Special note: When using the USB input with your computer; the dac25.3 and your computer should both be powered up. Your computer will recognize the new hardware and self install the necessary drivers.
Connect the USB cable to the dac25.3 from your computer prior to launching your audio player software: iTunes, Windows Media, Real Media, etc. If you haven't followed this instruction, close your audio player software, then
You will probably find that setting your audio player's and computer's volume to max will sound best.
Apple Computer Users:
With both your computer and the dac25.3 powered on; connect the USB cable.
Go to System Preferences 
Sound 
Output 
choose the USB Audio DAC for output. Close System Preferences. Launch iTunes.
Audio Out
To avoid damage to the dac25.3, make sure it is NOT plugged into an AC outlet while connecting up or disconnecting either of the audio outputs. The dac25.3 has two sets of fixed audio outputs on the back. One single ended set labeled RCA: R and L. And one balanced set labeled XLR: R and L. Connect the RCA or XLR audio outputs to the correct audio inputs on your integrated amplifier, preamplifier, or receiver.
The phones (headphone) output on the front is variable.
Connecting to the Mains - Plugging In
Check that the Power Switch on the front of the dac25.3 is in the off position. Look at the voltage selector slider on the back of the unit and confirm that it is set for the correct voltage: (~115V USA/~230V Europe). Push the plug (IEC line socket) of the power cable supplied with the dac25.3 into the socket AC IN on back of the unit. Make sure it is pressed in firmly. Plug the other end of the power cable into an AC wall outlet.
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