What are we objectivists missing?

To answer the OP post, all evidence suggests that under properly controlled conditions we do know how to measure audio signals in a way that accounts for the limits of human hearing. In uncontrolled, sighted settings there are a huge number of variables that change our overall perception of sound quality. Nevertheless, between any two models of speakers  it's easy to measure differences that fall within the known abilities of human hearing, often even between two speakers of the same make. There can be all kinds of interesting interactions between different components, such as amps and speakers, or even pre-amps and amps, and dacs and pre-amps, and even the cables used to connect them. This need not be the case, but it might be preferred to introduce audible non linear responses between these devices to give people room to tailor their sound by mixing and matching components. I believe that almost any speaker in any room can benefit from a little EQ - unless someone just hit the jackpot with the perfect match of room and speaker. Sometimes a little noise and distortion of the right kind can be nice too.

What are we objectivists missing?

The sound of music.

But the hills are alive with the sound of music. 

Henry Ford and Charles Lindbergh admired Hitler.

So did my concentration camp survivor father.

Objectively, Hitler took a country devastated after WWI and one of the worst states suffering from depression and brought it to a point where it almost took over the world. No such thing as “pure evil”. Or pure anything.

Thanks for these remarks...

Not less worst than Hitler are those who control money who financed his views nevermind his ideas about expelling jews and alleged "inferior" poeple and stole them of their right at first before deciding it is better to kill them...The bankers and corporations  without with there will never be no Hitler, no chemical to kills, etc....

No one is pure evil...You are right.. 

But a systenm can be pure evil .... Some political and economical system are born from pure evil... For exemple the mechanic of enslavement by debts... It is pure evil and pure economical catastrophy....We are free to participate to these systems or not....

It seems to escape people that in acoustic and psycho-acoustic, separating perceptive subjectivity and material objective conditions and measure make no sense at all...

It seems to escape some people that we dont listen to the gear, but to the gear/house/room/ speakers relation... Acoustic material dispositions and concepts being the first and last with psycho-acoustic factors to consider...Not the electronic design...

Incredibly some seems to not understand that and prefer to be charcterized by their obsession with their beloved gear branded name or against it, with a measuring tool and a blind test...

Many dont seems to understand that the only way to learn to listen is studying music and/or acoustic...

Picking 10 amplifiers or 100, and comparing them is ridiculous if someone pretend to know audio because of that...

it is more important to know how to embed the gear mechanically, acoustically and electrically than buying many amplifiers or upgrading......

The relation between subjectivity and objectivity is anyway ALWAYS an ongoing dynamical LEARNING  correlative process...