Acer Aspire 5920G - Manual (Page 57)

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Audio
The computer comes with 32-bit Intel High-Definition audio, and Dolby
®
certified surround sound system with two built-in stereo speakers and one
subwoofer supporting low-frequency effects enhancement.
Adjusting the volume
Adjusting the volume on the computer is as easy as scrolling unlimited volume
control wheel on the front panel.