Sub & fader adjustments?
 

How can I adjust front & rear fader, also can I adjust subwoofer level on the bose system on my 1998 sl 500? I see nothing in maual. Thanks John

radio controls
 

On my 1999 Sl500 these are the instructions:

8
Treble
Press the AUD key repeatedly until “TREBLE” appears in the display.
Press the "+" key to increase or the "-" key to decrease the level.
Fader*
Press the AUD key repeatedly until “FADER” appears on the display. (*not available on all models)
Press the "R" key to move the sound to the rear speakers or the "F" key to move the sound to the front
speakers.
Balance
Press the AUD key repeatedly until "BALANCE" appears in the display.
Press the "L" key to move the sound to the left speaker or the "R" key to move the sound to the right
speaker.
Centering all audio functions
Push and hold down the "AUD" key. All audio functions (bass, treble, balance and fader) are set to center
or flat positions, and the volume is adjusted to a pre-set level.
Radiomode
Selecting radio mode
Press button.
RESET
FM1 TREBLE
....|....
<- AUD +>
BALANCE
....|....
<L AUD R>
FADER
....|....
<F AUD R>