It really depends on the music. When I first got my system, I flipped back and forth between 2.1 and 2.0 and found that there was no real difference for a lot of music because there is no content below 40Hz (Clapton unplugged was one I tested).
For my pipe organ disc, there is a definite difference.
I guess it also might depend on room.
I was listening to Simply Red "Picture Book" and the last song on the cd really shows the dynamic range of these speakers with 2.0 .
The kick drum was hitting me in the chest which i love as being a drummer.
