Sony CDX-C90 Operating Instructions Manual page 56

Note
When you adjust the
volume all the way
down, "SUB W ATT"
appears and the cut-off
frequency of the
subwoofer is disabled.
EN
56
DSP
Adjusting the volume of the
subwoofer(s)
1
Follow the steps 1 through 2 of "Adjusting
the cut-off frequency of the subwoofer(s)"
(see page 55).
2
Press /, then VOL + or – to adjust the level.
D S P S o u n d T u n i n g M o d e
3
Press and hold SOUND for two seconds.
The normal display appears.
C D 1
SUB C.off125Hz
4
2 . 1 6
0