depending on your computer you may have an optical toslink out on your 1/8 in headphone or line out jack. check with your sound settings and your manual. if you do have this just connect the toslink from the computer to the receiver. if not then the usb a to d is the way to go. if you just want a cable to do it you can use a stereo 1/8in to rca and take the signal out of the headphone jack, but this is the lowest quality of the options.