Front Panel - Controls, Indicators
User Guide and
Technical Information
page 8
SOUND DEVICES, LLC
1. Input Gain Controls
Adjusts input gain levels. Gain is minimized
(not turned off) at full counter-clockwise set-
ting. Gain control only affects analog input
sources.
2. 48V Phantom Power Switch and LED
Toggles 48-volt phantom power for both
microphone inputs. Phantom is present only
at the XLR microphone inputs. LED illumi-
nates when phantom power is applied.
3. Input Selection Switches
Selects the input connection type. The adja-
cent LED indicates selected input type. For
each input channel (1 or 2), a single input can
be selected - they do not get mixed together.
S/PDIF input is selected for both channels.
4. Input Level Meter
Calibrated in dB FS, the meter shows the
input level of each channel (analog inputs
only).
5. Power LED
Illuminates when USBPre is connected to a
computer and receiving power over the USB
port.
6. MONO Monitoring Switch
Toggles between mono and stereo monitoring
of analog input audio in the headphones only,
especially useful when multi-track recording
and recording from one input. Red LED illu-
minates when MONO is selected. Audio from
the PC is unaffected.
7. Mix Control
Selects the signal source to be monitored
in the headphones between analog source
audio (PRE) and computer audio (PC).
Listening to PRE audio allows zero latency
monitoring of analog recording sources. The
center position mixes monitoring of both
source and computer audio. The signal at the
PC Audio Output is unaffected by this control.
NOTE: S/PDIF digital inputs cannot be moni-
tored in the headphones. S/PDIF signal can
be monitored after being processed by the
computer.
8. Headphone Volume Control
Adjusts overall headphone volume.
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