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SX-ST / SX-SV User Manual page 20
- if PRE fader is selected, the level can still be monitored even if the channel is turned Off ( Muted )
5.6 Channel Fader
The Stereo Input module is equipped with two VCA circuitries ( Voltage Controlled Amplifier ), one for each of
the L & R signal. The channel fader controls the L & R audio levels in a range from – infinite to +12dB by means
of a single DC voltage equally applied to both VCA's.
5.7 Balance Left – Right
The Balance knob also take part of the VCA circuitry. It balances the stereo signal between the odd ( Left ) and
the even ( Right ) sides of a mix bus pair by means of a DC voltage applied in an opposite way to the VCA's.
NOTE: the Balance also affects the AUX pairs 1/2 & 3/4 when selected Post Fader
5.8 Mix busses 1/2 to 7/8 assignments
The advanced routing selector switches are used to assign the stereo signal to the Mix busses per pair either
Pre Fader or Post Balance ( Post Balance being obviously post fader ! )
The SONOSAX SX-VT series are equipped with eight mix busses. Thus, Stereo channels can be assigned to any
pair of mix busses using the 8 switches to create up to 4 stereo groups using pairs 1/2 - 3/4 – 5/6 – 7/8.
Logically, if a stereo signal has been Mono mixed by using the MONO selector, then the Mono signal can be
assigned as such to any of the 8 mix busses.
The 3 positions switches of the routing selectors 1 to 8 are used to assign the mix busses either Pre Fader or
Post Balance as follow:
Switches 1 to 8 in Centre Position : OFF , no assignment
Switches 1-3-5-7 in Left position : assign the channel to Odd busses Post Balance
Switches 1-3-5-7 in Right position : assign the channel to Odd busses Pre Fader
Switches 2-4-6-8 in Right position : assign the channel to Even busses Post Balance
Switches 2-4-6-8 in Left position : assign the channel to Even busses Pre Fader
The two lines drawn either sides of the selector give a clear view of the Pre Fader / Post Balance assignment:
when the switches are set toward the drawn lines, corresponding busses are assigned Post Balance.
A good tip is to remember that, conventionally, Odd busses are defined as Left channels and Even buses are
defined as Right channel in a stereo group. Therefore, by setting Odd switches to the Left and Even switches to
the Right you logically assign the stereo busses Post Balance.
5.9 ON Push button
It turns all the mix bus sends ON or OFF (Mute). This function is absolutely noiseless and affects the mix
busses 1 to 8, the Pre and Post fader Aux Sends, and the channel solo.
NOTES: - While powering up the mixer, all channels are turned OFF by factory default. Channels can be
turned ON during power up by soldering jumper S10.
- For monitoring purposes, the PFL signal and Pre Fader level meter remain available even if the channel is
turned OFF ( Muted )
- The ON/OFF function can be controlled from an external device. ( optional on SX-VT only )
5.9.1 ON status LED
The LED lit ON to indicate the "ON" status of the input module (factory default).
NOTE: By implementing jumper S11, this Led will turn ON to indicate the OFF (or MUTE) status.
This status can be displayed on a remote control panel for a better global view. ( optional on SX-VT only)