unit monitors the level and if the level exceeds the limiter threshold the LIMIT indicator illuminates and the level
will be reduced back to the threshold level. This limiter is controlled by the average programme content and is fairly
slow acting so as not to reduce the dynamics of the music. (An internal jumper is provided to allow a faster operation
if required).
The PEAK limiter threshold is the level above the limiter threshold that short peaks may be permitted to reach, a
single drum beat or a short high vocal note will pass through the slower acting limiter threshold and be controlled by
the setting of the peak threshold. When the level exceeds the peak threshold level the PEAK indicator illuminates.
By setting the average and peak presets maximum levels can be maintained without undue programme
compression taking place so the music will still sound punchy and bright. But the system will be protected from
undue peaks that could cause damage.
Either of the limit or peak functions can be disabled by turning the threshold preset fully clockwise.
If the security loop (DIM) is broken the limit threshold will be reduced by an amount set on the DIM presets (located
behind the front panel) and the DIM indicator will illuminate. The security loop could be used on doors or windows
for example, so if opened (more music escapes) the limit threshold is reduced by a preset amount.
Set up
Remove the 5 front panel screws and drop off the front panel to access the preset controls.
Priority
Factory setting is for microphone input.
If phantom power is required follow the instructions for
Phantom power
in the section headed
Internal options
.
If line input is required follow the instructions for
Priority input selector
in the section headed
Internal options
.
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