Avid HD OMNI Preamp, I/O, and Monitoring Pro Tools HD Series Interface - Manual (Page 10)

HD OMNI Guide 6
CH1 and CH2 Inputs
The front panel Channel 1 (CH1) and Channel 2
(CH2) Inputs provide combined XLR and
1/4-inch TRS inputs for microphone and instru-
ment level input. Use XLR for microphone con-
nections and use 1/4-inch for instrument con-
nections.
Preamp Controls
The front panel Channel 1 and 2 inputs provide
high-quality Microphone and Instrument level
preamps. These two preamp channels can be
linked so that changing any parameter on either
channel causes an identical change to the other
preamp channel (this is useful for stereo
sources). When unlinked, the parameters for
each preamp can be set independently.
Input Type Lets you select MIC, LINE, or INST for
input on Channels 1 and 2. The corresponding
LED lights to indicate which option is selected.
When MIC is selected, the back panel MICRO-
PHONE inputs are used for channel 1 and 2 in-
put, unless an XLR cable is connected to the
front panel CH1 or CH2 inputs, then the front
panel connection is used. Remove the XLR cable
from the front panel connector to regain use of
the rear panel MIC connection.
When LINE is selected, the back panel LINE IN 1
and 2 1/4-inch TRS inputs are used.
When INST is selected, the front panel 1/4-inch
TRS inputs are used.
When Link 1 & 2 is disabled, the Input Type can
be independently enabled (or disabled) on
Channels 1 and 2 by pressing the PREAMP En-
coder to select the desired channel.
PAD Enables (or disables) a –20 dB pad for both
Channel 1 and Channel 2 inputs. The PAD but-
ton LED lights when the pad is enabled.
When Link 1 & 2 is disabled, PAD can be inde-
pendently enabled (or disabled) on Channels 1
and 2 by pressing the PREAMP Encoder to select
the desired channel.
48V Enables (or disables) 48V phantom power
for the Channel 1 and Channel 2 XLR inputs.
The 48V button LED lights when the phantom
power is enabled. You can manually enable or
disable the 48V option only when the Input
Type is set to MIC. When switching to another
Input Type (such as LINE), phantom power con-
tinues to be supplied to the MIC channel.
When Link 1 & 2 is disabled, 48V can be inde-
pendently enabled (or disabled) on Channels 1
and 2 by pressing the PREAMP Encoder to select
the desired channel.
CH 1 and CH 2 MIC/LINE/DI Inputs, and Preamp
controls
When the Input Type is set to LINE, the
PREAMP is bypassed. Also, the preamps for
the MIC/INST inputs do not change level
when LINE is selected, so you can easily re-
vert back to MIC or INST input.
When using the INST input with some
instruments (such as a guitar or bass),
you may want to engage the Pad to avoid
clipping on input.
Inserting or removing an XLR cable to or
from the front panel inputs automatically
disables phantom power (if it is on).