Meaning will they pass a 5.1 DD signal to your preamp as well as the analog sigal? I saw some DVD-A discs and they say Dolby Digital on them. Do I have to have 5.1 inputs and will it downmix to stereo? Any music to suggest? I have a Technics AC-500D and HK AVP1 preamp. Will my JVC 723 work with these pieces? THanks!