You are oh so right, Tom! If it measures better, it must be better.
Wellfed, I agree that the Zeroes allow one to use the Atmas, just feel that they seriously hurt the sound in the various cases me and a friend have tried them in. A buddy here loaned both of us a pair to play around with for a month. My friend's comment was that he wanted to try them as he felt very strongly a transformer was needed somehere in the audio chain. After playing around with two different pairs of speakers, I felt like I must have been a misfit, because these things destroyed what the Atmas were best at. Sheepishly telling him my experience after a few weeks, he immediately agreed, saying he came to the same conclusion. When we both let our lender friend know this, even he did not disagree.
My suggestions for someone interested in AtmaSphere: There are enough good speakers that mate well with the M60s to choose from, and if you insist on having one that doesn't, move up to a bigger AtmaSphere amplifier.