6
Explanation
Note
Univox PLS-X series is operational only if a loop cable is connected to the driver. Otherwise,
the Peak indicator is lit constantly as a warning.
All controls are regulated with a small screwdriver.
1. Input level control (In1-In3)
Each input can be set to correct input by appropriate single-turn potentiometer located on
the front panel.
2. Input level LEDs
The thee blue and single red LEDs indicate the signal level at the output of the pre-
amplifier.
To ensure the AGC function is optimised, the signal level should be set to 0dB with
maximum peaks re12dB, i.e. the 0dB LED should be lit most of the time during the
audio programme and the +12dB indicator should flicker occasionally.
3-4. Parametric MLC
The parametric metal loss control function enables system frequency response correction
in cases where the signal strength is strongly influenced by the surrounding metal. By
selecting an appropriate parametric curve, the installer can fine tune the frequency
response, compensating for the effects of different metal types and configurations.
Four options for parametric compensation can be selected: 2kHz, 1kHz, 500Hz and 100Hz.
The chosen curve sets the frequency at which the metal loss control starts to compensate.
The function is powerful, however, excessive compensation can lead to signal limiting in
the treble range. If signal limiting occurs, the red Peak LED (8) will illuminate indicating
that the signal is limited, i.e. the available voltage in the driver is insufficient to deliver a
constant current (voltage clipping).
