Center 5.1 speakers not working [creative speakers] [sound card]

Q: Heres the problem .

The center channel of my Creative Speakers (5.1 Inspire 5300 only) when I work the Orange digital output sound card, disconnected from the Subwoofer / Center from my speakers. If I connect cable to my speakers, center channel not working – and when it works is very low in volume.

So the problem, I can not 5.1 . ie the center channel is independent of the left and right channels instead of playing the same thing. Otherwise, the channel is too low to h