I connected my DVD player's audio to a Denon Dolby Digital receiver by connecting a cable from the coax audio out on the DVD player to coax audio in on the receiver. Simple enough. However, I used a regular cable with RCA type ends instead of a special coax cable. The receiver indicates it's receiving and playing a dolby digital signal and I am getting nice sound out of all 5.1 channels. So my question is, is a dedicated (or should I say expensive) coax cable really necessary or will a simple RCA type cable do the same job, as it appears to be doing in my set-up? Maybe some receivers are better able to pick up the DD signal without super-duper coax cable than others? Am I missing something? Thanks in advance to any and all who respond with their pearls of wisdom.