Chapter 2: Hardware Overview and Stand-Alone Operation 11
PRE Back Panel
PRE has the following back panel connectors:
Mic Inputs 1–8
These are balanced XLR jacks, with Pin 1 wired
ground, Pin 2 wired hot (or “+”), and Pin 3 wired
cold (or “–”).
Use these jacks for microphone connections or
for line level devices that support balanced XLR
connectors.
Line/Inst (Line Level/Instrument)
Inputs 1–8
These are balanced 1/4-inch TRS jacks, with Tip
wired hot (or “+”), Ring cold (“–”), and Sleeve
ground.
Unbalanced connections are supported with the
use of standard 1/4-inch mono phone plugs. If
using line inputs with balanced line level de-
vices, be sure to use balanced to balanced cables
to maximize performance.
DB-25 Outputs 1–8
This is a balanced DB-25 connector for line out-
puts 1–8. For pinouts, see Appendix B, “Pinout
Diagram for the PRE DB-25 Connector.”
This connector can also output a fixed oscillator
signal on each channel. For more information,
see “OSC (Oscillator) Switch and LED” on
page 6.
Send and Return Inserts 1–8
These are balanced 1/4-inch TRS Send and
1/4-inch TRS Return jacks, with Tip wired hot
(or “+”), Ring cold (“–”), and Sleeve ground. In-
sert send levels are post output trim.
Use these jacks for inserting external devices
such as compressors or equalizers in the audio
path before recording to disk. Sends can also be
used as line outputs; in this case, all front panel
controls will affect the signal, except Mute.
Return channels 1–8 can be bypassed from the
front panel, or through remote control.
PRE back panel
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