Subaru 2006 Baja Owner's Manual page 185

Audio
Display Control mode
BAS Bass control
TRE Treble control
BAL Balance control
FAD Fader control
VOL Volume control
5-8
Turn counterclockwise
For less bass sound
For less treble sound
To increase left speaker volume and
decrease right speaker volume
To increase rear speaker volume and
decrease front speaker volume
For less volume
HS5014BA
Turn clockwise
For more bass sound
For more treble sound
To increase right speaker volume and
decrease left speaker volume
To increase front speaker volume and
decrease rear speaker volume
For more volume