Magnapan mmg.
I had my system in my treated and dedicated room. Using heavy modified speakers with ALL better parts custom made point to point mounted and so on.
I got the tip that if you buy a second pair HiFi Speakers then it is a good idea that they are if a different type then the ones I currently have.
The idea is that the sound difference might be a greater contrast. Than just buying yet another "box" speaker that is same same but different..
In came dipole magnapan mmg second hand that were ~40 years old (uncommon speaker in my part of the world)
I put them up it took me less than a song and I just go "Wow i thought that I HAD HiFi but those magnapan showed me that it were not the case. (The box speaker went into the closet and yes I have two OB 18" for bottom end in the system).