M-audio Duo USB User Manual download pdf (Page 11)

speakers, or a headphone amplifier, or to the inputs of a mixing console. Again,

check your device’s documentation for information on its operating line level,

and see the section, “Using the Input and Output Level Switches.” The Duo’s

S/PDIF Out can be connected to any S/PDIF capable device, such as a DAT or

MiniDisc with coaxial S/PDIF inputs.

The diagrams below illustrate two scenarios, intended as examples of how the

Duo might be used. Typical Setup #1 shows the Duo with a microphone plugged

into the Mic input on Channel 1, and an electric guitar with direct box plugged

into the Mic input on Channel 2. The main outputs (Line Out) of the Duo are

plugged into a monitoring system, with the S/PDIF Out connected to the S/PDIF

input of a DAT recorder (as you would if you were mixing down). Typical Setup

#2 shows a CD player plugged into the Line Input on Channels 1&2, with

Outputs 1/2 plugged into a monitoring system.

Using the Input and Output Level Switches

Using the front panel Input Level and/or the back panel Output Level switches,

you may change the operating line level for each of the Duo’s stereo pair Line

Level Inputs or Outputs. In the “out” position, the Duo is set to a +4dBu line

level. Pressing the input level switch and locking it to the “in” position changes

the operating line level to a -10dBV setting.

You can, in fact, have the input set to one line level and the output set to another,

depending on your needs. This will depend on the operating line level of the

device that is attached to that particular input or output. Your goal is to match the

Duo’s input or output line level to the line level of your source or target device.

Generally speaking, a device that runs at a -10dB line level will have outputs or

inputs that are single conductor with a ground, such as RCA jacks, or 1/4”

tip-sleeve phone jacks. Devices that run at a +4dB line level will have outputs or

inputs that are two conductor with a ground, such as XLR or 1/4” tip-ring-sleeve

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M-audio Duo USB User Manual Page 11