To answer your direct question, yes the REF600 will drive the Magico A3, but I agree with Audio Troy's assessment regarding the dry sounding nature of the REF600 which may become more evident with the hyper detailed Magico.
Anyone here with Magico A3 driven by Bel Canto Ref600's?
Contemplating the A3's and would like to know if the REF600M will drive them properly. Currently using Martin Logan Montis and these aren't a great indication of what these amps can and will do.