Chapter 2: PRE Hardware Overview and Stand-Alone Operation
11
The output trims are factory-calibrated so that
the clip point of the PRE output amplifier
matches the factory-set clip point of the 192 I/O
analog input. The PRE’s output level is –6 dBu
below its maximum output of +28 dBu
(+22 dBu). If you do not intend to use a 192 I/O,
you should wind the trims all the way up (clock-
wise) to allow for maximum signal output
(+28 dBu) and maximum performance.
MIDI In/Out/Thru Connectors
The MIDI connectors on PRE accept standard 5-
pin MIDI cables.
The MIDI In connector accepts MIDI input for
remote control of PRE (for example, from the
MIDI out of a MIDI interface in a Pro Tools sys-
tem).
The MIDI Out connector sends MIDI data out of
the PRE to the MIDI input of a Pro Tools system,
or another PRE. To daisy-chain multiple PREs,
connect the MIDI Out of one PRE to the MIDI In
of the next PRE, and so on. You will also need to
set each unit to a unique MIDI channel number
(refer to “MIDI Connections” on page 16).
The MIDI Thru connector is not used for
Pro Tools remote control.
Oscillator (OSC) Output
This is a balanced 1/4˝ TRS jack that outputs a
fixed oscillator signal (+4 dBu reference signal at
approximately 1 kHz) for calibrating the inputs
of gear not connected through the DB-25 out-
put. For more information, see “OSC (Oscillator)
Switch and LED” on page 6.
Calibration can change with temperature. The
output is nominally +4 dBu, but may vary up to
± 0.3 dB depending upon the ambient tempera-
ture inside of PRE. Allow the unit to heat up and
thus stabilize the oscillator output before using
the output for calibration purposes.
AC Power
This connector accepts a standard AC power ca-
ble (included). PRE is auto power-selecting
(100V to 240V) and will automatically work
with a standard modular cable to connect to AC
power receptacles in any country.
Power Up Defaults
When you first power on PRE, it has the follow-
ing settings.
User Settings Stored in Memory
When PRE is powered down, it remembers its
last settings. When the unit is powered back on,
the last settings will be intact.
Using PRE in Stand-Alone
Mode
PRE can be used without Pro Tools as a stand-
alone microphone preamplifier. PRE stand-
alone operation requires power and audio con-
nections.
The Send jacks and the DB-25 connector
both use the output Trim calibration pots
for adjustment. Calibrating a DB-25 output
will affect the Send output level as well.
Power Up Defaults
Function Status
Operation
Mode
Stand-alone (Remote “Lock-Out”
LED off)
Peak Hold Off
OSC Off
Shift Off
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