Hats off to John Atkinson!
Thanks for the comparing Simaudio Moon Evolution P7 to Mark Levinson No.380S, Ayre KX-R and Parasound Halo JC 2. I am not nitpicking here but still the comparison was a tiny tiny bit incomplete.
Although I understand that no component is absolutely neutral especially when all components in a system interact with each other to impart a sound. Nonetheless, a reviewer of your experience can still identify the absolute character of each component by isolating the effect of other components by only changing one variable at a time.
From the review I got the impression that in absolute sense, Mark Levinson No.380S is little dark than absolute neutral, Parasound Halo JC 2 is little bright than absolute neutral and Simaudio Moon Evolution P7 hangs in between but leaning more toward JC 2. What is the absolute neutral for preamplifier for you? Your memory of live recordings that you did or another preamplifier (say Ayre KX-R for which you gave an impression that it was another class)?