Lexus IS250 2006 Owner's Manual page 219

Sound qual-
ity mode
*
Bass
*
Mid-range
*
Treble
Front/rear
volume
balance
Left/right
volume
balance
Surround
(type B only)
*
: The sound quality level is adjusted individually in each AMFM or CD mode.
Surround (type B only)
■
When the surround mode is ON, the matrix 7.1 surround sound system provides a
realistic sound field.
Mode
Level
displayed
BAS -5 to 5
MID -5 to 5
TRE -5 to 5
FAd F7 to R7
BAL L7 to R7
SUR-
ON/OFF
ROUND
3-2. Using the audio system
Press  Press 
Low
Shifts to rear Shifts to front
Shifts to left Shifts to right
OFF
High
3
ON
201