My guess is that B&Os room correction system is years ahead of Dirac - or any other comparable system:- 1. Mapping of known speaker sets and their individual performances 2. Decades of adaptive bass control 3. Directivity and sound steering 4. With the BL90, essentially noise-cancelling of opposing driver sets to narrow or widen the sound beam to minimise room reflections. Although not an expert, I would put Dirac capabilities similar to that of the BL5 in obtaining average room correction. BL5 was singing its stuff in 2003!  

Yes, but my point here is about using other speakers to improve the sound coming from a different speaker. I think Geoff mention something like this in the past for B&O, but Dirac launched it first?