...two pluggable ports for front firing drivers, two for the rear drivers.
Sorry I wasn't clear Brian... the pluggable ports are all for the front-firing woofers, which are each in their own separate chambers of different sizs to stagger the resonances and provide more tuning flexibility. The rear-firing woofer is in its own separate sealed chamber.
The front-firing array is a 16 ohm load, and the rear-firing array is likewise a 16 ohm load. So driving both arrays in parallel, we have an 8 ohm load.
The level control on the rear-firing array improves the adjustability for room acoustics and speaker placement.
What's the price on this system?
Twelve grand for the system, consisting to two Bienville mains, four-piece Swarm, and amplifier for the Swarm.
For a while I thought that this was the first speaker to incorporate a level-adjustable array of rear-firing drivers, but such is not the case. Sonus Faber's two top models, "The Sonus Faber" and the "Aida" (two hundred grand and one hundred twenty grand respectively) did it before me. Obviously I think the best way to implement the concept is with well-controlled radiation patterns.
The Sonus Faber Aida has been at Axpona in the past, and I hope it will be there this year, as it would be interesting to compare the different approaches.