I'm not sure if this is the proper forum for this question or not, but I'll ask it here anyway. If it needs to be moved to another forum, please do so. This seems really stupid to ask, but what is the technical explanation to the term AC-3 output? Is this another word for coaxial output? The reason I'm asking is because my Scientific Atlanta HD cable box has the AC-3 output and no optical out. I was thinking that it's just a coaxial output that inputs into the reciever. If this is not the case, how would I hook it up to my receiver so that I could take advantage of the Dolby digital output of the cable box? Am I right, or am I way off? Thanks guys.