M-Audio Duo, User Manual

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Back Panel:
1. 9V AC Power Jack: This power jack accepts a 9v AC 1 Amp 2.5mm power
supply. This power supply is included with your Duo, and ONLY the proper
supply should be used.
2. USB Connector: This jack accepts the device-end of a standard USB cable.
3. S/PDIF Out: This coaxial RCA digital audio output connector receives audio
from one of two sources. With the “Standalone” switch in the Out position,
the S/PDIF Out receives audio from the computer’s software outputs. With
the “Standalone” switch in the In position, S/PDIF Out receives audio from
the Mic or Line inputs of the Duo.
4. Line Outputs: These 1/4” TRS jacks, labeled “Outputs,” are the main outputs
for the Duo. Using a TRS (tip-ring-sleeve) 1/4” plug, the Duo will provide a
balanced line-level output. Using a TS (tip-sleeve) 1/4” plug, the outputs will
be unbalanced. The Line Outs receive audio from one of two sources. With the
“Standalone” switch in the Out position, the Line Outs receive audio from the
computer’s software outputs. With the “Standalone” switch in the In position,
the Line Outs receive audio from the Mic or Line inputs of the Duo.
5. Line Level Output Switch: This switch sets the operating line level for the Duo
Line Outs. In the ‘out’ position, the Duo Outputs 1 & 2 are set to +4dBu line
level operation. Pressing and locking this switch to the in position sets these
outputs to a -10dBV line level.
6. Line Inputs: These 1/4” jacks accept TS 1/4” plugs. These are line level
inputs, and generally will be connected to the outputs of a line level
instrument or preamp.
7. Mic Inputs: These are the balanced, low impedance microphone inputs to the
pre-amp channels. NOTE: When phantom power is engaged, power is sent to
BOTH of these channels. An XLR jack is disabled when an instrument is
plugged into the corresponding 1/4” jack.
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