you might ask Zu (Sean) to make sure the impedance is correct for OTLs---as I recall, you can have this adjusted at the factory.
Zu speakers with Atma-Sphere M60 amplifiers
I own the latest version of the Atma-Sphere M60 amplifiers. Arriving soon are a pair of Zu Definition speakers. Does anyone here have any experience driving the Definitions with the Atma-Sphere M60 amps. Observations are most welcome. I am given to understand the Definitions are approximately 6 ohms. I'm hopeful this will still work satisfactorily.