The plan is to to get 5.1 surround from an Amstrad Sky+ box to a Technics hifi with built-in dolby digital decoder. I was hoping to do this using an optical cable. The Sky+ box has an optical out, but the hifi doesn't have an optical connector - it only has phono inputs. I have limited knowledge of this, but it appears that if I connect Sky+ to hifi using a phono cable, the dolby digital signal is lost, and the sound is output in stereo. What is the solution to this problem? Do I need an optical cable with an optical to phono converter box? Any advice much appreciated. Thanks.