Laptop to Parasound P6 Digital Input

What I learned these years for the source is that you never use usb port involved in your music system,it heavily hurt the sound, so leave the laptop away,you got choose different setup.

it doesn't look like your computer has an optical out, so you need a usb to optical converter, which you can get for as little as $25 on amazon

Thanks. 
I've chosen to go the Mini Mac/Audirvana/USB-to-USB route, as per Paul (PS Audio) McGowan's suggestion.