Sony VAIO VGC-JS100 - Manual (Page 57)

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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.
Since your computer is capable of outputting digital signals through the OPTICAL OUT port, you can connect an S/PDIF
device such as digital headphones or an AV amplifier to the port and enhance the sound quality of your computer. For more
information, see the manual that came with your S/PDIF device.
!
To hear sound from the S/PDIF device connected to the OPTICAL OUT port, you need to change the sound output device. For the detailed instructions,
see How do I change the sound output device?
(page 125) .
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.