Creative Sound Blaster X-Fi User Manual page 53

For 7.1 channel speakers:
Notes
If you have a 5.1 channel or 7.1 channel speaker system, you can upmix
your stereo sources (for example, CD Audio, MP3, WMA, MIDI, and
Wave) to the respective channels by using X-Fi CMSS-3D technology. To
upmix, you need to enable the X-Fi CMSS-3D feature in Entertainment
Mode or Game Mode. For more information, refer to their respective
online Help.
Speaker component
1. Subwoofer
2. Front Left
3. Front Center
4. Front Right
5. Side Left
6. Side Right
7. Rear Left
Rear Right
8.