I have a hdtv cable box that outputs spdi/f coax digital out. I used a rca wire I had to hook it up to my reciever. The receiver displys that its getting a Dolby digital signal and audio sounds fine. I was wondering if a satandard RCA composite cable is the same as an spdi/f cable. My understaning of digital audio was that gold contacts dont matter since you cant really get noise with a digital signal. Am i correct? Is there a difference if a bought a cable that actually said spdif on the packaging. Thanks in advance.