The sound is low.
- Turn up the volume of the connected device.
- Turn up the volume of the headphone amplifier.
- When using high-impedance headphones, set the GAIN select switch to HIGH.
- Use headphones that have a stereo mini plug.
The headphone amplifier only supports headphones that have a stereo mini plug. If you use headphones/headsets with a remote control or microphone, there may be low sound or no sound.