Headphone AmplifierPHA-3AC

Turning the power off

  1. Rotate the power/volume knob counterclockwise until it clicks.

    The POWER/CHG indicator turns off.


  • The headphone amplifier contains a rechargeable lithium-ion battery though the headphone amplifier can only be used when it is connected to an AC outlet with its DC IN 5V port via USB AC adaptor (supplied) and micro-USB cable (supplied). The rechargeable lithium-ion battery supports power supply from the USB AC adaptor and improves the sound quality. When the headphone amplifier is turned off, battery charging will start and the POWER/CHG indicator will turn up in red.