Your sound card should have a built in DAC and there should be an analog out on it.
If you only have digital/Optical output then you will need an external DAC to convert the Optical signal to analog. DAC's can run in any price range from moderiate to very expensive.
Some surround-recevers now have DAC's built into them where you can plug an optical cable directly into it and on the right input setting it should work. Some of these inputs are programable and may need to be set so you would have to check your manual on that.
Good Luck
If you only have digital/Optical output then you will need an external DAC to convert the Optical signal to analog. DAC's can run in any price range from moderiate to very expensive.
Some surround-recevers now have DAC's built into them where you can plug an optical cable directly into it and on the right input setting it should work. Some of these inputs are programable and may need to be set so you would have to check your manual on that.
Good Luck