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Mix Outputs
The output of the mix bus is directed to the
"Main" fader and then to the "Main" 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.
TIP: ENGAGE THE PAD ON ANY UNUSED
INPUT AND TURN THE MICROPHONE
GAIN CONTROL TO MINIMUM TO REDUCE
NOISE AT THE MIXER OUTPUTS.
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
Main Fader
The "main" fader is located at the far right of
the front panel. This stereo fader has factory
adjusted balance trim circuitry to provide
accurate L/R balance.
LED Meters --- - Mix Outputs
The left and right mix outputs are equipped
with two-segment LED meters located to the
left of the main fader.
The green LED shows signal presence. The
intensity of the green LED varies with signal
level over a range of -8 dBu to +24 dBu. The
green LED reaches half brightness at an
output level of about +4 dBu, and is near full
brightness at +24 dBu.
The red LED is factory preset to illuminate at
an output level of precisely +24 dBu, but may
be adjusted to other levels between 20 dBu
and 29 dBu. The red LED is driven by a peak
detection and stretching circuit so that very
short transients can be observed.
The red LED is a warning indicator not a clip
indicator. The direct outputs have 5.5 dB of
remaining headroom when the red LED is just
illuminated.
.
Page 15
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