What is the sonic impact of using analog interconnects (RCA) to run digital signals (SPDIF)? Can anyone illuminate?
Good digital interconnects are 75 ohm imped. with little variation, b/c even a small variation will sound lousy. Analog interconnects aren't built to the same tolerances, so may not sound good as digital inteconnects. Bottom line: digital cables are fine for analogue, analogue cables aren't so good for digital.
A good explanation of all this can be found at the http://www.bluejeanscable.com/articles/index.htm
What Anonymous says is true, but some interconnects designed for analog sound fabulous as a digital cable just by chance (AudioQuest Diamond comes to mind).
Does anyone have any experience using analog Valhalla interconnects for digital?
I don't, but Nordost makes a digital Valhalla, iirc.