Portable Headphone AmplifierPHA-3

Charging the battery via an AC outlet

The battery can be charged via an AC outlet by using the recommended USB AC adaptor (AC-UD20) (sold separately). For details on the adaptor, refer to its operation manual.

  1. Rotate the power/volume knob counterclockwise until it clicks to turn off the headphone amplifier.

    The battery charges only when the headphone amplifier is off. Rotate the power/volume knob clockwise to turn on the headphone amplifier. Rotate it more to adjust the volume.

  2. Connect the DC IN 5V port of the headphone amplifier and the USB AC adaptor (AC-UD20) (sold separately) using the micro-USB cable (supplied), then connect the USB AC adaptor to an AC outlet.

    The POWER/CHG indicator lights up in red while the battery is being charged, and the indicator turns off when charging is completed.

    Charging is completed in about 6 hours.*

    If the battery is not charged properly, the POWER/CHG indicator will flash in red.

    * Time required for empty battery to recharge.

    Battery life*2

    Analog connection: Approx. 28 hours*2

    Digital (balanced) connection: Approx. 5 hours*2

    *2 when using the headphone amplifier at 1 mW + 1 mW output (24 Ω). Time may vary, depending on the immediate environment or conditions of use.

Note

  • The charge will continue for about 10 hours, then the timer function of the charge protection circuit will stop the charging. If you want to continue charging, disconnect and reconnect the micro-USB cable.
  • When the headphone amplifier had not been used for a long time, it may take a while for the POWER/CHG indicator to light up in red. In this case, do not disconnect the micro-USB cable from the headphone amplifier. Wait until the POWER/CHG indicator lights up in red.
  • Charge the battery in an ambient temperature between 5 °C to 35 °C. If you try to charge the battery outside this range, the POWER/CHG indicator may flash in red, but the battery may not be charged.
  • When the battery is full, the POWER/CHG indicator may not light up in red.
  • When storing the headphone amplifier for a long time, avoid a place subject to high temperatures. When storing the headphone amplifier for more than a year, charge the battery every six months to prevent over discharge.
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