Am using my M3's along with an (probably) ill-placed sub for my TV. But my audio-only system uses my M50's, purchased ...oh several months ago.
A handful of times switching from system to system, it has nearly caused my jaw to drop. Let me just say that the M50's are also not optimally placed due to my extremely small and cluttered room.
And yet: the M50's are, I would say, "instruments". They are like my 1959 acoustic guitar which is wonderfully dried out and light and just "hums". The M50's simply jump to life. They sing. They play. They are instruments.
ok that's all. I love them. Wish I had more time off to just sit and listen.
It's as if these speakers are alive, when fed the signal.
I don't know about math and cabinet formula, but these guys have it going on.
