I really do enjoy the sound of the Mp-1 mkIII, but I have found with my Gamut M250's (even set to 23 dB gain-low setting)that the Atma pre is at significantly elevated volumes at the first or second notch on the pre volume control.....often too low on one notch and too loud on the next notch...this can be frustrating when you're searching for a comfortable volume for a recording. Also I find the Mp-1 mkIII to be more "hum laden" than the ARC Ref 3 or VTL 7.5 driving the Gamut M250's. That said, I love the sonic attributes of the MP-1..even more frustrating!
I should mention that the Gamuts are near dead silent, as SS amps go.
I would appreciate any suggestions to enhance compatibility, as I have exhausted my ideas.
Brian