Acer Aspire SA90 - Manual (Page 9)

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Speakers
For systems bundled with speakers, before powering on the system,
connect the speaker cable to the audio out (external speaker) port on
the back panel of the system.
For more detailed information about the speakers, please refer to the
included operating instructions.
Note: speakers are optional and the appearance might be
different depending on the actual product.
System upgrade
You can expand your AcerPower S Series system quickly and easily by
adding components. You can also upgrade the components of your
AcerPower S Series system.