Volvo S80 Owner's Manual page 185

Dolby Surround Pro Logic II together with a
centre speaker in the dashboard offers a sound
experience very close to being there.
The normal left-right stereo channels are
divided into left-centre-right. In addition,
surround sound is produced by the rear
speakers. Dolby Surround Pro Logic II works
in CD mode. 3-channel stereo (3-CH) is
recommended for AM and FM radio transmis-
sions.
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To select Dolby Surround Pro Logic II Mode,
press " PL II". "PL II" is shown on the
display. "Dolby Pro Logic" is displayed. Press
OFF to return to 2-channel stereo.
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To select 3-channel stereo press "3-CH".
"3-CH" is displayed. Press OFF to return
to 2-channel stereo.