Sony VGN-SR290JVB - Manual (Page 77)

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Using Peripheral Devices
Connecting External Speakers
You can connect external sound output devices (not supplied), such as speakers or headphones, to your computer.
To connect external speakers
1 Plug the speaker cable (1) (not supplied) into the headphones jack (2) i.
2 Plug the other end of the speaker cable to the external speaker (3).
3 Turn down the volume of the speakers before you turn them on.
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Make sure your speakers are designed for computer use.
!
Do not place floppy disks on the speakers. Their magnetic field may damage the data on the disks.