The sound quality is subjective, the specs do not. When I commented on the great improvement in the sound of my cheap tweaked KEF Q100 coaxial speakers, diyers do not believe it or do not want to believe it because it is subjective so it does not make sense to argue about it.
I had not read it. At that time I was more aware of other things: how to solve/reduce my very great problems at home: DC, high voltage, noise, RF/EMI interferences...
Your amplifiers meet the necessary conditions to have an excellent sound, it is the only thing I can say without having heard them.