I don't know why this works - but it does...
I was pondering the construction of spdif cables, some of which can get quite complex, but it made me wonder why, especially when LAN cables contain just four twisted pairs and carry digital signals for much further than most spdif cables do.
So I decided to make a 1/2 meter spdif cable from a piece of CAT6 LAN cable.
I simply connected an RCA to each end of just one twisted pair
The RCA's were not the regular variety, but from the KLE Innovations Harmony line of RCA's that, due to their high impedance, do not suffer the same issues as conventional RCA's when used on digital cables.
What really surprised me was this cheapo cable's level of performance...
- it was considerably better than my Van den Hul spdif cable
- it even outperformed a very expensive spdif cable on loan
Dynamics were much faster, the image more spacious and focussed, the clarity makes the smallest details easily heard, and the venue acoustics were simply the most realistic I've ever experienced.
Granted, the rca's are not what I would call cheap - but CAT6 cable is.
The Copper Harmony will probably suffice for most applications
I used the Pure Harmony, but the Silver Harmony would probably guarantee excellent performance on the highest sample rates currently used.
Currently I'm streaming up to 24/192 and it's the best I ever heard my digital rig sound.
The cost - around $60 + cost of CAT6
Note: I do use WBT 4% silver solder
Give it a whirl :-)