Connect iMac to 7.1 speakers? How?

[slffl]

I'd like to connect my 24" iMac to a 7.1 speaker setup I have from my PC. They are the Creative Inspire T7700, so they only have analog inputs for the speakers located on the subwoofer.

Does anyone have any suggestions on the best way to do this?

 

[KernalROM]

This is the best solution I could find for you...

http://www.griffintechnology.com/products/firewave

Bryan