Imaging and the speakers "disappearing" aren't necessarily the same thing in my book - my Spica TC60s produced holographic images with small scale music but on large scale classical or rock - anytime they were pressed - they got congested and sounded like box-like indeed. Any decent speaker, placed correctly, should surely be able to image outside the box.
If we're just talking speakers that are actually "boxes" but disappear I'd certainly have to second various Alon/Nola speakers as well as ProAcs, Audio Physics, Ohms, Shahinians, Rockports...sure I'm forgetting some. Notice that many of these are dipoles or omnipolars.
Of course, then you have the planars and stats - the BIG Maggies, Quads, Sound Labs, Apogees which are not boxes and don't sound like it. Hooray!
Electronics and speaker placement are key to getting most box speakers to disappear.
If we're just talking speakers that are actually "boxes" but disappear I'd certainly have to second various Alon/Nola speakers as well as ProAcs, Audio Physics, Ohms, Shahinians, Rockports...sure I'm forgetting some. Notice that many of these are dipoles or omnipolars.
Of course, then you have the planars and stats - the BIG Maggies, Quads, Sound Labs, Apogees which are not boxes and don't sound like it. Hooray!
Electronics and speaker placement are key to getting most box speakers to disappear.