Volvo V70XC Cross country 1998 Owner's Manual page 251

1998 Volvo SV70
pg. 191 Dolby Prologic Surround Sound (certain models)
Dolby Prologic Surround Sound
Together with a center speaker mounted at the center of the dash, Dolby Prologic Surround Sound offers much clearer and more realistic sound.
Through a connection to a special decoder (optional on certain models), as well as a center speaker (option), the normal left-right stereo channels are divided into left-center-right. In addition, "surround" sound can be
created from the car's rear speakers.
Most modern discs are recorded so that vocals are heard in the center foreground, while the orchestra is heard across the entire left-right range, as well as from behind.
A- Engaging Surround Sound
Press the 'MODE' button to engage the center speaker and the surround unit. The mode selected will be displayed.
"3 CH" = center speaker also engaged.
"Dolby Prologic" = Dolby Prologic engaged with surround effect from rear speakers*.
B - Center speaker volume control
First pull the button out and then turn it to adjust the volume of the center speaker.
C - Surround effect volume control
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