Rotary Servo Sub Enclosure (Cyclone)

[mbcouple]

I have a pair of the old Phoneix Gold Cylone rotary motion servo subs that are begging to become primary home theater LFE drivers. My question is on enclosure theory for these non-traditional drivers. I was considering tube loading them in a 12" concrete forming tube. Would there be any benefit, or is it even possible, to horn load a driver like this? The driver extends down to 11hz, and is supposed to be crossed no higher than 60hz with an 18db crossover.
Thanks
Hans

 

[Volenti]

You're limited to an infinite baffle application or a large sealed enclosure (at least 4-5cuft for each) for these, they don't like too much back pressure, it leaks past the vanes and sounds nasty, ruling out vented, TL, horn loading ect.