>With coax, a cheap RCA cable would do.
>SPDIF can be referred to both coax and optical out.
I don't think so, for example system my receiver has all three, I have my Digital TV box which has an S/PDIF out connected to my S/PDIF in on my receiver
I have my VCR which has RCA 5.1 surround connected to my RCA In.
and my DVD which has Optical out connected to my Optical in.
All three are different.
I understand what your saying but for us who have our systems connected to home theatre system for example now need to make sure that we have an optical in instead of s/pdif.
Luckily my second unit that's connected to my PC has both "actually three" RCA cables for 5.1 surround, a S/PDIF in and an Optical In but not all systems out there automatically have an Optical in. So those buying this board thinking to connect it to their system may be in for a surprise.