Art USBDI Stereo USB D/A Converter with Isolated Outputs - Manual (Page 8)

Ground Lift switch eliminates grounding loop hum. The switch adds another level
of hum protection. It lifts pin-1 on the XLR jacks. Computers sometimes are a
source for noise issues in audio setups.
OPERATION WITH A COMPUTER
Once the USB connection is made and your computer is on, your computer will
power the USB interfaces circuitry over the USB bus and the unit will automati-
cally connect and try to set your computer “Default Audio Device” to be “USB
Audio DAC”. Usually the computer will do this automatically whenever a USB
device is first connected, but it is sometimes necessary to make the selection
manually. The same settings may need to be made in your particular audio
application as well (Check your application instructions). These settings should
be made while the
USB-DI Project Series and computer are connected and
powered on.
Your computer audio output “Speaker” is now set to be the “USB Audio DAC” and
playback audio is routed to the
USB-DI Project Series . This must be done
while the USB-DI Project Series is connected to the computer and powered
on. After the above settings are made, your computer will automatically reconfig-
ure itself back to these settings every time the
USB-DI Project Series is
reconnected to the computer. Your recording software may also select which
inputs or outputs are being used.
NOTE : The USB-DI Project Series interface uses the standard “USB Audio
DAC”. This driver is built into most modern operating systems, including most
current versions of Linux. Since some details of how the audio interface is set
vary with different versions of Linux, the setup is beyond the scope of this docu-
ment. The main key in setup is to look for “USB Audio DAC” as the recording
source or playback monitor output while the
USB-DI Project Series is connect-
ed.
APPLICATIONS
Audio interfaces
Audio sources from computers, Audio projectors and any other USB audio
source to an analog audio interface, receivers, mixers and powered speakers.
When to use the Fixed versus the Variable switch
Monitoring the source signal. A separate headphone output allows you to moni-
tor the input signal, in the
FIXED mode. This will allow you to vary the output
signal for the headphones without changing the gain out the Main outputs.