I have an optical cable going from my Time Warner DVR 8300 to my Harman Kardon reciever. I have not been able to get 5.1 sound when watching tv. I asked Time Warner if I need to make an adjustment to a menu and there response was, "You will use SPDIF coaxial which supports 5.1 digital sound". Am I missing something?? Shouldn't I be able to get 5.1 using optical cable? If not, what is the purpose of putting an optical connection on the cable box? Perhaps the person that responded from Time Warner does not know what they are talking about....