Front Panel - Controls, Indicators

Input Gain Controls
Adjusts input gain levels. Gain is minimized (not turned off) at full
counter-clockwise setting. Gain control only affects analog input sources.
48 V Phantom Power Switch and LED
Toggles 48-volt phantom power for both microphone inputs. Phantom is
present only at the XLR microphone inputs. LED illuminates when phantom power
is applied.
Input Selection Switches
Selects the input connection type. The adjacent 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.
Input Level Meter
Calibrated in dB FS, the meter shows the input level of each channel
(analog inputs only).
Power LED
Illuminates when USBPre is connected to a computer and receiving power over
the USB port.
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 illuminates when MONO is selected. Audio from the PC
is unaffected.
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
monitored in the headphones. S/PDIF signal can be monitored after being
processed by the computer.
Headphone Volume Control
Adjusts overall headphone volume.
Side Panels - Connectors


Mic Inputs
Active-balanced XLR inputs accept low-impedance microphone level signals.
Line/DI Inputs
Dual function inputs. Accepts balanced line level signals when the front
panel switch is in LINE position. Accepts musical instrument inputs such as
guitar pick-ups and electronic keyboards when the front panel switch is in DI
position. Impedance changes automatically with front panel Selection Switches.
Tape Inputs
Accepts consumer level inputs such as CD, MiniDisc, DAT, and cassette
players via RCA connectors.
Headphone Outputs
3.5 mm and ¼-inch TRS stereo headphone outputs can drive low-impedance
headphones. Note: The USBPre can drive headphones to dangerously loud levels -
take caution when raising the headphone level.
PC Audio Output
Audio output to feed powered loudspeakers or consumer level DAT, MiniDisc,
and CD recorders. RCA connectors. Computer audio only. The Volume level from
this connection is controlled only by the PC and its software.
S/PDIF Input and Output
Coaxial digital input and output connectors (two channel). Input is
selected via the front panel input selection switch. S/PDIF output mirrors the
PC Audio Output signal.
USB Port
USB B Type connector, interconnection with the computer; provides all data
and power to the USBPre via USB bus powering.
Bottom Panel - Controls

Microphone Input Pad
15 dB pad for use with "hot" microphone inputs. Pad can be inserted per channel.
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