Definition I pulled off the web for timbre:How the ear identifies and classifies sound. Example: the timbre of the same note played by two different instruments (flute and tuba) will not be the same
Let's say a trumpet plays through the VP100 then for some reason moves to the left speaker, the trumpet's notes may sound higher or lower pitched through the LR speakers than it does from the VP100.
Another example would be a voice that sounds clear and concise on the VP100 might end up coming through the LR main for a split second as the actor leaves the scene, the voice may not be as clear and concise(the reason I am sure you prefer the VP100 to your old center), this difference may or may not bother you. I know it bothers me when I hear it.
Usually sticking with the same manufacturer and speaker line across the front eliminates this mismatch in tone. Some people are irritated by this change in tone/timbre others not so much.
