Sub-woofer for Cremona Auditor

I have the SF Cremona Auditors (with Cary SLI-80 F1, Cary 303-300 CD player, Nordost Blue Heavan cables)and I want to add a sub. I prefer a powered unit. My room is 14 by 15.5, with relatively high ceilings (about 10 feet). Recommendations?
The Auditor is very fast. Most subwoofers, even an REL, will sound slow and disintegrated by comparison. The Zu Method is efficient, way deep and fast enough to mate with an electrostatic. That would be my choice.