Volvo S80 Owner's Manual page 173

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Set a suitable balance between the front and rear
loudspeakers by pressing out the button and
then turning it to the right (sound to front) or to
the left (sound to the rear). Centre position
means that the balance is "normalised". Press
the button back to its original position after
setting.
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Set the balance by pressing, pulling out the
button and turning to right or left. In the centre
position the volume is "normalised". Press the
button back to its original position after setting.
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There are two ways to select sound source:
Either with the shortcut keys (AM, FM
CD (HU-650/850), TAPE (HU-450)) or with
the SOURCE knob.
Turn the SOURCE knob to select FM or AM.
This knob can also be used to select
cassette (HU-450/650), CD (HU-650/850) or
CD changer (option) if connected.
The selected sound source is shown in the
display.
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