The SWARM overcomes the room modes in a way that provides bass fully comparable to what one hears in a good hall. The MRC cleans up any bass overhang, while leaving everything above 250 Hz untouched.
The Vandersteen Nine is a separate subwoofer that allows a four subwoofer "SWARM" when you consider the bass response of the Sevens that are used in the same system, and so Richard Vandersteen and John Atkinson are hearing and / or measuring the same benefits that Duke Le Juene has been talking about for YEARS. The SWARM neatly solves the hardest problem in audio - taming the room.
The good news is that one can get very close to the same sound quality with the combination of a pair of Quatro Wood CT's and an Audiokinesis SWARM (4-subwoofer array) for a LOT less money.....like over $60K less money. BTW, Robert E. Green (REG) wrote a great review of the Audiokinesis SWARM which explains all this better than I, for TAS last year. I suggest those who are curious about this should Google Robert's review.