I think wire directionality is key. It influences the entropy of the data and can easily corrupt it. That's why NASA orders expensive directional cables for their infrastructure. Also power cords are important. Get the best possible, cannot be too thin:
https://www.extremetech.com/wp-content/uploads/2014/05/super-cable-2.jpg
The fuses- books can be written about them. Gold reference fuses are the minimum. The least important is the room acoustics, this can be easily improved with the carpet in front of the speakers.
https://www.extremetech.com/wp-content/uploads/2014/05/super-cable-2.jpg
The fuses- books can be written about them. Gold reference fuses are the minimum. The least important is the room acoustics, this can be easily improved with the carpet in front of the speakers.