Foxconn 6514MR-ES - Manual (Page 9)

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After you finish the setting of jumpers and connect correct cables, power on the
system and press during POST (Power On Self Test) to enter the BIOS Setup
Utility. Choose “Load Optimized Defaults” for recommended optimal performance.
Please make sure your system components are good enough for optimized defaults.
12. Power on and Load Optimized Defaults
Select this option
and press .
11. Using 6-Channel Audio
The motherboard is equipped with the Realtek ALC655 chip, which provides
support for 6-Channel audio output, including 2 front, 2 rear, 1 center and 1
subwoofer channel. You need to install the driver for the Realtek ALC655 chip
before you can use the 4-/6-Channel audio function. Connect six speakers to
corresponding audio ports according to below figture and then select 6-channel
mode for 5.1 speaker output in Speaker Configuration in software.
Front Left Front Right
Rear Left Rear Right
Subwoofer
Center
Blue
Green
Red