The single most significant variable in all of audiophilia is the speaker/room. It is an extremely complicated variable and the only way to understand it is to measure it. The performance variability in electronics is miniscule in comparison.
The next question is what are you going to do with speaker/room measurements. You have to have continuously variable control of amplitude and delay along with an understanding of acoustics and how to deal with unwanted additions by the room.
Power to you if you think you can do this by ear. The ear is best at appreciating the results and making adjustments to suite taste.