Connecting Speakers Directly to a Computer

[rsgros]

I have a dell optiplex 745, it has a sound card but I don't know where to hook the cables into. There are ports for, what I think are speaker cables but they are seem wrong for normal cables. Where can I find a operator's manual with pictures?

rsgros@embarqmail.com

 

[soundguruman]

the sound card hooks to an amplifier
the amplifier drives the speakers