Thanks. Btw this was JR's response on my question regards difference in C500 between RCA and XLR..
"When RCA inputs are chosen, the negative polarity of the signal is connected to the input ground, in our components. Unlike many audio products,there is no addition or subtraction of circuitry in the Continuum regardless of which input is used. Therefore, single-ended signal transmission cannot be as good as balanced because the signal reference is ground, and ground will always be noisy and different throughout an audio system.
If you want to know more, you can read some of the info on our website. The above explanation is simplified, of course."