I wouldn't be surprised if that is the only one.
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Pani - Shielding is very important in digital cable because it prevents noise induced jitter and prevents reflections (that happen on impedance boundaries) by keeping proper characteristic impedance. Wire material is less important since at high speeds signal travels on the surface (skin effect) - therefore video cables are often silver plated.
I would caution against extrapolating from your experiences with interconnects that carry analog signals to the transmission of digital signals. The principles and effects that are involved are completely different, and I don't think there is any reason to expect that the behavior of different cable configurations that you observed with analog signals will carry over to digital cables.
Technically, I cannot talk much.
But there is some reason that I have written this post.
I have only learnt through observations and experiments. I would jot down some illustrations:
1. I have heard the Ridge Street Audio Poima Rv2 analog and digital interconnects. They are both made from silver (I guess similar conductors) and they both sounded similar. Somewhat dry with some silvery haze.
2. I also had a pair of ASI liveline analog interconnects.
They are a mix of many metals (Copper, Silver, Gold etc). For those who do not know, ASI uses the exact same interconnect for both their analog and digital offering.
So I have heard them as analog IC as well used them as digital IC. Both of them clearly sounded as if cut from the same sonic cloth. Very detailed, live, somewhat forward with a sparkling top end. It was too hot for my taste.
3. I have also heard the Yamamura Millenium 5000 and 6000 analog and digital interconnects. These are made of high purity copper. Undoubtedly they have a very similar sound signature between their analog and digital ICs.
A very enchanting mid range with the most natural vocals, a tad rounded in the bass and smooth airy highs, with a huge soundstage presentation.
In all the above cases the digital and analog ICs were made up of same/similar material and they sounded almost alike. At least the signature sound was almost the same.
I dont deny there can be ICs which may sound very different in their digital and analog avatars but if I have to take a blind guess (without listening), I would vote for the fact that they would sound alike.
One of the challenges of trying to categorize how cables sound is that when we listen to cables we are listening to our entire system, including the signature of the room. Therefore, when one describes a cable as being too bright or forward, it could well be that cable is actually more neutral than one that is less bright. In other words, the more neutral the cable the more you hear the weaknesses or strengths of your system.
I have a very high resolution system and I found the Liveline cables to be fantastic as they are so neutral they let the strenghts of my system to come through uncolored.
Forward meaning, the images are upfront, it is closer to you than you would expect. Such a presentation can excite for the initial period but it never allows you to relax. Every system has a default soundstage perspective, from there on cables can either make it more laidback or upfront, the livelines did the later. It is a great tweak for a system which is a bit too laidback.