Interesting to hear his criteria and observations on amplifiers and speakers. They are pretty much consistent with what our own Amir does for this site if my notes were correct.
@amirm are there any of his amplifier or speaker criteria stand out as something you don't already have covered in your tests that are worth adding or affect your weighting? Much of what he said is consistent with your measurements and graphs already but thought I'd write down what I heard to get your feedback.
I heard but may have missed things about amplifier criteria:
1)must be powerful enough
2)overall distortion and noise levels levels should be low
3)no/low distortion beyond 2nd or 3rd order harmonics
4)distortion and harmonic mix is the same across all frequencies.
5)distortion and harmonic mix is the same across the entire power range.
6)overall the amplifier behaves consistently across it's rated power range and frequency range.
I heard but may have missed things about speaker criteria, which seemed like a combination of empirically distinct measurements and managing to optimize the entire mechanical system:
1)is on axis response flat. Is the first launch of the wave from the speaker accurate and consistent across the frequency range.
2) do they handle off axis response flat and first reflection flat and well managed.
3)does the manufacturer understand the limits and weaknesses of the speaker and adjust to them to optimize as best they can to compensate for those weaknesses.
4) Speakers that physically have to move less will produce less distortion.
5) temperature plays a role in the performance of a speaker and speaker components have an optimal temperature range and may need to warm up.
6)Distortion
7) Resonances
8)Port resonances
9)speaker modulation noise
10)resonance across the rated frequency band
11)physically bigger speakers can give you a larger soundstage/presentation, more bass, louder volume than smaller ones.