Dear Gary,
The whole reason I got the KP100S and got rid of my JBL Eon10 G2 is that it is a stereo amplifier.
There are a lot of dynamics that don't come out in mono. At times, my PSR2000's piano sounds weird in mono because the stereo chorus effect causes a phasing sound.
The Barbetta sounds like an incredible speaker however, and I might check it out at some point in the future. It is mind boggling that they can pack so much power into such a light speaker.
Beakybird