Jumper Selections
AUX Input Signal-Processing Jumper
• The AUX input available on the module can be set
to feed its signal to the amplifier’s front level con-
trol by setting the jumper in the “Normal” position.
The signal applied to this input will eventually be
processed to the gain riding function of the ANS1R
like every other input installed in the amplifier.
• By setting the jumper to “Bypass” position, the AUX
input will not be affected by any gain level changes
of the ANS1R.The amplifier’s front panel level con-
trol will be inactive when the module is set in this
mode. Any AUX signal level adjustment must be
made using the module’s AUX LVL control.
There are situations where it may be undesirable for
this AUX input to be affected by the gain riding function of the ANS1R.A typical exam-
ple would be where low level background music is desired in a lounge when there are
only a few people present.When the lounge is crowded and the ambient noise level is
high,it is not desirable for the background music level to increase since it will only add
to the high ambient noise.This is a case where the AUX input “Bypass” setting would
be appropriate.
Muting Jumper
Jumper placement only affects the module’s unbalanced input signal.The jumper placement
determines whether the module’s input can be muted by other input modules or not.
When enabled,the input is permanently set to the lowest priority level. When disabled,
the module will not respond to mute signal and remains active continuously.
Module Installation1. Turn off all power to the unit.
2. Make all necessary jumper selections.
3. Position module in front of desired
output module bay opening,making sure that the module is right-side up. Output
modules will not fit in an input module bay.Do not force an output module into an
input module bay.
4. Slide module on to card guide rails.Make sure that both the top and bottom guides
are engaged.
5. Push the module in to the bay until the faceplate contacts the unit’s chassis.
6. Use the two screws included to secure the module to the unit.
WARNING:
Turn off power to unit and make all jumper
selections before installing module in unit.
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4. Set the ACT THREScontrol to a point just before the ACT LED flashes amber.If audio
activity is intermittent,see Operating In Systems With Intermittent Audio Activity.
5a. Using the char t and diagram on page 7,set the AMBNT THRES to the dBspl level
where automatic increases to the system volume would be desired;or
5b. If the live ambient noise level while making these adjustments is at the desired trip
point,then adjust the AMBNT THRES control to a point where the ACT LED flashes
green.
6. Adjust the MAX GAIN to limit the maximum amount of gain the ANS1R can add to
the system.
7. Adjust the RAMP SPEED control to the desired amount of signal gain per second
(dB/s).Lower gain per second (dB/s) settings allows for gradual increases and decreas-
es and ignores short bursts of noise.Higher gain per second (dB/s) settings allow the
system to react quickly to shorter bursts of noise.
8. Test the system’s response to noise and,if necessary, set the ACT THRES control high-
er if the maximum signal level is not achieved.Tweaking adjustments to Max Gain and
Ramp Speed controls may also be necessary.
Operation In Systems With Intermittent Audio Activity
The ANS1R monitors the audio activity on the mix bus of the main unit.Using this infor-
mation and the ambient noise level information,it regulates the amount of gain added to
the system.This manner of operation allows the proper amount of gain to be added to
keep the sources at the desired intelligible level without allowing it to become too great.
When working in systems that do not have continuous mix bus signals,like simple paging
systems, the ANS1R will behave differently than mentioned above.In these types of sys-
tems,when the ambient noise threshold has been exceeded, the ANS1R will ramp up to
the max gain setting during the time when there is no signal on the mix bus.When audio
activity appears on the bus, the ANS1R may begin to reduce system gain, at the RAMP
SPEED rate,in an attempt to reach an optimum sound level.
With this type of intermittent audio operation,the setting of the MAX GAIN and RAMP
SPEED controls will be the major factors in the operation of the system.The MAX GAIN
should be set for a level that will allow the paging to sound intelligible over the worst case
noise but not higher.The RAMP SPEED should be set to match the type of response to
noise changes wanted.If it is for an area with loud machinery that turns on and off, then a
fast ramp,10-20dB/s, would be applicable.If it is an area where the noise gradually rises and
lowers,then a slow ramp speed, 1-5 dB/s,would be used.The slower ramp speed keeps the
system from boosting gain when short loud noises are encountered.
Module Setup - Continued
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