Dilemma here: The CD player arrives today so I was going through the Yam set-up app to add it. Turns out my Yamaha RX-A670 optical input is TV only! I am not using the optical at the moment because I use arc HDMI for the TV. So, my question is: will good RCA's sound as good as a digital optical input? Seems a shame to have an optical out and not being able to use it. Obviously, I know it will not be as good, but would the difference be so close as to not be decipherable? Or do I find another avr since it is important to me?