Double click on the Installer program. The Installer program installs all Duo
extensions, and installs the ASIO driver in a folder named “Duo ASIO”on
your desktop.
2. locate the program’s ASIO folder (it will be found within the program’s folder
on your Macintosh HD). Drag the ASIO driver (located in the “DUO ASIO”
folder created by the Installer) to that folder.
3. Properly shut down the computer.
4. Plug the Duo wall-wart into your wall receptacle and to the Duo 9vAC power
jack.
5. Connect the USB cable to your computer and the Duo. Power up the Duo,
then power up the computer.
For information on how to enable the Sound Manager to use the Duo, see the section
“The Duo and the Macintosh Sound Manager.” For further information on using
and configuring ASIO drivers, see the section “ASIO Operation on the Macintosh.”
Hooking up your USB Audio Duo
The Duo provides two line inputs and two line outputs. The Duo also provides a
S/PDIF digital output on a coaxial RCA connector, plus a Headphone Out on a
1/4” stereo TRS jack for monitoring with headphones.
Each 1/4” TRS Line Out jack will accept a +4dB balanced signal on 1/4” TRS
plugs (tip-ring-sleeve), or a -10dB unbalanced signal on 1/4” TS plugs
(tip-sleeve). Each of the Duo’s 1/4” TS “Direct In” jacks are unbalanced, and
will accept an unba4dBu or -10dBV signal on 1/4” TS plugs.
The Duo provides two microphone inputs on balanced XLR connectors. Either a
mic or a line input can be used on any one of the Duo’s input channels. When a
line input is in use, the corresponding mic input is disabled.
You may connect the output of a line level instrument such as an electronic keyboard,
instrument preamp, or the output of a CD player or similar line-level device to the Duo’s
Line Inputs, Channel 1 and Channel 2. Check your device’s documentation for information
on its operating line level (+4dBu balanced or -10dBV unbalanced), and see the section,
“Using the Input and Output Level Switches” in this manual for more information.
The Duo’s Mic Inputs, Channel 1 and Channel 2, accept balanced, low
impedance microphones. If your microphone is a condenser type that requires
phantom power, you may apply phantom power by engaging the phantom power
switch (see section, “Phantom Power”). An impedance transformer, such as an
active (i.e., powered) direct box or passive transformer with 1/4” female TS to
male XLR jacks can be used to connect electric or acoustic guitars or a high
impedance mic to the Duo’s microphone inputs.
You may connect the Duo’s two line level outputs to the stereo inputs of a
monitoring system (power amp and speakers, or a home stereo), powered
10
