Have you tried the single Bose system and then compared it to the sound of two Bose systems in stereo?
I have tried both setups, and the difference is quite startling....actually more like an "ear-opening" experience...really made the Tyros3, the S900 and and even an old Roland E-86 spring to life, and to my ears, the improvement was more than the sum of the parts.
Ian, was this a Model 1 experience? As in, were you A/B'ing a Single Model 1, then a Double Model 1?