Subaru 1998 Forester Owner's Manual page 128

The bass control has total of 13 volume levels (B: –6 for minimum, 0
for middle, B: +6 for maximum). Choose desired bass volume level by
turning the volume control knob. The control function returns to vol-
ume control mode after about 5 seconds.
B Treble control
Treble volume control indication
Select the Treble control mode by pressing the "T/B" button. In the
treble control mode, the display shows the indication as shown.
The treble control has total of 13 volume levels (TR: –6 for minimum, 0
for middle, TR: +6 for maximum). Choose desired treble volume level
by turning the volume control knob. The control function returns to vol-
ume control mode after about 5 seconds.
B Fader control
Fader control indication
5-6
When the treble volume level is set
at the level –6
HG0087
When the fader setting is at the F12
(front maximum and rear minimum)
HG0089
HG0088
HG0090