I am trying to hook up Motorola digital cable box DCT2500 to my Marantz SR8300 receiver. I connected digital out of the DCT2500 (did not have optical out) to the digital in of the Marantz and it plays fine. THe only problem is that even when the program is listed on the TV as Dolby Digital, the receiver still shows getting just a PCM stream. Is there a setting in the digital cable box to enable digital output? I cannot find a manual for this thing on the web and the cable guy did not have it either.