We must not confuse an unnatural timbre sound ( from many speakers right out of the box, milhorn is right here ) and the spatial information encoded in the recorded acoustics and destructed by crosstalk ...Choueiri BACCH filters is not multichannels , this is for sure another interesting debate ... But BACCH filters will also improve timbre perception and not only the spatial qualities, provided the right set of measures for ears and head are well done and provided that the room acoustics is optimal ....
Immersiveness or the way the listener envelopment (LV) is realized without being detrimental to the sound source width (ASW) is another very important characteristic of the sound experience as much as imaging and soundstage ...
Then redesigning speakers as milhorn did , or creating a multichannel system, so good it could be, is not enough ...I am with Dr. Choueiri articles about that ...
Timbre experience ask for more deep acoustical controls ....Choueri explain it well ...
I must specify that this is only my opinion ... I dont own the BACCH filters nor a multichannel system nor the Milhorn speakers ...