very helpful, the information in these manuels are very detailed
Text excerpt from page 4 (click to view)
About the sub woofer unit Your VAIO Digital StudioÂ® computer is supplied with a sub woofer unit to enhance your systemâ€™s sound capability.
Sub woofer unit
Right side Left side Front panel
Port The port extends the low frequency response to extend the volume output of the sub woofer unit.
Power knob/volume control Rotate the knob clockwise to turn on the sub woofer unit. Volume is controlled by rotating the knob until the desired volume is reached. Rotate the knob counter-clockwise to turn off the sub woofer unit.
Power indicator Light is green, while the power is on.
Speaker jack Connection for the speaker cable (RCA plug)*.
Sub woofer unit cable Connects the sub woofer unit to the computerâ€™s headphones jack.
AC power cord Connects the sub woofer unit to a grounded AC wall outlet or power strip.
* See the next section, â€śConnecting the computer, speakers, and sub woofer unitâ€ť for details on connecting the speakers to the sub woofer unit.