Sony PCG-SRX99 VAIO User Guide (primary manual) User Manual page 83

Notes on using external speakers

Make sure that the speakers you purchased are designed for computer use.
 Before you turn on the speakers, turn down the volume.
 Do not place floppy disks or other data disks on or near the speakers; the speakers' magnetic field may damage the
data on the disks.
See the manual supplied with your speakers for more information on their installation and use.
Page 83