warm digital cable

Seek warmth elsewhere.

I'd question whether any digital cable has a signature sound that is evident in general from application to application. Jitter is the one thing that can affect sound that can be attributed to a digital cable, and even in this case the actual results will vary from setup to setup. If you hear a difference fro one digital cable to another, I'd be willing to bet it is a result of jitter. I have no idea what characteristics of a digital cable could be used to determine whether the resulting sound is warm or not. Maybe certain jitter characteristics could translate to a "warmer" sound. But if so that is a not a good thing. Jitter is a form of distortion associated with the time dimension. You always want to minimize jitter for best sound, ie get the timing of the D/A process correct, not use it to flavor the sound.

MT,

You might hear a difference between two cables in any particular system but as Al points out, the results would likely not be reproducable consistently from system to system due to different jitter factors. So it does not seem likely that one could consistently attribute a particular sound with a particular digital cable.