Knghifi,
You stated, "I auditioned Atma-Sphere M-60 with Paul Speltz Zero-Autotransformer driving Acoustic Zen Crescendo. It sounds fantastic on less demanding material but overall had trouble controlling the speaker."
There are 3 or 4 levels of adjustment with the Zero-Autotransformers. Perhaps the level was not the correct one. Is that possible? I am puzzled about your lack of success with the Speltz. How did this control problem manifest itself in terms of SQ?
You stated, "I auditioned Atma-Sphere M-60 with Paul Speltz Zero-Autotransformer driving Acoustic Zen Crescendo. It sounds fantastic on less demanding material but overall had trouble controlling the speaker."
There are 3 or 4 levels of adjustment with the Zero-Autotransformers. Perhaps the level was not the correct one. Is that possible? I am puzzled about your lack of success with the Speltz. How did this control problem manifest itself in terms of SQ?