I have the Atma Sphere and Quicksilver amplifiers and Merlin VSM loudspeakers. Both amplifiers surely work well, and which you would prefer depends on your own tastes. In a 15 X 25 room, the M60s do have enough power, but folks often go for more with the MA-1.
Anyway, a bit of a contrarian suggestion, but I'd keep your ARS Sonum. Though the other amplifiers make me happy, the ARS is a terrific amplifier in its own right, and outside of power, you really don't wrest improvement.
Anyway, a bit of a contrarian suggestion, but I'd keep your ARS Sonum. Though the other amplifiers make me happy, the ARS is a terrific amplifier in its own right, and outside of power, you really don't wrest improvement.