X-fi to 5.1 amp connector?

[number41]

Whats the best method to connect an X-Fi to a 5.1 surround amp (normal hifi one) to obtain surround sound? Does the x-fi need a special optical cable or something? Bought an OEM x-fi and cant figure out how to do it the best way!

Thanks for any advice

 

[number41]

Amp has both digital coaxial and optical and normal analog. X-fi is the xtreme version so the cheap one!

 

[number41]

Double post