Sony PCG-GRX690P - Manual (Page 146)

VAIO Computer Quick Start
146
To connect active speakers or amplifiers to the computer
1 Plug the audio cable into the A/V OUT jack on the computer.
2 Plug the other end of the audio cable into the speaker or the amplifier.
Connecting Active Speakers or Amplifiers to the Port Replicator
Active speakers
LINE OUT jacks
or amplifiers
Audio cable
(not supplied)