Portable Headphone AmplifierPHA-3

Connecting to a Mac

You can connect the headphone amplifier to a Mac using the micro-USB cable (supplied). The headphone amplifier is compatible with High-Resolution Audio format files, up to 384 kHz/32 bit PCM, DSD 2.8 MHz or DSD 5.6 MHz.

  1. Start your Mac.

    You need to download and install “Hi-Res Audio Player” on your Mac to play back High-Resolution Audio format files on the Mac with the headphone amplifier.

  2. Set the INPUT select switch to the position of the Xperia/WALKMAN/PC (USB AUDIO) connecting port (left edge position).
  3. Connect the Mac to the Xperia/WALKMAN/PC (USB AUDIO) connecting port using the micro-USB cable (supplied).


  • The headphone amplifier supports USB 2.0 (USB 2.0 High Speed) as an audio device.


  • If you are listening to music loudly with the headphone amplifier connected to a Mac, the POWER/CHG indicator may flash in green or the sound may be interrupted. This is not a malfunction. In this case, turn the volume down.
  • The headphone amplifier is not guaranteed to operate via a USB hub or USB cable extension. Use the supplied micro-USB cable only.
  • Do not disconnect the Mac while operating. Before disconnecting the Mac from the headphone amplifier, stop playback and turn the headphone amplifier off to prevent damage to data.
  • 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 computer.
  • Be careful not to trip over the connecting cable.