Sony PCG-K415B User Manual page 59

Connecting the supplied external speakers to the audio port replicator
Connect the supplied external speakers to the audio* or A/V* port replicator attached to your computer.
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To use the supplied remote commander to control the volume, make sure to connect the USB cable from the left speaker to one of the USB connectors on the
audio* or A/V* port replicator.
Make sure to place the external speakers on a flat location with sufficient space to keep them from falling and dropping.
Do not grasp the depression on the front of the speaker to take hold of it.
* Depending on your model. See the printed Specifications sheet for more information.
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Using your VAIO computer