Balanced Digital Cable (continued…)

There is a big improvement archived by the balanced digital cable with controlled impedance. I did not expect that significant difference, by modifying digital connection, but what happened was drastic, i.e. the accuracy of just 0s and 1s makes difference by improvement of the circuit that carries just 0 and 1 signals. Some people explain that by improvement of jitter.
However, there is another difference between digital and analog world, at least in my case. Analog circuit tends to change its sound over time as it ages, toward smother sound in most case, and that is clearly recognizable. In contrast, I cannot notice any “aging” in digital circuit, at least in my case.
The improvement is applying analog experience to the digital signal path, and the improved circuit also ages. I may expect “aging effect”, but what happens is different. I suspect that there should be some threshold of jitter that I can notice the difference.
If I have some time and funding to do the research, I would commit subjective test and statistical analysis on this topic. I am quite confident that there is significant difference in “aging effect” in analog circuit but not in digital circuit.

But, that is just a dream.