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BASS and TREBLE
Bass and treble controls are provided to adjust the high frequency and low frequency
response of the paging system. Reference positions are provided for these controls.
When set to these positions, the frequency response of the system will be flat. Set
the controls to the customer’s satisfaction. Clockwise rotation increases (boosts)
the response and counterclockwise reduces (cuts) the response. Increasing bass
and/or treble can cause output signal peaks to increase. Check the PEAK LEVEL
indicator after making bass adjustment and lower the music input volume if excess
peaking occurs.
VOX (Voice Operated) SENS
The VOX SENSitivity control should be set so that only the desired signal is above
the threshold level, while noise or unwanted signal is below it.When an input signal
(such as voice) is detected, the music channel will be muted.To adjust the sensitivity
of this circuit:
1
) Rotate the control fully clockwise.While making a page announcement and talking
at a low level, the sound should not be choppy nor missing parts of words. If it is
choppy, or if intelligibility is poor, rotate the control counterclockwise to the point
where the sound is clear and crisp (but not to the maximum counterclockwise
position).
2) If the background music shuts down when no page is in progress, rotate the
control clockwise until the music is restored.
ALC
The ALC controls the level at which the amplifier will begin to limit the output signal
level.
Manual Output Adjustment Procedure (follow only if minor adjustments to the
reference settings are not adequate)
1
) Disable ALC by turning ALC control to the maximum counterclockwise position.
2) Make a page, speaking softly, yet distinctly. Set the TEL VOLUME control to the
desired paging level during this page.
3) Make another page speaking relatively loudly this time. Rotate the ALC control
clockwise, while making the page, until it has the same loudness as the first page.
NOTE: The TEL Volume and ALC controls work together to set the output level.
NOTE: The PEAK LEVEL indicator should not show excessive peaking during loud
pages. If this is occurring, the ALC control must be further increased.
