Sony PHA-3 Help Manual page 64

Digitally broadcast sound may not be output from a Mac's USB port. In this case, connect the AUDIO IN/LINE OUT
jack of the headphone amplifier to the analog audio output of the Mac. For details on connections, see "Connecting to
an analog output device."
If you are listening to music too loudly, the battery may drain even if the DC IN 5V port of headphone amplifier is
connected to a Mac or an AC outlet.
Be careful not to trip over the connecting cable.
Related Topic
Installing "Hi-Res Audio Player" on a computer
Connecting to an analog output device
Compatible operating systems (Mac)
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