Acer Aspire 6920G - Manual (Page 53)

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Audio
The system provides you whole new enthusiastic audio experience including
Acer PureZone with built-in stereo microphones featuring beam forming and
echo cancellation technologies. The computer also comes with 32-bit High
Definition (HD) Audio, and stereo speakers.
Tuba
The dedicated Tuba CineBass subwoofer pumps out earthshaking movie-house
audio. The innovative design integrates the subwoofer with the tube-style
hinge.
Acer PureZone
Acer PureZone technology supports Acoustic Echo Cancellation, Beam Forming
and Noise Suppression for pure sound recording. To set up your microphone,
run the Acer HD Audio Manager by double-clicking the Acer HD Audio
Manager icon in the system tray of your Windows system. The Acer HD Audio
Manager dialog box will pop up. Click the Microphone tab, and then click the
Microphone Effects tab. Select Beam Forming and Acoustic Echo Canellation to
set the microphone effect.
Note: Disable the beam forming to get the multi-sound source
input.