Just wondering, does your Sony player have multi-channel RCA output, or just stereo. Also, as I remember it, when HDCD was launched it was seen as a competitor to SACD, and SACD prevailed. At any rate, if I were you, I would not pursue any sort of quest to have HDCD capability beyond what you already have. On the other hand, if you want to explore DSD sound consider multi-channel SACD, if the selection genres are to your liking. All you need to accommodate multi-channel SACD today is a modern Sony Universal Ultra Blu-ray Player and an AVR with HDMI input.