Aston Martin DB 9 2010 Manual page 136

Bass - Level for Bass
Treble - Level for Treble
Fader - Balance between the front and rear speakers
Balance - Balance between the left and right speakers
Surround - Level for surround sound
Subwoofer - Level for subwoofer
Centre - Level for centre speaker
Surround - Level for surround sound
8.8
Setting the Surround Sound
Press MENU and navigate to the sound source menu <AM, FM, CD,
iPod, USB, AUX, SAT 1 or SAT 2 menu...> (Enter) <Audio Settings...>
(Enter) <Surround (AM, FM, CD, iPod, AUX, SAT 1 or SAT 2)...>
(Enter) Select <Dolby Pro-Logic II>, <3 Channel> or <Off> (Enter).
.
Press and hold BACK to return to the main display.
The symbol for Dolby Pro-Logic II is shown on the DISPLAY if <Dolby
Pro-Logic II> is selected. '3CH' is shown on the DISPLAY if <3
Channel> is selected.
<Off> means the system is in normal stereo mode.
Dolby Pro-Logic II is not available in Radio mode.
Equalizer
Fine adjustment of the sound from the speakers:
Press MENU and navigate to the sound source menu <AM, FM, CD,
iPod, USB, AUX, SAT 1 or SAT 2 menu...> (Enter) <Audio Settings...>
(Enter) <Equalizer...> (Enter).
Move the JOYSTICK left or right to set the level. Use the JOYSTICK
(up or down) to select the next frequency. Five frequencies can be
adjusted.
Press ENTER to save any changes and exit. Press BACK to exit without
saving any changes.