HP Notebook - Manual (Page 86)

Multimedia
Connecting an Audio Device
WARNING: To reduce the risk of personal injury, adjust the volume
before putting on headphones or a headset.
CAUTION: To prevent possible damage to an external device, do not
plug a monaural (single sound channel) plug into the audio-out jack.
The notebook has 2 audio jacks:
The microphone jack 1 connects an optional monaural or
stereo microphone. If a monaural microphone is connected,
the same information is recorded on both channels.
The audio-out jack 2, sometimes called a line-out jack,
connects headphones or powered external stereo speakers.
The audio-out jack is also used to connect the audio functions
of an audio/video device is also used to connect the audio
functions of an audio/video device to the audio-out jack:
Use only a 3.5-mm plug.
The internal speakers are disabled.
Identifying the audio jacks
6-4 Startup and Reference Guide––Part 2