Using The Audio-In (Microphone) Jack; Using The Audio-Out (Headphone) Jack - HP Compaq NC4000 Hardware And Software Manual

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Using the Audio-In (Microphone) Jack

The notebook is equipped with a stereo microphone jack.
When connecting a microphone to the microphone jack, use
a microphone with a 3.5-mm plug.
If you connect a stereo (dual-channel) microphone, stereo
sound will be recorded.
If you connect a monaural (single-channel) microphone,
left-channel sound will record on both channels.
If you connect a dynamic microphone, the recommended
sensitivity may not be achieved.
When an external microphone is connected to the notebook,
the notebook internal microphone is disabled.

Using the Audio-Out (Headphone) Jack

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WARNING: To reduce the risk of personal injury, adjust the volume
before putting on headphones or a headset.
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CAUTION: To prevent possible damage to an external device,
do not plug a single sound channel (monaural) connector into the
headphone jack.
The headphone jack is also used to connect the audio function
of an audio/video device such as a television or VCR.
When connecting a device to the headphone jack:
Use only a 3.5-mm stereo plug.
For best sound quality, use 24-ohm to 32-ohm headphones.
The notebook internal speakers are disabled when an
audio/video device is connected.
Hardware and Software Guide
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