Good review, it answer many questions. I was really hoping to see a very positive review of this amp as I am currently planning a new HT room and want to run a seven channel class D setup. I had expressed concerns about some of the problems you raised in this post
Comment on A1400-8.
Before your review I had called Axiom to get better clarification about the 200W limit on protection and the thermal issues etc, but the answers provided were vague. As I understand it then the amps use an independent clock circuit which probably means it suffers the same output phase swings as all ICE powered amps. As far as I know only Nuforce and some Hypex based amps provide phase accurate output. I too was hoping the freq. response would be flatter.
The amp module design seems OK but the implementation of the complete product is poor, mechanics, protection, internal layout etc. I simply don't understand all those flying leads but could have overlooked it if the amp has little noise/hum problems... and while performance was good, the amp did not meet Axioms own SNR and power specs? One spec you did not mention was channel cross-talk. Can you provide this? Also did you try listening to a nearby FM receiver while the amp was running?
Sorry to say, unless Axion comes up with a cleaned up V2 real soon I will have to pass on this unit.