Audigy 2 plat w/ klipsch 5.1

I have a SB audigy 2 platinum and klipsch promedia 5.1 speakers. Question is do i use the analog connection (3 regular headpone wires not sure what the correct term for them is...green black orange coloring) straight from sound card or do i use a s/pdif to the promedia DD box that came with the speakers then from that to the speakers using the analog wires to speakers?

http://www.klipsch.com/products/di [...] d-5-1.aspx
http://www.klipsch.com/products/de [...] a-5-1.aspx

http://support.creative.com/kb/Sho [...] x?sid=2590

I dont choose to use the front panel on the sound card anymore dont really use it anymore.