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hardware (Aureal 3-Dimensional?) A technology developed by
Aureal that delivers sound with a three-dimensional effect
through two speakers. Many modern sound cards and PC games
now support this feature.
A3D differs from the various forms of surround sound in that
it only requires two speakers, while surround sound typically
requires four or five. It is sometimes less convincing than
surround sound but is supposedly better in interactive
environments. For example, PC games in which sounds often
move from one speaker to another favour A3D, while
pre-recorded video favours surround sound.