Help setting up speakers!

[gullducott]

After much thought, I finally think I understand your problem, but for clarity please answer the following questions.

1.) do you get sound out of the rear speakers at all? eg, when playing music or a game.

2.) is the diagram of your subwoofer?

3.) is your sound card only 2 channel i.e. left and right?

If the answe to all three is yes then I believe I know what the problem is.