Amir limited argument apply only for ONE change...
In an incremental ongoing process of MULTIPLE ORIENTED changes like adding multiple devices to controls the mechanical, electrical and acoustical working dimensions of our audio system, and for the tuning process of our room/speakers, our own LEARNED biases and audio history are an advantage and a tool and they are also our perspective peripheral original vision who make us able to focus on some center of attention at will... It is not only an analytical habit it is ALSO a synthesis of our sound interpretative history : a learned set of biases...
All biases are not always bad and a spectral analyser always right...it is not so simplistic...Science is not playing with tools....It is conceptual and experimental...
Acoustic is the main matter in audio not electronic engineering...Sorry for those who dont know this elementary fact ....
Let Amir play with his tools and we will set or system/room like we will like to enjoy it for music...I buy nothing, never upgrade and create my own devices... And i am satisfied ....I dont need obsessed tools fanatics to teach me that adding a quartz crystal+shungite and copper on a cable is stupid... I know what my ears teach me....All my devices cost peanuts but my system dont sound like peanuts...
Why there is not GENERAL acoustic thread in audio forums save precise questions sometimes by some but no GENERAL acoustic thread... I started one and it goes dead in days....
I will say why?
It is because people like Amir and the so called subjectivist think that it is electronic engineering that gives to us sound experience... It is not even wrong.... For me it is IGNORANCE or a lie... It is acoustic and psycho-acoustic that explain sound and give us music and sound higher experience... Not upgrading with the advice of Amir or from a fan of a brand name product...
My best to all....
Perhaps A/B testing is a strawman argument, because the human brain is not a spectrum analyzer. We are too affected by our biases to come up with any valid data. Maybe.