Regarding the use of 60wpc amps (like the Atma-Sphere M-60s), my Druid pair performs very nicely with a pair of Dynaco MKIIIs (re-built and ammended). Overkill, perhaps, but it's like having horsepower under the hood you'll never need. I know, SET refinement in flea power suits some better and there is no point belaboring that.
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.