I understand what you're saying, and what you want, but your reasoning is linear, and I think it is much more complex than you think. You still have to do it by ear, and frequency response is just one part of it.
Should an amp have a "personality"?
I currently have a SimAudio W-7 amp. If there is a word to describe its sound, it would be NEUTRALITY precisely capitalized. I mean it is neutral to a fault. It's NOT warm, or bright, or analytical, or sweet, or anything that might be misconstrued as a personality. It's just "IS". It has nothing that would offend me but nothing that is endearing either. I suppose some people may like this type of sound. I also have another SimAudio Moon W-3 amp, and although it is neutral, but it has a distinct personality of being slightly forward, slightly upfront and ultimately more interesting to listen to.
At this point, I am a bit disappointed what the W7 is not "FOR". I want its sound to be FOR something be it slightly warm, or forward, or a touch bright or something that is a bit interesting even if it is a flaw. It's like a politician who wouldn't say he's for something at the risk of offending his potential voters.
PASS Labs amps are known to be a bit warm in the bass along with all their class A type of sound just as tube amps but they somehow make music sings.
At this point, I am a bit disappointed what the W7 is not "FOR". I want its sound to be FOR something be it slightly warm, or forward, or a touch bright or something that is a bit interesting even if it is a flaw. It's like a politician who wouldn't say he's for something at the risk of offending his potential voters.
PASS Labs amps are known to be a bit warm in the bass along with all their class A type of sound just as tube amps but they somehow make music sings.