Digital cable v. standard interconnects

The digital is a 75ohm cable, whereas the RCA is something like 53 or 43ohms (I don't rememebr). Yes it matters to use the right one.

Ezmeralda is correct but all cable impedances are "nominal". In other words, they can vary with frequency.

You can actually use any interconnect as a "digital" cable. Since "digital" is basically an RF based signal, i would recommend something that is shielded. A simple twisted pair WILL work but it is also leaking ( more like "spraying" ) signal around the room. You will notice a difference in sound between cables when doing this if your system and hearing are up to the task. Sean
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Truly necessary, no. Recommended, YES.!

Van den Hul carbon cables are said to be usable as digital cables in their literature. I use the Second (shielded version) as interconnects. I tried one as a digital cable but much preferred my Cardas Lightning digital cable.