M758LMR Mainboard User’s Manual
The Four Speaker System
The onboard Sound Pro audio system supports 2 wave channels
(front/rear) known as the 4 speaker system. If you are running
applications which use a DirectSound® 3D or A3D® audio
interface, your system can simulate realistic 3D sound through a 4
speaker setup. Follow the steps below to install a 4-speaker setup.
Speaker Installation
Connect the front two speakers to the Line Out jack on the audio
port extension bracket. Connect the rear two speakers to the Line
In/Rear jack on the audio port extension bracket. The original Line
In connection can be moved to the Aux jack.
Speaker Positions
Set up your speakers similar to the following figure to get the best
audio results.
Mixer Setup
There is a 4-speakers option in the Volume Control of the Mixer
when you are setting up the PCI Audio application. Click on the 4
SPK icon to enable this option. This means that the output to the
rear speakers is sent through the Line-in/Rear jack. In order to
avoid hardware conflicts,
DO NOT
enable this option when the
Line-in/Rear jack is connected with a line-in device.
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