Uconnect 8.4A Owner's Manual Supplement page 159

158 Uconnect® 8.4AN
Balance/Fade
Touch the Balance/Fade soft-key to Balance audio between
the front speakers or fade the audio between the rear and
front speakers.
Touching the Front, Rear, Left, or Right soft-keys or touch
and drag the blue Speaker Icon to adjust the Balance/Fade.
Equalizer
Touch the Equalizer soft-key to activate the Equalizer
screen.
Touch the + or - soft-keys, or by touching and dragging
over the level bar for each of the equalizer bands. The
level value, which spans between ±9, is displayed at the
bottom of each of the Bands.