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Control Room
Outputs
The output of the solo bus is directed to the
"monitor" fader and then to the headphone
and "control room" outputs.
Maximum output level is 29.5 dBu. All drivers
are high-current low-distortion amplifiers.
These are capable of driving loads as low as
300 Ohms without an increase in distortion.
Control Room Mute Switch
TIP: THE "CONTROL ROOM" OUTPUTS
CAN BE SET TO AUTOMATICALLY MUTE
WHENEVER A HEADPHONE IS INSERTED.
PRESS THE REAR-PANEL BUTTON TO
ENABLE THE AUTO-MUTE FUNCTION.
Driving Unbalanced Loads
CAUTION: ALWAYS LEAVE XLR PIN 3
FLOATING WHEN DRIVING UNBALANCED
LOADS.
XLR to RCA Wiring:
1. Connect XLR pin 2 (+) to RCA center pin.
2. Connect XLR pin 1 (GND) to RCA shield.
3. Make no connection to XLR pin 3 (-).
XLR to ¼" TS Wiring:
1. Connect XLR pin 2 (+) to Tip.
2. Connect XLR pin 1 (GND) to Sleeve.
3. Make no connection to XLR pin 3 (-).
PRE420 Instruction Manual – rev. E
Monitor Fader
The "monitor" fader is located to the right of
the solo buttons. It controls the output level
of the headphone jack and the balanced
control room outputs.
This stereo fader has factory-adjusted
balance trim circuitry to provide accurate L/R
balance.
Page 13
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