What do I need to achieve this. I have a Denon 3805 Amp and until the weekend had the two connected via a phono interconnect. I was under the impression if I got hold of a optical digital interconnect I would be able to run with Dolby Digital. However, I did this at the weekend, and I still can't select Dolby Digital on my Amp when watching Sky. Is there something I've missed? Have I even got the correct cable? The only other option seems to be digital coax (as well as the phono socket). Ta.