Asus Xonar DX - Manual (Page 5)

5 ASUS Xonar DX Quick installation guide
English
1.4 Connecting audio device
1.4.2 Connecting analog speakers
2 Speakers
1.4.1 Back ports
Front Out
Side Surround
Center & Subwoofer
Back Surround
Line / Mic In
SPDIF Out
Front Out