As usual, fantastic explanations from Al and Kijanki.
06-13-12: Mike60
What happens when you have reflections? What do you hear?
As Al mentioned, it's difficult to predict the exact audible effects of jitter for any particular system, though there do seem to be some typical effects.
I've had several opportunities to hear the effects of jitter in my system. A couple years ago, I added a reclocker (its raison d'ĂȘtre is to reduce jitter). Once or twice I reduced jitter accidentally, like when I replaced an unshielded ethernet cable with a shielded one. IME, hearing jitter is something that only happens when you REDUCE it. Anyway, here are some of its audible effects...
1. Reduced resolution
2. Shrillness in the highs
3. Fuzzy imaging
4. Unrealistic instrument timbres
5. Lack of pitch definition in the bass
I'm sure there are more effects, but those are the ones I've noticed in my system that I've attributed to jitter. Taken together, reducing jitter results in a sound that is less "digital."
Hope that helps.
Bryon