I've listened to most of the speakers that is on your list: Revel Ultima's, MBL 101's, the entire Rockport line, Kharma Exquisite Midi/Reference/Grand Exquisite. They were all in different rooms, different electronics, etc.
I agree with above posters that to make a speaker disappear I think room acoustics play the most important role. I feel like the room acoustics play at least a 50+% role in how great the speakers sound and disappear.
I can see how you liked the MBL's. They do create a sense of space very unique to omnidirectional speakers. For me though, I felt the timber/tone of instruments to be less accurate than the othe speakers, like that of the Rockports, which were my favorite. The Kharma's were great until the ceramic midrange shattered on me (they now use a different midrange), and the Revel's are not in the same league as any of the above speakers in my opinion.
I agree with above posters that to make a speaker disappear I think room acoustics play the most important role. I feel like the room acoustics play at least a 50+% role in how great the speakers sound and disappear.
I can see how you liked the MBL's. They do create a sense of space very unique to omnidirectional speakers. For me though, I felt the timber/tone of instruments to be less accurate than the othe speakers, like that of the Rockports, which were my favorite. The Kharma's were great until the ceramic midrange shattered on me (they now use a different midrange), and the Revel's are not in the same league as any of the above speakers in my opinion.