I am aware of several speakers that people say produce an image "free of the box": Green Mountain Audio Continuum, Ohm Acoustics Walsh, Reference 3a DiCapo.
I'd second Audiokinesis' vote for the Snell Type A. Not only "was an all-around superb loudspeaker in my opinion", but still is. Type A's can be found, you just have to look for them. I continue to enjoy mine.
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