I don't want to beat a dead horse but I'm bugged.

Who would consider this a good frequency response?

It’s the Harman curve. Research showed this to be the frequency response for headphones the majority of people like best.

It’s curves like this (there are several variants) that headphone designs nowadays target. Maybe we should do something similar for Amps plus speakers.

Tone control is mostly stripped off of hight end amps, let alone the good old 'loudness' switch. A multiband equalizer is a very nice piece of equipment ... strangely enough seldom used in high end hifi. I wonder why?

I've listened to a lot of amps on a lot of different systems, and I would say that specs are probably less correlated with sound in the case of an amp than they are with virtually any other component on the system.

If someone put a gun to my head and said I had to pick a spec for an amp and make a purchase on that spec alone, I'd want to know its weight. That doesn't tell you a lot about it sound, but it tells you more than just about anything else you could name.

I just bought an amp here on Audiogon, and I couldn't tell you its power rating without googling it.

@rudyb 

You can't compare the frequency response of a headphone to speakers.

This is not magic nor am I trying to insist my reference for sound quality is an objective reference. I am very mindful of my own unique sensory perception, biases, preferences, and I allow others those same considerations. I simply don't understand why some have need to assign some reference sound quality based on present rather primitive measurement regime. Again, this is symptom of inherent authoritarian mindset.

I posted all reference to experiments that proved that Fourier transform cannot explain the hearing process which is non linear...

Many dac technology are based on this flawed assumptions ...

But deludedaudiophile never answered...

This is not magic nor am I trying to insist my reference for sound quality is an objective reference. I am very mindful of my own unique sensory perception, biases, preferences, and I allow others those same considerations. I simply don’t understand why some have need to assign some reference sound quality based on present rather primitive measurement regime. Again, this is symptom of inherent authoritarian mindset.