How can I connect 2.1 speakers to 7.1 sound card?

[Guest]

I've got SG Audigy ZS [7400] (7.1) sound card but I want to connect Logitech LS21 (2.1) speaker system. Can I do this? If so, how?
Thanks

 

[JAYDEEJOHN]

Use front left and right, then use your sub to sub. Leave the rest
Make sure youre using 2.1 on your card as well