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SX-ST / SX-SV User Manual page 16
4.12 Channel Power switch (SX-ST series only)
It powers ON or OFF the entire input module. This function is useful to save the battery power when only a few
numbers of channels are being used. An audible pop will be introduced in the mixer's outputs if this switch is
used during normal operation.
4.13 PFL/AFL push button
The P/A push button is used to monitor the channel signal Pre-Fader PFL or After-Fader AFL and to check its
level on the main level meters. A mode selector located on the Master/Monitoring Module let you choose
between the 3 operating modes of the P/A button: SOLO/AFL/PFL
NOTES:
- you can still monitor the PFL signal even if the channel is turned OFF ( Muted )
- Jumper S12 (L) and S13(R) determine whether the AFL is taken Pre or Post PAN pot
4.13.1 P/A LED
The P/A LED lights ON to indicate when the PFL/AFL push button is depressed. This LED is blinking to warn
you when the SOLO Mode is selected.
4.14 VCA's Group Selector (SX-VT Series with VCA input module only)
The SX-VT series can be equipped with VCA's Mic/Line Input module ( Voltage Controlled Amplifier ).
Thus, the channel fader do not control the audio modulation but, instead, a DC voltage that controls the VCA
circuitry.
This technology offers the possibility to build up an optional VCA grouping system of up to 8 independent
groups.
A VCA Group allows to use just one fader to control the global mix level of a large group of channels ( such as
drums, horns, backing vocals, etc.) and thus, providing an easier global control of that particular mix group.
The VCA Group Selector assigns the channel to one of the 8 VCA Groups. Each group is then controlled by a
Master Group Fader located on a Master Fader Module by means of a DC voltage.
NOTE: when position "0" or "9" is selected, the channel is disconnected from the VCA grouping system
4.15 Compressor (SX-VT series with VCA input module only)
This switch enables or disables the channel compressor. The compressor is used to limit the dynamic range of
the modulation. In case of extreme amplitudes or signal peaks, heavy distortion may occur, especially with
digital recording equipment. To avoid this kind of distortion or, for example, to avoid loudspeakers getting
damaged by overload, use the compressor. Compressors can also be used to change the sound of an
instrument by applying extreme settings. The principle function used in these devices is dependent on an
automatic gain control which reduces the amplitude of loud passages and therefore restricts the original
dynamics to a desired range.
4.15.1 Threshold
This control sets the threshold level for the compressor. It has a range of -30 to +infinity. Generally threshold
levels for compressors are set below the normal operating level to allow upper dynamics to be musically
compressed. For high ratio settings (limiter function), the threshold point is set above the normal operating level
in order to provide reliable signal limiting and thus, protects subsequent equipments.
4.15.2 Ratio
It controls the compression ratio between the input and output levels for all signals exceeding the threshold
point. The control range can be adjusted with the RATIO knob from a 1:1 ratio to an infinity:1 ratio.
4.15.3 Compressor LED
This Led will light ON only when the compressor becomes active and turns OFF when the compressor is
inactive, depending if the signal level is equal to or higher than the threshold point.