So it seems like an easy question. How to connect my surround sound Creative 5 speaker and 1 sub into my Imac. The 5 speakers are individually connected to the sub, the sub then has 3 x 3.5mm audio line outs (Pale orange, green + black). This has to some how connect to my 1 audio line in If i connect one of the cables then 2 of the corresponding speakers work.

Help (in laymans terms if possible please with links perhaps) ?