Sony VGN-A517M User Manual page 97

To connect the supplied external speakers
External speakers for VGN-A series models
1 Attach the computer to an A/V port replicator.
2 Plug the volume cable (1) of the speaker to the Volume jack on the port replicator.
3 Plug the speaker cables (2) to the Speaker jacks.
4 Plug the USB cable (3) to one of the USB ports.
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Using Peripheral Devices