Ian(aka Ivan)it certainly was distressing when it appeared at first that dakkon was cheating on us and looking to a Russian manufacturer for a better speaker!
As to the possibility of using bigger and presumably much more expensive main speakers with ultra-low bass extension, as you point out, using separate subs for that purpose appears to be much more effective since they can be placed independently of the mains where the best locations for bass exist, which would rarely if ever be the same spots for best locating the mains.
