Digital Link (SPDIF)- There are two ways to connect via digital, Optical cable or Digital Coax. You first have to find out what the receiver can take. The optical obviously needs to be a fiber optic cable. The coax should be a digital coaxial cable. Some say that a simple RCA will work, but I prefer not to gamble w/ my audio.

Hope that helps. These connections are necessary in order to get the DD or DTS signal to the reciever.