I agree, absolutely, usually various version of speaker have had a new suffix ( 2a, 2ax, 2x, 4x, 4ax) but 6 in its various issues never had anything to say: "I' m a new version!" . So one can have in his hands a minimalist 6 ( european, only one capacitor for tweeter) or a much more complex 6 with a completely different xover. It could be ok, if they should sound similar, but unfortunately they don't.