My friend has a Sony DVP 735 & STRDB 1070 and he has the audio linked up via a standard RCA cord via the Digital Coaxial output/input.. Now obviously this is not the preffered option, but I was wondering how much he is losing via this connection. I have listened to the system and it sounds great. How much better is the sound from a digital cable 1%, 10%, 50%, 100% ? What exactly is the phsyical difference is between a proper digital coxial and a standard CRA plug ? Thanks for you help.