I often see pairs of amplified speakers sold for little more than 10 dollars. They have pretty good sound and are usually enough for my small living room. I have a computer with both spdif jacks and the standard 5 port black, orange, 2 green and red ports for my 5.1 sound card on my mobo. Right now I have a powered 2.1 setup, and 2 pair of powered speakers.

My question: is it possible to hook these up to the pc to get a 5.1 configuration? Would I need some other kinds of cables? I realize that it would not be an optimal solution.