Alienware MJ-12 X2, User Manual

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As can be seen in the image above, there are four speaker settings:
Stereo headphones:
Only left and right channels are used.
Stereo speakers:
Uses left and right channels. When this mode is selected the Front Speaker
Location can be toggled between Close Together and Far Apart. Close Together
is optimized for two speakers that are close to the monitor. Far Apart optimizes
sound for speakers away from the monitor, such as a home stereo system. The
other speaker setup configurations don’t support this feature.
Quad Speakers (Multi-Drive Surround):
Uses left, right, back left and back right channels.
Surround Sound Speakers (5.1 Sound):
Uses left, right, center, back left and back right channels.
6.2.2 Virtual Theater Surround
This feature virtualizes multi-channel movie soundtracks on stereo speakers. Extra
virtual speakers are created to imitate a 4 or 5 speaker setup. This feature can be
enabled or disabled.
6.2.3 Acoustic Environments
The Acoustic Environment will simulate listening spaces where sounds and music are
played. Sound will be modified as if it was immersed into one of these environments.
The options to chose from are: None, Generic, Padded cell, Room, Bathroom, Living
room, Stone room, Auditorium, Concert hall, Cave, Arena, Hangar, Carpeted hallway,
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