MSI 648M-IL User Manual page 25

SPDIF Bracket
SPDIFJack (optical)
SPDIF Jack (coaxial)
Connect to JSP2
Rear R/L CEN/SUB
Connect to Center/
Subwoofer speakers
Connect to Rear 2-channel
output speakers
Hardware Setup
Connect to PORT 1 (IEEE)
Port 1394
2-21