What makes a "Midrange Driver" a Mid Range?

The rectangular planar driver has completely different directivity from a circular cone driver, so that may be a factor in how it sounds different.

I based this statement, because, based on my small, directivity study, a rectangular ribbon ALWAYS has a different directivity to a dome tweeter.

I avoid trying to describe how it sounds because describing it is like describing wine or chocolate- unless we can come to an agreement of what we mean, we are just using flowery language to try to convey what we mean...
 
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I'm not quite sure how to translate this description into perceived effects.. but knowing that cone drivers are capable of proper reproduction if used properly I can only advise against jumping to conclusions.
Try a planar mid some time. It is different. More different than any of the different drivers I have used. Hearing it was like the first time I heard a proper subwoofer in high school. Like an "oh, thats what it should actually sound like" sort of thing.