09-20-12: KijankiHi Kijanki - My post was written playfully, not precisely. I agree with both you and Al that digital cables are the most demonstrable exception to the generalization that shorter cables are always better.
"I agree with Al that shorter cables are not always better"
He mentioned exception of digital cables related to timing of the reflections, but shorter analog cables should always be better. I've never heard of anybody claiming improvement with longer analog audio cable, other than salesmen trying to find excuse to sell more common longer cable (1m vs. 0.75m or 0.5m IC) that he has in stock.
Having said that, there may be other exceptions, though they are either controversial, system specific, or semantic...
The controversial: Some folks claim that longer power cables can result in better SQ. The explanation typically offered attributes the improvement to reduced "reflections." That may be nonsense, I'm not technically competent enough to say.
The system specific: On a few occasions I've had cables that were so short that they created a "nest" of criss-crossing behind components. In those cases, I have sometimes opted for a longer cable to provide wider spacing between cables, which at least in theory, could result in less interference and therefore better SQ.
The semantic: The generalization that "Shorter cables are always better" might give a false impression that shorter cables are always AUDIBLY better than longer ones of otherwise equivalent design. I suspect that, for any specific design, there is a range of lengths which are sonically indistinguishable. This is particularly likely with balanced cables.
Bryon