While not wanting to be argumentative, the Atma-Sphere M60 is not a good amp for the 4 ohm Maggies. 1- OTL amps don't like low impedance loads. 2- The M60's output at 4 ohms is not nearly enough to drive 1.7's to anything approaching reasonable SPL in even a moderately-sized room.
Ralph Karsten says he has owners of his amps pairing them with Maggies, but with an Anticables Autoformer between amp and speakers.